Lines Matching +full:goldfish +full:- +full:pic
16 force -- enable ACPI if default was off
17 on -- enable ACPI but allow fallback to DT [arm64,riscv64]
18 off -- disable ACPI if default was on
19 noirq -- do not use ACPI for IRQ routing
20 strict -- Be less tolerant of platforms that are not
22 rsdt -- prefer RSDT over (default) XSDT
23 copy_dsdt -- copy DSDT to memory
24 nocmcff -- Disable firmware first mode for corrected
28 nospcr -- disable console in ACPI SPCR table as
45 If set to vendor, prefer vendor-specific driver
77 Documentation/firmware-guide/acpi/debug.rst for more information about
119 default in PIC mode
135 Format: <byte> or <bitmap-list>
138 Disable auto-serialization of AML methods
141 auto-serialization feature.
159 Ignore the ACPI-based watchdog interface (WDAT) and let
180 acpi_osi=! # disable all built-in OS vendor
182 acpi_osi=!! # enable all built-in OS vendor
244 For broken nForce2 BIOS resulting in XT-PIC timer.
253 as soon as the kernel's real-mode entry point is called.
291 See Documentation/sound/alsa-configuration.rst
298 align_va_addr= [X86-64]
303 CPU-intensive style benchmark, and it can vary highly in
306 32: only for 32-bit processes
307 64: only for 64-bit processes
308 on: enable for both 32- and 64-bit processes
309 off: disable for both 32- and 64-bit processes
319 Allow execve() of 32-bit applications and setting of the
321 subset of the CPUs support 32-bit EL0. When this
322 parameter is present, the set of CPUs supporting 32-bit
324 and hot-unplug operations may be restricted.
326 See Documentation/arch/arm64/asymmetric-32bit.rst for more
329 amd_iommu= [HW,X86-64]
332 fullflush - Deprecated, equivalent to iommu.strict=1
333 off - do not initialize any AMD IOMMU found in
335 force_isolation - Force device isolation for all
340 force_enable - Force enable the IOMMU on platforms known
343 pgtbl_v1 - Use v1 page table for DMA-API (Default).
344 pgtbl_v2 - Use v2 page table for DMA-API.
345 irtcachedis - Disable Interrupt Remapping Table (IRT) caching.
346 nohugepages - Limit page-sizes used for v1 page-tables
348 v2_pgsizes_only - Limit page-sizes used for v1 page-tables
352 amd_iommu_dump= [HW,X86-64]
358 amd_iommu_intr= [HW,X86-64]
361 legacy - Use legacy interrupt remapping mode.
362 vapic - Use virtual APIC mode, which allows IOMMU
364 This mode requires kvm-amd.avic=1.
393 Disable amd-pstate preferred core.
406 Power management functions (SPARCstation-4/5 + deriv.)
408 Disable APC CPU standby support. SPARCstation-Fox does
409 not play well with APC CPU idle - disable it if you have
412 apic [APIC,X86-64] Use IO-APIC. Default.
418 when initialising the APIC and IO-APIC components.
442 0 -- disable.
443 1 -- enable.
446 arcrimi= [HW,NET] ARCnet - "RIM I" (entirely mem-mapped) cards
497 audit= [KNL] Enable the audit sub-system
499 0 | off - kernel audit is disabled and can not be
501 unset - kernel audit is initialized but disabled and
503 1 | on - kernel audit is initialized and partially
516 0 - Disable the BAU.
517 1 - Enable the BAU.
518 unset - Disable the BAU.
557 See Documentation/block/cmdline-partition.rst
571 See Documentation/admin-guide/bootconfig.rst
576 bttv.pll= See Documentation/admin-guide/media/bttv.rst
585 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
604 inclusive. See arch/mips/include/asm/pgtable-bits.h
614 - foo isn't auto-mounted if you mount all cgroups in
616 - foo isn't visible as an individually mountable
618 - if foo is an optional feature then the feature is
624 Specifying "pressure" disables per-cgroup pressure
641 semi-legacy software can check this file to decide
650 nosocket -- Disable socket memory accounting.
651 nokmem -- Disable kernel memory accounting.
652 nobpf -- Disable BPF memory accounting.
657 0 -- check protection applied by kernel (includes
659 1 -- check protection requested by application.
671 numbers X. Note the Linux-specific bits are not necessarily
672 stable over kernel options, but the vendor-specific
692 force such clocks to be always-on nor does it reserve
696 information, see Documentation/driver-api/clk.rst.
698 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
715 [X86-32] pit,hpet,tsc;
722 [X86-64] hpet,tsc
728 architected timer so that code using WFE-based polling
742 clocksource-wdtest.holdoff= [KNL]
748 cma=nn[MG]@[start[MG][-end[MG]]]
759 Sets the size of kernel per-numa memory area for
761 per-numa CMA altogether. And If this option is not
763 With per-numa CMA enabled, DMA users on node nid will
790 com20020= [HW,NET] ARCnet - COM20020 chipset
794 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
798 ARCnet - COM90xx chipset (memory-mapped buffers)
827 See Documentation/admin-guide/serial-console.rst for more
842 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
843 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
856 Start an early, polled-mode console on the 8250/16550
859 MMIO inter-register address stride is either 8-bit
860 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
864 the h/w is not re-initialized.
891 syscall, or to executing "dmesg -S --raw" or to reading
915 disable the cpuidle sub-system
921 disable the cpufreq sub-system
929 [X86,EARLY] Delay for N microsec between assert and de-assert
950 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
958 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
961 See Documentation/admin-guide/kdump/kdump.rst for further details.
966 start-[end] where start and end are both
968 Documentation/admin-guide/kdump/kdump.rst for an example.
971 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
979 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
985 for 32-bit devices won't run out. Kernel would try to allocate
988 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
989 --> arm64: 128MiB
990 --> riscv: 128MiB
991 --> loongarch: 128MiB
1021 [KNL] Disable crypto self-tests
1029 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1044 See also Documentation/input/devices/joystick-parport.rst
1057 [KNL] verbose locking self-tests
1060 self-tests.
1062 (no extra messages), setting it to -1 (all bits set)
1063 will print _a_lot_ more information - normally only
1098 Format: { on, no-mount, off }
1100 no-mount:
1105 get a -EPERM as result when trying to register files
1109 Default value is set in build-time with a kernel configuration.
1121 Documentation/admin-guide/mm/hugetlbpage.rst.
1135 delayacct [KNL] Enable per-task delay accounting
1221 entries for DMA-API debugging code. One entry is
1222 required per DMA-API allocation. Use this if the
1223 DMA-API debugging code disables itself because the
1227 With this option the DMA-API debugging driver
1251 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1276 Control how the dt_cpu_ftrs device-tree binding is
1286 what data is available or for reverse-engineering.
1291 Documentation/admin-guide/dynamic-debug-howto.rst
1302 determined by stdout-path property in device tree's
1307 Start an early, polled-mode console on a Cadence
1318 Start an early, polled-mode console on the 8250/16550
1320 MMIO inter-register address stride is either 8-bit
1321 (mmio) or 32-bit (mmio32 or mmio32be).
1331 Start an early, polled-mode console on a pl011 serial
1335 the driver will use only 32-bit accessors to read/write
1344 Start an early, polled-mode console on a meson serial
1350 Start an early, polled-mode console on an msm serial
1356 Start an early, polled-mode console on an msm serial
1362 Start an early, polled-mode console on a serial port
1368 Start an early, polled-mode console on a serial port
1374 Use RISC-V SBI (Supervisor Binary Interface) for early
1392 Start an early, polled-mode console on a lantiq serial
1406 Start an early, polled-mode, output-only console on the
1411 Start an early, polled-mode console on the
1417 Start an early, polled-mode console on a Qualcomm
1425 coherent non-x86 systems that use system memory for
1528 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1545 elanfreq= [X86-32]
1553 See Documentation/admin-guide/kdump/kdump.rst for details.
1569 0 -- permissive (log only, no denials).
1570 1 -- enforcing (deny and log).
1603 See also Documentation/fault-injection/.
1607 See Documentation/admin-guide/sysctl/net.rst for
1611 See Documentation/admin-guide/blockdev/floppy.rst.
1613 forcepae [X86-32]
1620 fred= [X86-64]
1671 ftrace_filter=[function-list]
1673 tracer at boot up. function-list is a comma-separated
1678 ftrace_notrace=[function-list]
1680 function-list. This list can be changed at run time
1684 ftrace_graph_filter=[function-list]
1687 function-list is a comma-separated list of functions
1691 ftrace_graph_notrace=[function-list]
1693 function-list. This list is a comma-separated list of
1713 off -- Don't create device links from firmware info.
1714 permissive -- Create device links from firmware info
1717 on -- Create device links from firmware info and use it
1719 rpm -- Like "on", but also use to order runtime PM.
1732 strict -- Default. Continue waiting on consumers to
1734 timeout -- Give up waiting on consumers and call
1744 See also Documentation/input/devices/joystick-parport.rst
1748 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1774 gcov_persist= [GCOV] When non-zero (default), profiling data for
1780 goldfish [X86] Enable the goldfish android emulator platform.
1784 gpio-mockup.gpio_mockup_ranges
1787 gpio-mockup.gpio_mockup_named_lines
1819 against bounds-checking flaws in the kernel's
1827 [KNL] Should the hard-lockup detector generate
1843 auto - Hash pointers unless slab_debug is enabled.
1844 always - Always hash pointers (even if slab_debug is
1846 never - Never hash pointers. This option should only
1854 for 64-bit NUMA, off otherwise.
1862 corresponding firmware-first mode error processing
1872 during restoration read-only).
1916 hpet= [X86-32,HPET] option to control HPET usage
1933 number of pages to allocate per-node can be specified.
1934 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1945 Documentation/admin-guide/mm/hugetlbpage.rst.
1955 Note that this parameter only applies to non-gigantic huge pages.
1965 boot-time allocation of gigantic hugepages is skipped.
2000 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
2006 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
2028 Set device-properties for ACPI-enumerated I2C-attached
2029 touchscreen, to e.g. fix coordinates of upside-down
2037 Omit "=<val>" entirely Set a boolean device-property
2038 Unsigned number Set a u32 device-property
2039 Anything else Set a string device-property
2042 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
2043 touchscreen-inverted-y
2045 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
2046 touchscreen-size-y=1080:touchscreen-inverted-y:
2047 firmware-name=gsl1680-vendor-model.fw:silead,home-button
2052 (disabled by default, and as a pre-condition
2054 i8042.direct [HW] Put keyboard port into non-translated mode
2068 suspend-to-ram transitions, only during s2r
2092 -1 -- never invert brightness
2093 0 -- machine default
2094 1 -- force brightness inversion
2096 ia32_emulation= [X86-64]
2098 When true, allows loading 32-bit programs and executing 32-bit
2123 idle=nomwait: Disable mwait for CPU C-states
2151 legacy only accept legacy-NaN binaries, if supported
2153 2008 only accept 2008-NaN binaries, if supported
2164 'relaxed' straps the emulator for both legacy-NaN and
2165 2008-NaN, whereas 'strict' enables legacy-NaN only on
2174 Ignore loglevel setting - this will print /all/
2241 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2242 "ima-sigv2" }
2243 Default: "ima-ng"
2281 stuff: Deploy RSB-fill mitigation when retpoline is
2286 Documentation/admin-guide/hw-vuln/indirect-target-selection.rst
2297 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2298 initcall functions. Useful for debugging built-in
2343 0 -- basic integrity auditing messages. (Default)
2344 1 -- additional integrity auditing messages.
2372 could harm performance of some high-throughput
2381 1 to 9 specify maximum depth of C-state.
2390 algorithms for p-state selection. There are two
2391 P-state selection algorithms provided by
2394 on whether or not the hardware managed P-states
2401 used along with the hardware-managed P-states (HWP)
2405 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2406 instead of acpi-cpufreq may disable platform features, such
2408 P-States information being indicated to OSPM and therefore
2411 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2424 Allow per-logical-CPU P-State performance control limits using
2427 Do not enable capacity-aware scheduling (CAS) on
2430 intremap= [X86-64,Intel-IOMMU,EARLY]
2435 BIOS x2APIC opt-out request will be ignored
2478 AMD Gart HW IOMMU-specific options:
2497 Do scatter-gather (SG) merging. Implies "force"
2501 Don't do scatter-gather (SG) merging.
2514 0 - Try to allocate a 32-bit DMA address first, before
2516 1 - Allocate directly from the full usable range,
2518 greater than 32-bit addressing.
2522 0 - Lazy mode.
2528 1 - Strict mode.
2531 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2533 legacy driver-specific options takes precedence.
2538 0 - Use IOMMU translation for DMA.
2539 1 - Bypass the IOMMU for DMA.
2540 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2542 io7= [HW] IO7 for Marvel-based Alpha systems
2557 See Documentation/admin-guide/nfs/nfsroot.rst.
2593 Enables support for pseudo-NMIs in the kernel. This
2598 [RISC-V,EARLY]
2600 as IPIs. Intended for system where IMSIC is trap-n-emulated,
2619 [Deprecated - use cpusets instead]
2620 Format: [flag-list,]<cpu-list>
2653 "number of CPUs in system - 1".
2679 The format of <cpu-list> is described above.
2683 ivrs_ioapic [HW,X86-64]
2684 Provide an override to the IOAPIC-ID<->DEVICE-ID
2688 For example, to map IOAPIC-ID decimal 10 to
2694 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2697 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2701 ivrs_hpet [HW,X86-64]
2702 Provide an override to the HPET-ID<->DEVICE-ID
2706 For example, to map HPET-ID decimal 10 to
2712 * To map HPET-ID decimal 0 to PCI device 00:14.0
2715 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2719 ivrs_acpihid [HW,X86-64]
2720 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2724 For example, to map UART-HID:UID AMD0020:0 to
2730 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2733 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2757 the kernel for non-movable allocations. The requested
2767 subsystem. Note that allocations like PTEs-from-HighMem
2775 for non-movable allocations and remaining memory is used
2786 gdb or control-c on the dbgp connection. When
2787 not using this parameter you use sysrq-g to break into
2792 or a supported polling keyboard driver (non-usb).
2821 "0" | "off" | "n" - kexec handover is disabled
2822 "1" | "on" | "y" - kexec handover is enabled
2828 ranges that can only be used for non-kernel
2839 parameter defines the size of additional per-node
2844 Configure the RouterBoard 532 series on-chip
2847 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2853 kprobe_event=[probe-list]
2855 The probe-list is a semicolon delimited list of probe
2885 execution by eliminating the write-protection faults
2912 virtualization on-demand when creating and destroying
2920 is that doing so may interfere with using out-of-tree
2947 back to huge pages. If the value is a non-zero N, KVM will
2952 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2955 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2956 a.k.a. Two-Dimensional Page Tables. Default is 1
2960 kvm-arm.mode=
2966 nvhe: Standard nVHE-based mode, without support for
2973 nested: VHE-based mode with support for nested
2981 command-line.
2985 kvm-arm.vgic_v3_group0_trap=
2986 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2989 kvm-arm.vgic_v3_group1_trap=
2990 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
2993 kvm-arm.vgic_v3_common_trap=
2997 kvm-arm.vgic_v4_enable=
3001 kvm-arm.wfe_trap_policy=
3010 kvm-arm.wfi_trap_policy=
3027 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
3028 a.k.a. Two-Dimensional Page Tables. Default is 1
3032 kvm-intel.emulate_invalid_guest_state=
3034 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
3040 kvm-intel.flexpriority=
3045 kvm-intel.nested=
3049 kvm-intel.unrestricted_guest=
3055 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
3056 CVE-2018-3620.
3067 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
3087 on - enable the interface for the mitigation
3152 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3158 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3162 value for LAPIC timer one-shot implementation. Default
3185 libata.force= [LIBATA] Force configurations. The format is a comma-
3197 first fan-out link behind PMP device. It does not
3211 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3218 * rstonce: only attempt one reset during hot-unplug
3261 * external: Mark port as external (hotplug-capable).
3315 Specify the number of self-propagating call_rcu()
3323 occasional long-duration lock hold time. Defaults
3334 Set the number of locking read-acquisition kthreads.
3339 Set the number of locking write-acquisition kthreads.
3342 Set time (s) after boot for CPU-hotplug testing.
3345 Set time (s) between CPU-hotplug operations, or
3346 zero to disable CPU-hotplug testing.
3349 Do periodic testing of real-time lock priority
3354 non-real-time spinlocks, due to their disabling
3355 of preemption. Note that non-realtime mutexes
3368 Set task-shuffle interval (jiffies). Shuffling
3369 tasks allows some CPUs to go into dyntick-idle
3374 is useful for hands-off automated testing.
3393 Run the write-side locktorture kthreads at
3394 sched_set_fifo() real-time priority.
3412 7 (KERN_DEBUG) debug-level messages
3424 logo.nologo [FB] Disables display of the built-in Linux logo.
3442 an IEEE 1284-compliant printer is attached; if
3448 time-consuming boot-time autodetection (up to 250 ms per
3468 Example: machtype=lemote-yeeloong-2f-7inch
3480 (loop.max_loop) unconditionally pre-created at init time. The default
3483 devices can be requested on-demand with the
3484 /dev/loop-control interface.
3486 mce= [X86-{32,64}]
3523 do not opt-in to Local MCE delivery. Use legacy method
3544 don't overwrite the bios-set CMCI threshold. This boot
3553 force-enable recoverable machine check code paths
3559 See Documentation/admin-guide/md.rst.
3566 Control mitigation for the Micro-architectural Data
3581 full - Enable MDS mitigation on vulnerable CPUs
3582 full,nosmt - Enable MDS mitigation and disable
3584 off - Unconditionally disable MDS mitigation
3586 On TAA-affected machines, mds=off can be prevented by
3595 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3610 [ARC,MICROBLAZE] - the limit applies only to low memory,
3613 [ARM64] - only limits memory covered by the linear
3626 [ARM,MIPS,EARLY] - override the memory layout
3633 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3640 per-device physically contiguous DMA buffers.
3648 See Documentation/admin-guide/mm/memory-hotplug.rst.
3673 Example: Exclude memory from 0x18690000-0x1869ffff
3687 memmap=<size>%<offset>-<oldtype>+<newtype>
3689 from <oldtype> to <newtype>. If "-<oldtype>" is left
3704 repeatable BIOS-originated corruption always
3748 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3754 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3758 s2idle - Suspend-To-Idle
3759 shallow - Power-On Suspend or equivalent (if supported)
3760 deep - Suspend-To-RAM or equivalent (if supported)
3761 See Documentation/admin-guide/pm/sleep-states.rst.
3763 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3779 0 - The attached screen is the 3.5" TFT
3780 1 - The attached screen is the 7" TFT
3781 2 - The VGA Shield is attached (1024x768)
3785 b - Enable backlight. The TFT backlight pin will be
3789 c - Enable the s3c camera interface.
3790 t - Reserved for enabling touchscreen support. The
3794 https://repo.or.cz/w/linux-2.6/mini2440.git
3799 arch-independent options, each of which is an
3800 aggregation of existing arch-specific options.
3830 ssbd=force-off [ARM64]
3844 have other ways of avoiding SMT-based attacks.
3858 supports attack-vector based controls as documented in
3859 Documentation/admin-guide/hw-vuln/attack_vector_controls.rst
3883 full - Enable mitigation on vulnerable CPUs
3885 full,nosmt - Enable mitigation and disable SMT on
3888 off - Unconditionally disable mitigation
3901 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3931 module_blacklist= [KNL] Do not load a comma-separated list of
3956 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3963 Format: <name>,<region-number>,<size>,<offset>
3966 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
4005 something different and driver-specific.
4045 [NFS] enable 64-bit inode numbers.
4046 If zero, the NFS client will fake up a 32-bit inode
4048 of returning the full 64-bit number.
4049 The default is to return 64-bit inode numbers.
4084 [NFS4] Specify an additional fixed unique ident-
4115 driver. A non-zero value sets the minimum interval
4120 server-to-server copies for which this server is
4132 server-to-server copy, knfsd temporarily mounts
4139 See Documentation/admin-guide/nfs/nfsroot.rst.
4141 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
4142 See Documentation/admin-guide/nfs/nfsroot.rst.
4145 See Documentation/admin-guide/nfs/nfsroot.rst.
4149 NMI stack-backtrace request.
4158 0 - turn hardlockup detector in nmi_watchdog off
4159 1 - turn hardlockup detector in nmi_watchdog on
4160 rNNN - configure the watchdog with raw perf event 0xNNN
4173 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4177 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4178 Forces kernel to use 3-level paging instead.
4180 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4181 kernel to use 4-level paging instead.
4216 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4218 noexec32 [X86-64]
4219 This affects only 32-bit executables.
4220 noexec32=on: enable non-executable mappings (default)
4222 noexec32=off: disable non-executable mappings
4233 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4235 legacy floating-point registers on task switch.
4280 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4282 [Deprecated - use intremap=off]
4288 noirqdebug [X86-32] Disables the code which attempts to detect and
4298 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4301 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4303 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4305 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4307 nomce [X86-32] Disable Machine Check Exception
4309 nomfgpt [X86-32] Disable Multi-Function General Purpose
4315 not load if they could possibly displace the pre-
4318 perform display-mode changes or accelerated rendering.
4331 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4336 nopti [X86-64,EARLY]
4352 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4358 no-scroll [VGA] Disables scrollback.
4359 This is required for the Braillex ib80-piezo Braille
4362 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4382 nosoftlockup [KNL] Disable the soft-lockup detector.
4388 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4401 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4408 timer IRQ sources, i.e., the IO-APIC timer. This can
4413 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4426 no-vmw-sched-clock
4431 soft-lockup and NMI watchdog (hard-lockup).
4435 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4443 enabling legacy floating-point and sse state.
4465 n. So during boot up some boot time memory for per-cpu
4466 variables need be pre-allocated for later physical cpu
4493 soft-reserved memory partitioning.
4502 See Documentation/admin-guide/sysctl/vm.rst for details.
4505 See Documentation/core-api/debugging-via-ohci1394.rst for more
4520 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4524 boundary - index of last SLC block on Flex-OneNAND.
4526 lock - Configure if Flex-OneNAND boundary should be locked.
4545 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4551 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4579 See Documentation/admin-guide/tainted-kernels.rst for
4651 Set to non-zero to probe primary and secondary ISA
4657 Set to non-zero if a chip is present that snoops speed
4705 Set to non-zero to probe tertiary and further ISA
4721 Set to non-zero to probe QDI controllers. By default
4726 Set to non-zero to probe Winbond controllers. Use
4773 bios [X86-32] force use of PCI BIOS, don't access
4775 has a non-standard PCI host bridge.
4776 nobios [X86-32] disallow use of PCI BIOS, only direct
4782 data in IO port 0xCFC, both 32-bit).
4784 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4785 the function, IO port 0xCFA, also 8-bit, sets
4787 through ports 0xC000-0xCFFF).
4794 root domains (aka PCI segments, in ACPI-speak).
4802 disable the use of MSI interrupts system-wide.
4807 primary IO-APIC for bridges that cannot disable
4814 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4838 F0000h-100000h range.
4843 assign-busses [X86] Always assign all PCI bus
4864 <linux-pci@vger.kernel.org>.
4868 a bug to <linux-pci@vger.kernel.org>.
4880 bfsort Sort PCI devices into breadth-first order.
4883 nobfsort Don't sort PCI devices into breadth-first order.
4885 tuning and use the BIOS-configured MPS defaults.
4895 configuration allows peer-to-peer DMA between
4898 that hot-added devices will work.
4913 A PCI-PCI bridge can be specified if resource
4919 for 4096-byte alignment.
4921 end-to-end CRC checking). Only effective if
4952 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4983 bit-0 : ACS Source Validation
4984 bit-1 : ACS Translation Blocking
4985 bit-2 : ACS P2P Request Redirect
4986 bit-3 : ACS P2P Completion Redirect
4987 bit-4 : ACS Upstream Forwarding
4988 bit-5 : ACS P2P Egress Control
4989 bit-6 : ACS Direct Translated P2P
4999 Validation unchanged from whatever power-up
5011 system-wide.
5025 dpc-native Use native PCIe service for DPC only. May
5042 Keep all power-domains already enabled by bootloader on,
5060 pirq= [SMP,APIC] Manual mp-table setup
5061 See Documentation/arch/x86/i386/IO-APIC.rst.
5065 See also Documentation/admin-guide/parport.rst.
5084 resume of devices during system-wide power transitions.
5086 dependencies are not well-defined, or for debugging
5096 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
5105 { on | off | curr | res | no-curr | no-res }
5150 none - Limited to cond_resched() calls
5151 voluntary - Limited to cond_resched() and might_sleep() calls
5152 full - Any section that isn't explicitly preempt disabled
5156 lazy - Scheduler controlled. Similar to full but instead
5162 print-fatal-signals=
5168 coredump - etc.
5171 you might want to try "ulimit -i unlimited".
5183 or lockdep-detected issues (only if lock debug is on).
5191 Allows storing messages from non-panic CPUs into
5193 flushed to consoles by the panic-CPU on
5194 a best-effort basis.
5200 on - unlimited logging to /dev/kmsg from userspace
5201 off - logging to /dev/kmsg disabled
5202 ratelimit - ratelimit the logging
5213 - 'always': traditional behavior always allows mem overrides.
5214 - 'ptrace': only allow mem overrides for active ptracers.
5215 - 'never': never allow mem overrides.
5219 Limit processor to maximum C-state
5223 Ignore the _CST method to determine C-states,
5230 Param: "schedule" - profile schedule points.
5231 Param: "kvm" - profile VM exits.
5232 Param: <number> - step/bucket size as a power of 2 for
5263 pti= [X86-64] Control Page Table Isolation of user and
5268 on - unconditionally enable
5269 off - unconditionally disable
5270 auto - kernel detects whether your CPU model is
5276 [KNL] Number of legacy pty's. Overwrites compiled-in
5288 See Documentation/admin-guide/md.rst.
5291 See Documentation/admin-guide/blockdev/ramdisk.rst.
5310 cross-syscall address exposures. This is only
5316 ras=option[,option,...] [KNL] RAS-specific options
5322 rcu_nocbs[=cpu-list]
5327 enable the no-callback CPU mode, which prevents
5332 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5336 and real-time workloads. It can also improve
5340 list of CPUs is set to no-callback mode from boot.
5344 no-callback mode from boot but the mode may be
5355 This improves the real-time response for the
5366 Do only a one-line RCU CPU stall warning when
5367 there is an ongoing too-long CSD-lock wait.
5373 If triggered before the RCU grace-period machinery
5383 RCU grace-period cleanup.
5387 RCU grace-period initialization.
5391 RCU grace-period pre-initialization, that is,
5392 the propagation of recent CPU-hotplug changes up
5396 Set delay from grace-period initialization to
5409 soliciting quiescent-state help from
5421 Set the SCHED_FIFO priority of the RCU per-CPU
5424 and for the RCU grace-period kthreads (rcu_bh,
5426 set, valid values are 1-99 and the default is 1
5427 (the least-favored priority). Otherwise, when
5428 RCU_BOOST is not set, valid values are 0-99 and
5429 the default is zero (non-realtime operation).
5434 On callback-offloaded (rcu_nocbs) CPUs,
5437 use of the ->nocb_bypass list. However, in the
5438 common non-flooded case, RCU queues directly to
5439 the main ->cblist in order to avoid the extra
5440 overhead of the ->nocb_bypass list and its lock.
5442 a single jiffy, RCU pre-queues the callbacks into
5443 the ->nocb_bypass queue. The definition of "too
5447 On callback-offloaded (rcu_nocbs) CPUs, avoid
5460 batch limiting is re-enabled.
5464 RCU's force-quiescent-state scan will aggressively
5472 Set the page-cache refill delay (in milliseconds)
5473 in response to low-memory conditions. The range
5477 Set the shift-right count to use to compute
5478 the callback-invocation batch limit bl from
5485 Please note that this callback-invocation batch
5486 limit applies only to non-offloaded callback
5495 cache-to-cache transfer latencies.
5501 and for NUMA systems with large remote-access
5517 the wakeup overhead on the global grace-period
5519 each group's NOCB grace-period kthread.
5522 Cause the grace-period kthread to get an extra
5524 it should at force-quiescent-state time.
5537 this specifies an rcu_read_unlock()-time delay
5541 of RCU-protected pointers after the relevant
5551 per-CPU rcuc kthreads. Defaults to a non-zero
5581 grace-period primitives such as call_rcu().
5592 grace-period primitives.
5595 Set test-start holdoff period. The purpose of
5613 Test the double-argument variant of kfree_rcu().
5615 rcuscale.kfree_rcu_test_single, both the single-
5616 and double-argument variants are tested.
5619 Test the single-argument variant of kfree_rcu().
5621 rcuscale.kfree_rcu_test_double, both the single-
5622 and double-argument variants are tested.
5636 does not affect the data-collection interval,
5641 Set number of RCU readers. The value -1 selects
5643 "n" less than -1 selects N-n+1, where N is again
5644 the number of CPUs. For example, -2 selects N
5645 (the number of CPUs), -3 selects N+1, and so on.
5646 A value of "n" less than or equal to -N selects
5659 complete. This is useful for hands-off automated
5666 Write-side holdoff between grace periods,
5671 Additional write-side holdoff between grace
5689 for RCU grace-period forward-progress testing
5696 Specify the fraction of a CPU-stall-warning
5697 period to do tight-loop forward-progress testing.
5701 forward-progress tests.
5705 need_resched() during tight-loop forward-progress
5709 Use conditional/asynchronous update-side
5710 normal-grace-period primitives, if available.
5713 Use conditional/asynchronous update-side
5714 expedited-grace-period primitives, if available.
5717 Use conditional/asynchronous update-side
5718 normal-grace-period primitives that also take
5723 Use conditional/asynchronous update-side
5724 expedited-grace-period primitives that also take
5748 Use expedited update-side primitives, if available.
5751 Use normal (non-expedited) asynchronous
5752 update-side primitives, if available.
5755 Use polled update-side normal-grace-period
5759 Use polled update-side expedited-grace-period
5763 Use polled update-side normal-grace-period
5768 Use polled update-side expedited-grace-period
5792 Use normal (non-expedited) synchronous
5793 update-side primitives, if available. If all
5797 they are all non-zero.
5800 Enable grace-period wrap lag testing. Setting
5805 Set the value for grace-period wrap lag during
5820 the grace-period wrap lag will be set to the
5830 Leak an RCU-protected pointer out of the reader.
5845 Set number of RCU callback-offload togglers.
5850 callback-offload toggling attempts.
5853 Set number of RCU readers. The value -1 selects
5854 N-1, where N is the number of CPUs. A value
5855 "n" less than -1 selects N-n-2, where N is again
5856 the number of CPUs. For example, -2 selects N
5857 (the number of CPUs), -3 selects N+1, and so on.
5860 Enable debug-object double-call_rcu() testing.
5863 Set time (s) after boot for CPU-hotplug testing.
5866 Set time (jiffies) between CPU-hotplug operations,
5867 or zero to disable CPU-hotplug testing.
5871 by a high-priority FIFO real-time task. Set to
5880 second) between preemptions by a high-priority
5881 FIFO real-time task. This delay is mediated
5886 The number of times in a given read-then-exit
5887 episode that a set of read-then-exit kthreads
5892 read-then-exit testing episodes.
5897 are entered from low-order bit up, and are
5899 0x1 bit is normal readers, 0x2 NMI-safe readers,
5900 and 0x4 light-weight readers.
5903 Set task-shuffle interval (s). Shuffling tasks
5904 allows some CPUs to go into dyntick-idle mode
5909 is useful for hands-off automated testing.
5918 any other stall-related activity. Note that
5924 in scheduling-while-atomic splats.
5943 grace-period kthread to test RCU CPU stall
5967 of RCU priority-boost testing. Defaults to zero,
5974 Test RCU's dyntick-idle handling. See also the
6029 Use expedited grace-period primitives, for
6033 real-time latency, and degrade energy efficiency.
6037 Use only normal grace-period primitives,
6040 real-time latency, CPU utilization, and
6042 increased grace-period latency. This parameter
6049 only normal grace-period primitives. No effect
6055 post-boot attempt at an expedited RCU grace
6056 period to instead use normal non-expedited
6057 grace-period processing.
6065 set to the default value of -1.
6068 Set the minimum number of callback-queuing-time
6069 lock-contention events per jiffy required to
6070 cause the RCU Tasks flavors to switch to per-CPU
6073 the default value of -1.
6078 of -1 allows this to be automatically (and
6086 number avoids disturbing real-time workloads,
6091 cancel laziness on that CPU. Use -1 to disable
6101 only printed prior to the stall-warning message
6149 force - Override the decision by the kernel to hide the
6188 There are some built-in platform specific "quirks"
6189 - you may see: "reboot: <name> series board detected.
6193 built-in quirk table, and use the generic default
6226 Set test-start holdoff period. The purpose of
6241 but the default has already reduced the per-pass
6246 Set number of readers. The default value of -1
6255 Set the read-side critical-section duration,
6259 Specify the read-protection implementation to test.
6285 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6315 reservetop= [X86-32,EARLY]
6332 See Documentation/power/swsusp-and-swap-files.rst
6348 AMD-based UNRET and IBPB mitigations alone do not stop
6350 sibling threads. For that reason, STIBP is used on pro-
6354 off - no mitigation
6355 auto - automatically select a migitation
6356 auto,nosmt - automatically select a mitigation,
6360 ibpb - On AMD, mitigate short speculation
6365 ibpb,nosmt - Like "ibpb" above but will disable SMT
6369 unret - Force enable untrained return thunks,
6370 only effective on AMD f15h-f17h based
6372 unret,nosmt - Like unret, but will disable SMT when STIBP
6404 ro [KNL] Mount root device read-only on boot
6407 on Mark read-only kernel memory as read-only (default).
6408 off Leave read-only kernel memory writable for debugging.
6409 full Mark read-only kernel memory and aliases as read-only
6416 debug-uart get routed to the D+ and D- pins of the usb
6422 block/early-lookup.c for details.
6452 rw [KNL] Mount root device read-write on boot
6481 solution to mutex-based priority inversion.
6511 to 10 seconds for built-in smp_call_function()
6518 that requesting even small non-zero numbers of
6525 The default of -1 specifies a number of kthreads
6530 test before initiating CPU-hotplug operations.
6534 CPU-hotplug operations. Specifying zero (which
6535 is the default) disables CPU-hotplug operations.
6541 Non-zero values are useful for automated tests.
6564 "wait" parameter. A value of -1 selects the
6565 default if all other weights are -1. However,
6567 value of -1 will instead select a weight of zero.
6572 non-zero "wait" parameter. See weight_single.
6585 non-zero "wait" parameter. See weight_single
6597 non-zero "wait" parameter. See weight_single
6608 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6609 1 -- enable.
6620 0 -- disable.
6621 1 -- enable.
6624 serialnumber [BUGS=X86-32]
6626 sev=option[,option...] [X86-64]
6632 Do not enable SEV-SNP (applies to host/hypervisor
6635 SEV-SNP guests.
6643 to set it to "all" by meaning -- no limit here.
6655 Documentation/admin-guide/mm/slab.rst.
6666 Documentation/admin-guide/mm/slab.rst.
6682 Documentation/admin-guide/mm/slab.rst.
6688 Documentation/admin-guide/mm/slab.rst.
6703 Documentation/admin-guide/mm/slab.rst.
6730 using the csdlock_debug- kernel parameter.
6735 system. By default, let CSD-lock acquisition
6737 for this value provides a 5-minute timeout.
6739 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6740 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6741 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6742 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6743 smsc-ircc2.ircc_irq= [HW] IRQ line
6744 smsc-ircc2.ircc_dma= [HW] DMA channel
6745 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6755 Default: -1 (no limit)
6758 [KNL] Should the soft-lockup detector generate panics.
6761 A value of 1 instructs the soft-lockup detector
6762 to panic the machine when a soft-lockup occurs. It is
6765 respective build-time switch to that functionality.
6768 [KNL] Should the soft-lockup detector generate
6773 See Documentation/admin-guide/laptops/sonypi.rst
6780 on - (default) Enable the HW or SW mitigation as
6783 vmexit - On systems which don't have the HW mitigation
6786 protected from VM-originated BHI attacks, but
6788 off - Disable the mitigation.
6795 on - unconditionally enable, implies
6797 off - unconditionally disable, implies
6799 auto - kernel detects whether your CPU model is
6818 retpoline - replace indirect branches
6819 retpoline,generic - Retpolines
6820 retpoline,lfence - LFENCE; indirect branch
6821 retpoline,amd - alias for retpoline,lfence
6822 eibrs - Enhanced/Auto IBRS
6823 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6824 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6825 ibrs - use IBRS to protect kernel
6835 on - Unconditionally enable mitigations. Is
6838 off - Unconditionally disable mitigations. Is
6841 prctl - Indirect branch speculation is enabled,
6847 - Like "prctl" above, but only STIBP is
6853 - Same as "prctl" above, but all seccomp
6858 - Like "seccomp" above, but only STIBP is
6863 auto - Kernel selects the mitigation depending on
6874 off - Disable mitigation
6875 microcode - Enable microcode mitigation only
6876 safe-ret - Enable sw-only safe RET mitigation (default)
6877 ibpb - Enable mitigation by issuing IBPB on
6879 ibpb-vmexit - Issue IBPB only on VMEXIT
6880 (cloud-specific mitigation)
6905 on - Unconditionally disable Speculative Store Bypass
6906 off - Unconditionally enable Speculative Store Bypass
6907 auto - Kernel detects whether the CPU model contains an
6913 prctl - Control Speculative Store Bypass per thread
6917 seccomp - Same as "prctl" above, but all seccomp threads
6925 on,auto - On Power8 and Power9 insert a store-forwarding
6929 off - No action.
6943 off - not enabled
6945 warn - the kernel will emit rate-limited warnings
6953 fatal - the kernel will send SIGBUS to applications
6958 ratelimit:N -
6978 Certain CPUs are vulnerable to an MDS-like
6998 This kernel-boot parameter defaults to 128,
6999 but takes effect only when the low-order four
7016 instead of the compile-time CONFIG_NR_CPUS.
7020 grace-period sequence counter wrap for the
7021 srcu_data structure's ->srcu_gp_seq_needed field.
7036 Specifies the number of no-delay instances
7043 Specifies the per-grace-period phase, number of
7044 non-sleeping polls of readers. Beyond this limit,
7050 Specifies number of microseconds of non-sleeping
7051 delay between each non-sleeping poll of readers.
7054 Specifies the number of update-side contention
7059 set for contention-based conversions to occur.
7069 force-on: Unconditionally enable mitigation for
7071 force-off: Unconditionally disable mitigation for
7093 stack traces. Pools are allocated on-demand up to this
7099 stacktrace_filter=[function-list]
7101 will trace at boot up. function-list is a comma-separated
7109 Set the STI (builtin display/keyboard on the HP-PARISC
7111 as the initial boot-console.
7171 to global on non-NUMA machines)
7196 <int> -- Number of I/O TLB slabs
7197 <int> -- Second integer after comma. Number of swiotlb
7200 force -- force using of bounce buffers even if they
7202 noforce -- Never use bounce buffers (for debugging)
7217 Ignore sysrq setting - this boot parameter will
7225 cache size. See Documentation/networking/ip-sysctl.rst
7232 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7237 wakeup-capable RTC alarm.
7243 -1: disable all active trip points in all thermal zones
7247 -1: disable all critical trip points in all thermal zones
7254 -1: disable all passive trip points
7260 <deci-seconds>: poll all this frequency
7264 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7269 See Documentation/admin-guide/mm/transhuge.rst for more
7277 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7283 See Documentation/admin-guide/mm/transhuge.rst for more
7295 Prevent the CPU-hotplug component of torturing
7299 Dump the ftrace buffer at torture-test shutdown,
7303 with rotating-rust storage.
7308 disables verbose-printk() sleeping.
7311 Duration of each verbose-printk() sleep in jiffies.
7344 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7382 local - Use the per CPU time stamp counter
7386 global - Event time stamps are synchronize across
7389 counter - Simple counting of events (1, 2, ..)
7393 uptime - Use jiffies as the time stamp.
7394 perf - Use the same clock that perf uses.
7395 mono - Use ktime_get_mono_fast_ns() for time stamps.
7396 mono_raw - Use ktime_get_raw_fast_ns() for time
7398 boot - Use ktime_get_boot_fast_ns() for time stamps.
7402 trace_event=[event-list]
7404 to facilitate early boot debugging. The event-list is a
7405 comma-separated list of trace events to enable. See
7416 trace_instance=[instance-info]
7441 traceoff - Have the tracing instance tracing disabled after it is created.
7442 traceprintk - Have trace_printk() write into this trace instance
7489 trace_options=[option-list]
7491 The option-list is a comma delimited list of options
7505 trace_trigger=[trigger-list]
7551 See Documentation/admin-guide/mm/transhuge.rst
7558 See Documentation/admin-guide/mm/transhuge.rst
7565 See Documentation/admin-guide/mm/transhuge.rst
7573 - "tpm"
7574 - "tee"
7575 - "caam"
7576 - "dcp"
7586 - "kernel"
7587 - the same value as trusted.source: "tpm" or "tee"
7588 - "default"
7611 off - disable the mitigation
7612 on - enable the mitigation (default)
7613 user - mitigate only user/kernel transitions
7614 vm - mitigate only guest/host transitions
7622 high-resolution timer mode on older hardware, and in
7658 on - Enable TSX on the system. Although there are
7661 several previous speculation-related CVEs, and
7665 off - Disable TSX on the system. (Note that this
7673 auto - Disable TSX if X86_BUG_TAA is present,
7678 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7684 Similar to Micro-architectural Data Sampling (MDS)
7699 full - Enable TAA mitigation on vulnerable CPUs
7702 full,nosmt - Enable TAA mitigation and disable SMT on
7705 vulnerable to cross-thread TAA attacks.
7706 off - Unconditionally disable TAA mitigation
7708 On MDS-affected machines, tsx_async_abort=off can be
7720 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7726 See also Documentation/input/devices/joystick-parport.rst
7728 udbg-immortal [PPC] When debugging early kernel crashes that
7734 Set number of hash buckets for UDP/UDP-Lite connections
7736 uhci-hcd.ignore_oc=
7738 Some badly-designed motherboards generate lots of
7763 unwind_debug [X86-64,EARLY]
7771 (default -1 = authorized (same as 1),
7777 for newly-detected USB devices (default 2). This
7805 [USB] Specifies timeout for the initial 64-byte
7812 [USB] A list of quirk entries to augment the built-in
7815 VendorID:ProductID:Flags. The IDs are 4-digit hex
7817 will change the built-in quirk; setting it if it is
7822 a 255-byte read);
7826 Set-Interface requests);
7845 (bInterval-1).
7883 usb-storage.delay_use=
7890 usb-storage.quirks=
7892 override the built-in unusual_devs list. List
7895 and Product ID values (4-digit hex numbers) and
7897 to a common usb-storage quirk flag as follows:
7939 medium is write-protected).
7948 1 - undefined instruction events
7949 2 - system calls
7950 4 - invalid data aborts
7951 8 - SIGSEGV faults
7952 16 - SIGBUS faults
7961 vdso32= [X86] Control the 32-bit vDSO
7962 vdso32=1: enable 32-bit VDSO
7963 vdso32=0 or vdso32=2: disable 32-bit VDSO
7973 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
8004 vga= [BOOT,X86-32] Select a particular video mode
8006 Documentation/admin-guide/svga.rst.
8021 - Disable all of the above options
8047 hypervisor to a guest via speculative side-channels.
8049 off - disable the mitigation
8050 ibpb - use Indirect Branch Prediction Barrier
8052 force - force vulnerability detection even on
8055 vsyscall= [X86-64,EARLY]
8058 code). Most statically-linked binaries and older
8082 see vga-softcursor.rst. Default: 2 = underline.
8087 This is a 16-member array composed of values
8088 ranging from 0-255.
8093 This is a 16-member array composed of values
8094 ranging from 0-255.
8099 This is a 16-member array composed of values
8100 ranging from 0-255.
8105 Set system-wide default UTF-8 mode for all tty's.
8106 Default is 1, i.e. UTF-8 mode is enabled for all
8111 Format=<-1|0|1>
8112 Set system-wide default for whether a cursor
8113 is shown on new VTs. Default is -1,
8118 vt.italic= [VT] Default color for italic text; 0-15.
8121 vt.underline= [VT] Default color for underlined text; 0-15.
8125 see Documentation/watchdog/watchdog-parameters.rst
8126 or other driver-specific files in the
8140 Format: <cpu-list>
8161 Per-cpu work items which run for longer than this
8164 them from noticeably delaying other per-cpu work
8182 Per-cpu workqueues are generally preferred because
8184 locality; unfortunately, per-cpu workqueues tend to
8187 Enabling this makes the per-cpu workqueues which
8201 Documentation/core-api/workqueue.rst.
8214 forces round-robin CPU selection to flush out
8222 on - Enable writecombine, use WUC for ioremap_wc()
8223 off - Disable writecombine, use SUC for ioremap_wc()
8225 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
8229 xen_512gb_limit [KNL,X86-64,XEN]
8239 ide-disks -- unplug primary master IDE devices
8240 aux-ide-disks -- unplug non-primary-master IDE devices
8241 nics -- unplug network devices
8242 all -- unplug all emulated devices (NICs and IDE disks)
8243 unnecessary -- unplugging emulated devices is
8246 never -- do not unplug even if version check succeeds
8260 Select whether to always use non-faulting (safe) MSR
8280 xen_timer_slop= [X86-64,XEN,EARLY]
8305 preferred over the 2-level event handling, as it is
8322 xive.store-eoi=off [PPC]
8328 xhci-hcd.quirks [USB,KNL]