Lines Matching +full:exynos4210 +full:- +full:ehci
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
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
494 audit= [KNL] Enable the audit sub-system
496 0 | off - kernel audit is disabled and can not be
498 unset - kernel audit is initialized but disabled and
500 1 | on - kernel audit is initialized and partially
513 0 - Disable the BAU.
514 1 - Enable the BAU.
515 unset - Disable the BAU.
554 See Documentation/block/cmdline-partition.rst
568 See Documentation/admin-guide/bootconfig.rst
573 bttv.pll= See Documentation/admin-guide/media/bttv.rst
582 cachesize= [BUGS=X86-32] Override level 2 CPU cache size detection.
601 inclusive. See arch/mips/include/asm/pgtable-bits.h
611 - foo isn't auto-mounted if you mount all cgroups in
613 - foo isn't visible as an individually mountable
615 - if foo is an optional feature then the feature is
621 Specifying "pressure" disables per-cgroup pressure
639 nosocket -- Disable socket memory accounting.
640 nokmem -- Disable kernel memory accounting.
641 nobpf -- Disable BPF memory accounting.
646 0 -- check protection applied by kernel (includes
648 1 -- check protection requested by application.
660 numbers X. Note the Linux-specific bits are not necessarily
661 stable over kernel options, but the vendor-specific
681 force such clocks to be always-on nor does it reserve
685 information, see Documentation/driver-api/clk.rst.
687 clock= [BUGS=X86-32, HW] gettimeofday clocksource override.
704 [X86-32] pit,hpet,tsc;
711 [X86-64] hpet,tsc
717 architected timer so that code using WFE-based polling
731 clocksource-wdtest.holdoff= [KNL]
737 cma=nn[MG]@[start[MG][-end[MG]]]
748 Sets the size of kernel per-numa memory area for
750 per-numa CMA altogether. And If this option is not
752 With per-numa CMA enabled, DMA users on node nid will
779 com20020= [HW,NET] ARCnet - COM20020 chipset
783 com90io= [HW,NET] ARCnet - COM90xx chipset (IO-mapped buffers)
787 ARCnet - COM90xx chipset (memory-mapped buffers)
816 See Documentation/admin-guide/serial-console.rst for more
831 $ ls -d /sys/bus/serial-base/devices/*:*.*/tty/*
832 /sys/bus/serial-base/devices/00:04:0.0/tty/ttyS0
845 Start an early, polled-mode console on the 8250/16550
848 MMIO inter-register address stride is either 8-bit
849 (mmio), 16-bit (mmio16), or 32-bit (mmio32).
853 the h/w is not re-initialized.
880 syscall, or to executing "dmesg -S --raw" or to reading
904 disable the cpuidle sub-system
910 disable the cpufreq sub-system
918 [X86,EARLY] Delay for N microsec between assert and de-assert
939 like Hyper-V, PowerPC (fadump) and AMD SEV-SNP.
947 [KNL, X86-64, ARM64, RISCV, LoongArch] Select a region
950 See Documentation/admin-guide/kdump/kdump.rst for further details.
955 start-[end] where start and end are both
957 Documentation/admin-guide/kdump/kdump.rst for an example.
960 [KNL, X86-64, ARM64, RISCV, LoongArch] range could be
968 [KNL, X86-64, ARM64, RISCV, LoongArch] range under 4G.
974 for 32-bit devices won't run out. Kernel would try to allocate
977 --> x86: max(swiotlb_size_or_default() + 8MiB, 256MiB)
978 --> arm64: 128MiB
979 --> riscv: 128MiB
980 --> loongarch: 128MiB
988 [KNL] Disable crypto self-tests
996 csdlock_debug= [KNL] Enable or disable debug add-ons of cross-CPU
1011 See also Documentation/input/devices/joystick-parport.rst
1024 [KNL] verbose locking self-tests
1027 self-tests.
1029 (no extra messages), setting it to -1 (all bits set)
1030 will print _a_lot_ more information - normally only
1065 Format: { on, no-mount, off }
1067 no-mount:
1072 get a -EPERM as result when trying to register files
1076 Default value is set in build-time with a kernel configuration.
1088 Documentation/admin-guide/mm/hugetlbpage.rst.
1102 delayacct [KNL] Enable per-task delay accounting
1188 entries for DMA-API debugging code. One entry is
1189 required per DMA-API allocation. Use this if the
1190 DMA-API debugging code disables itself because the
1194 With this option the DMA-API debugging driver
1218 Documentation/admin-guide/hw-vuln/reg-file-data-sampling.rst
1243 Control how the dt_cpu_ftrs device-tree binding is
1253 what data is available or for reverse-engineering.
1258 Documentation/admin-guide/dynamic-debug-howto.rst
1269 determined by stdout-path property in device tree's
1274 Start an early, polled-mode console on a Cadence
1285 Start an early, polled-mode console on the 8250/16550
1287 MMIO inter-register address stride is either 8-bit
1288 (mmio) or 32-bit (mmio32 or mmio32be).
1298 Start an early, polled-mode console on a pl011 serial
1302 the driver will use only 32-bit accessors to read/write
1311 Start an early, polled-mode console on a meson serial
1317 Start an early, polled-mode console on an msm serial
1323 Start an early, polled-mode console on an msm serial
1329 Start an early, polled-mode console on a serial port
1335 Start an early, polled-mode console on a serial port
1341 Use RISC-V SBI (Supervisor Binary Interface) for early
1351 exynos4210,<addr>
1359 Start an early, polled-mode console on a lantiq serial
1373 Start an early, polled-mode, output-only console on the
1378 Start an early, polled-mode console on the
1384 Start an early, polled-mode console on a Qualcomm
1392 coherent non-x86 systems that use system memory for
1495 Documentation/admin-guide/acpi/ssdt-overlays.rst for details.
1512 elanfreq= [X86-32]
1520 See Documentation/admin-guide/kdump/kdump.rst for details.
1536 0 -- permissive (log only, no denials).
1537 1 -- enforcing (deny and log).
1570 See also Documentation/fault-injection/.
1574 See Documentation/admin-guide/sysctl/net.rst for
1578 See Documentation/admin-guide/blockdev/floppy.rst.
1580 forcepae [X86-32]
1587 fred= [X86-64]
1638 ftrace_filter=[function-list]
1640 tracer at boot up. function-list is a comma-separated
1645 ftrace_notrace=[function-list]
1647 function-list. This list can be changed at run time
1651 ftrace_graph_filter=[function-list]
1654 function-list is a comma-separated list of functions
1658 ftrace_graph_notrace=[function-list]
1660 function-list. This list is a comma-separated list of
1680 off -- Don't create device links from firmware info.
1681 permissive -- Create device links from firmware info
1684 on -- Create device links from firmware info and use it
1686 rpm -- Like "on", but also use to order runtime PM.
1699 strict -- Default. Continue waiting on consumers to
1701 timeout -- Give up waiting on consumers and call
1711 See also Documentation/input/devices/joystick-parport.rst
1715 gart_fix_e820= [X86-64,EARLY] disable the fix e820 for K8 GART
1741 gcov_persist= [GCOV] When non-zero (default), profiling data for
1751 gpio-mockup.gpio_mockup_ranges
1754 gpio-mockup.gpio_mockup_named_lines
1786 against bounds-checking flaws in the kernel's
1794 [KNL] Should the hard-lockup detector generate
1800 for 64-bit NUMA, off otherwise.
1808 corresponding firmware-first mode error processing
1818 during restoration read-only).
1855 hpet= [X86-32,HPET] option to control HPET usage
1872 number of pages to allocate per-node can be specified.
1873 See also Documentation/admin-guide/mm/hugetlbpage.rst.
1884 Documentation/admin-guide/mm/hugetlbpage.rst.
1894 Note that this parameter only applies to non-gigantic huge pages.
1904 boot-time allocation of gigantic hugepages is skipped.
1939 by the CONFIG_BOOTPARAM_HUNG_TASK_PANIC build-time
1945 hvc_iucv_allow= [S390] Comma-separated list of z/VM user IDs.
1967 Set device-properties for ACPI-enumerated I2C-attached
1968 touchscreen, to e.g. fix coordinates of upside-down
1976 Omit "=<val>" entirely Set a boolean device-property
1977 Unsigned number Set a u32 device-property
1978 Anything else Set a string device-property
1981 i2c_touchscreen_props=GDIX1001:touchscreen-inverted-x:
1982 touchscreen-inverted-y
1984 i2c_touchscreen_props=MSSL1680:touchscreen-size-x=1920:
1985 touchscreen-size-y=1080:touchscreen-inverted-y:
1986 firmware-name=gsl1680-vendor-model.fw:silead,home-button
1991 (disabled by default, and as a pre-condition
1993 i8042.direct [HW] Put keyboard port into non-translated mode
2007 suspend-to-ram transitions, only during s2r
2031 -1 -- never invert brightness
2032 0 -- machine default
2033 1 -- force brightness inversion
2035 ia32_emulation= [X86-64]
2037 When true, allows loading 32-bit programs and executing 32-bit
2062 idle=nomwait: Disable mwait for CPU C-states
2090 legacy only accept legacy-NaN binaries, if supported
2092 2008 only accept 2008-NaN binaries, if supported
2103 'relaxed' straps the emulator for both legacy-NaN and
2104 2008-NaN, whereas 'strict' enables legacy-NaN only on
2113 Ignore loglevel setting - this will print /all/
2180 Formats: { "ima" | "ima-ng" | "ima-ngv2" | "ima-sig" |
2181 "ima-sigv2" }
2182 Default: "ima-ng"
2214 initcall_blacklist= [KNL] Do not execute a comma-separated list of
2215 initcall functions. Useful for debugging built-in
2260 0 -- basic integrity auditing messages. (Default)
2261 1 -- additional integrity auditing messages.
2289 could harm performance of some high-throughput
2298 1 to 9 specify maximum depth of C-state.
2307 algorithms for p-state selection. There are two
2308 P-state selection algorithms provided by
2311 on whether or not the hardware managed P-states
2318 used along with the hardware-managed P-states (HWP)
2322 in favor of acpi-cpufreq. Forcing the intel_pstate driver
2323 instead of acpi-cpufreq may disable platform features, such
2325 P-States information being indicated to OSPM and therefore
2328 or on platforms that use pcc-cpufreq instead of acpi-cpufreq.
2341 Allow per-logical-CPU P-State performance control limits using
2344 Do not enable capacity-aware scheduling (CAS) on
2347 intremap= [X86-64,Intel-IOMMU,EARLY]
2352 BIOS x2APIC opt-out request will be ignored
2395 AMD Gart HW IOMMU-specific options:
2414 Do scatter-gather (SG) merging. Implies "force"
2418 Don't do scatter-gather (SG) merging.
2431 0 - Try to allocate a 32-bit DMA address first, before
2433 1 - Allocate directly from the full usable range,
2435 greater than 32-bit addressing.
2439 0 - Lazy mode.
2445 1 - Strict mode.
2448 unset - Use value of CONFIG_IOMMU_DEFAULT_DMA_{LAZY,STRICT}.
2450 legacy driver-specific options takes precedence.
2455 0 - Use IOMMU translation for DMA.
2456 1 - Bypass the IOMMU for DMA.
2457 unset - Use value of CONFIG_IOMMU_DEFAULT_PASSTHROUGH.
2459 io7= [HW] IO7 for Marvel-based Alpha systems
2474 See Documentation/admin-guide/nfs/nfsroot.rst.
2510 Enables support for pseudo-NMIs in the kernel. This
2529 [Deprecated - use cpusets instead]
2530 Format: [flag-list,]<cpu-list>
2563 "number of CPUs in system - 1".
2589 The format of <cpu-list> is described above.
2593 ivrs_ioapic [HW,X86-64]
2594 Provide an override to the IOAPIC-ID<->DEVICE-ID
2598 For example, to map IOAPIC-ID decimal 10 to
2604 * To map IOAPIC-ID decimal 10 to PCI device 00:14.0
2607 * To map IOAPIC-ID decimal 10 to PCI segment 0x1 and
2611 ivrs_hpet [HW,X86-64]
2612 Provide an override to the HPET-ID<->DEVICE-ID
2616 For example, to map HPET-ID decimal 10 to
2622 * To map HPET-ID decimal 0 to PCI device 00:14.0
2625 * To map HPET-ID decimal 10 to PCI segment 0x1 and
2629 ivrs_acpihid [HW,X86-64]
2630 Provide an override to the ACPI-HID:UID<->DEVICE-ID
2634 For example, to map UART-HID:UID AMD0020:0 to
2640 * To map UART-HID:UID AMD0020:0 to PCI segment is 0,
2643 * To map UART-HID:UID AMD0020:0 to PCI segment 0x1 and
2667 the kernel for non-movable allocations. The requested
2677 subsystem. Note that allocations like PTEs-from-HighMem
2685 for non-movable allocations and remaining memory is used
2689 kgdbdbgp= [KGDB,HW,EARLY] kgdb over EHCI usb debug port.
2691 The controller # is the number of the ehci usb debug
2696 gdb or control-c on the dbgp connection. When
2697 not using this parameter you use sysrq-g to break into
2702 or a supported polling keyboard driver (non-usb).
2729 Configure the RouterBoard 532 series on-chip
2732 kmemleak= [KNL,EARLY] Boot-time kmemleak enable/disable
2738 kprobe_event=[probe-list]
2740 The probe-list is a semicolon delimited list of probe
2770 execution by eliminating the write-protection faults
2797 virtualization on-demand when creating and destroying
2805 is that doing so may interfere with using out-of-tree
2832 back to huge pages. If the value is a non-zero N, KVM will
2837 kvm-amd.nested= [KVM,AMD] Control nested virtualization feature in
2840 kvm-amd.npt= [KVM,AMD] Control KVM's use of Nested Page Tables,
2841 a.k.a. Two-Dimensional Page Tables. Default is 1
2845 kvm-arm.mode=
2851 nvhe: Standard nVHE-based mode, without support for
2858 nested: VHE-based mode with support for nested
2866 command-line.
2870 kvm-arm.vgic_v3_group0_trap=
2871 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-0
2874 kvm-arm.vgic_v3_group1_trap=
2875 [KVM,ARM,EARLY] Trap guest accesses to GICv3 group-1
2878 kvm-arm.vgic_v3_common_trap=
2882 kvm-arm.vgic_v4_enable=
2886 kvm-arm.wfe_trap_policy=
2895 kvm-arm.wfi_trap_policy=
2912 kvm-intel.ept= [KVM,Intel] Control KVM's use of Extended Page Tables,
2913 a.k.a. Two-Dimensional Page Tables. Default is 1
2917 kvm-intel.emulate_invalid_guest_state=
2919 state. Ignored if kvm-intel.enable_unrestricted_guest=1,
2925 kvm-intel.flexpriority=
2930 kvm-intel.nested=
2934 kvm-intel.unrestricted_guest=
2940 kvm-intel.vmentry_l1d_flush=[KVM,Intel] Mitigation for L1 Terminal Fault
2941 CVE-2018-3620.
2952 kvm-intel.vpid= [KVM,Intel] Control KVM's use of Virtual Processor
2972 on - enable the interface for the mitigation
3037 For details see: Documentation/admin-guide/hw-vuln/l1tf.rst
3043 lapic [X86-32,APIC,EARLY] Enable the local APIC even if BIOS
3047 value for LAPIC timer one-shot implementation. Default
3070 libata.force= [LIBATA] Force configurations. The format is a comma-
3082 first fan-out link behind PMP device. It does not
3096 * Transfer mode: pio[0-7], mwdma[0-4] and udma[0-7].
3103 * rstonce: only attempt one reset during hot-unplug
3146 * external: Mark port as external (hotplug-capable).
3200 Specify the number of self-propagating call_rcu()
3208 occasional long-duration lock hold time. Defaults
3219 Set the number of locking read-acquisition kthreads.
3224 Set the number of locking write-acquisition kthreads.
3227 Set time (s) after boot for CPU-hotplug testing.
3230 Set time (s) between CPU-hotplug operations, or
3231 zero to disable CPU-hotplug testing.
3234 Do periodic testing of real-time lock priority
3239 non-real-time spinlocks, due to their disabling
3240 of preemption. Note that non-realtime mutexes
3253 Set task-shuffle interval (jiffies). Shuffling
3254 tasks allows some CPUs to go into dyntick-idle
3259 is useful for hands-off automated testing.
3278 Run the write-side locktorture kthreads at
3279 sched_set_fifo() real-time priority.
3297 7 (KERN_DEBUG) debug-level messages
3309 logo.nologo [FB] Disables display of the built-in Linux logo.
3327 an IEEE 1284-compliant printer is attached; if
3333 time-consuming boot-time autodetection (up to 250 ms per
3353 Example: machtype=lemote-yeeloong-2f-7inch
3365 (loop.max_loop) unconditionally pre-created at init time. The default
3368 devices can be requested on-demand with the
3369 /dev/loop-control interface.
3371 mce= [X86-{32,64}]
3408 do not opt-in to Local MCE delivery. Use legacy method
3429 don't overwrite the bios-set CMCI threshold. This boot
3438 force-enable recoverable machine check code paths
3444 See Documentation/admin-guide/md.rst.
3451 Control mitigation for the Micro-architectural Data
3466 full - Enable MDS mitigation on vulnerable CPUs
3467 full,nosmt - Enable MDS mitigation and disable
3469 off - Unconditionally disable MDS mitigation
3471 On TAA-affected machines, mds=off can be prevented by
3480 For details see: Documentation/admin-guide/hw-vuln/mds.rst
3495 [ARC,MICROBLAZE] - the limit applies only to low memory,
3498 [ARM64] - only limits memory covered by the linear
3511 [ARM,MIPS,EARLY] - override the memory layout
3518 mem=nopentium [BUGS=X86-32] Disable usage of 4MB pages for kernel
3525 per-device physically contiguous DMA buffers.
3533 See Documentation/admin-guide/mm/memory-hotplug.rst.
3558 Example: Exclude memory from 0x18690000-0x1869ffff
3572 memmap=<size>%<offset>-<oldtype>+<newtype>
3574 from <oldtype> to <newtype>. If "-<oldtype>" is left
3589 repeatable BIOS-originated corruption always
3633 mem_encrypt= [X86-64] AMD Secure Memory Encryption (SME) control
3639 Refer to Documentation/virt/kvm/x86/amd-memory-encryption.rst
3643 s2idle - Suspend-To-Idle
3644 shallow - Power-On Suspend or equivalent (if supported)
3645 deep - Suspend-To-RAM or equivalent (if supported)
3646 See Documentation/admin-guide/pm/sleep-states.rst.
3648 mfgptfix [X86-32] Fix MFGPT timers on AMD Geode platforms when
3664 0 - The attached screen is the 3.5" TFT
3665 1 - The attached screen is the 7" TFT
3666 2 - The VGA Shield is attached (1024x768)
3670 b - Enable backlight. The TFT backlight pin will be
3674 c - Enable the s3c camera interface.
3675 t - Reserved for enabling touchscreen support. The
3679 https://repo.or.cz/w/linux-2.6/mini2440.git
3684 arch-independent options, each of which is an
3685 aggregation of existing arch-specific options.
3714 ssbd=force-off [ARM64]
3727 have other ways of avoiding SMT-based attacks.
3762 full - Enable mitigation on vulnerable CPUs
3764 full,nosmt - Enable mitigation and disable SMT on
3767 off - Unconditionally disable mitigation
3780 Documentation/admin-guide/hw-vuln/processor_mmio_stale_data.rst
3810 module_blacklist= [KNL] Do not load a comma-separated list of
3835 movable_node [KNL,EARLY] Boot-time switch to make hotplugable memory
3842 Format: <name>,<region-number>,<size>,<offset>
3845 <name>,<region-number>[,<base>,<size>,<buswidth>,<altbuswidth>]
3884 something different and driver-specific.
3924 [NFS] enable 64-bit inode numbers.
3925 If zero, the NFS client will fake up a 32-bit inode
3927 of returning the full 64-bit number.
3928 The default is to return 64-bit inode numbers.
3963 [NFS4] Specify an additional fixed unique ident-
3994 driver. A non-zero value sets the minimum interval
3999 server-to-server copies for which this server is
4011 server-to-server copy, knfsd temporarily mounts
4018 See Documentation/admin-guide/nfs/nfsroot.rst.
4020 nfsroot= [NFS] nfs root filesystem for disk-less boxes.
4021 See Documentation/admin-guide/nfs/nfsroot.rst.
4024 See Documentation/admin-guide/nfs/nfsroot.rst.
4028 NMI stack-backtrace request.
4037 0 - turn hardlockup detector in nmi_watchdog off
4038 1 - turn hardlockup detector in nmi_watchdog on
4039 rNNN - configure the watchdog with raw perf event 0xNNN
4052 no387 [BUGS=X86-32] Tells the kernel to use the 387 maths
4056 no4lvl [RISCV,EARLY] Disable 4-level and 5-level paging modes.
4057 Forces kernel to use 3-level paging instead.
4059 no5lvl [X86-64,RISCV,EARLY] Disable 5-level paging mode. Forces
4060 kernel to use 4-level paging instead.
4095 no_entry_flush [PPC,EARLY] Don't flush the L1-D cache when entering the kernel.
4097 noexec32 [X86-64]
4098 This affects only 32-bit executables.
4099 noexec32=on: enable non-executable mappings (default)
4101 noexec32=off: disable non-executable mappings
4112 nofxsr [BUGS=X86-32] Disables x86 floating point extended
4114 legacy floating-point registers on task switch.
4127 compared. However, if this command-line option is
4170 nointremap [X86-64,Intel-IOMMU,EARLY] Do not enable interrupt
4172 [Deprecated - use intremap=off]
4178 noirqdebug [X86-32] Disables the code which attempts to detect and
4188 no-kvmapf [X86,KVM,EARLY] Disable paravirtualized asynchronous page
4191 no-kvmclock [X86,KVM,EARLY] Disable paravirtualized KVM clock driver
4193 nolapic [X86-32,APIC,EARLY] Do not enable or use the local APIC.
4195 nolapic_timer [X86-32,APIC,EARLY] Do not use the local APIC timer.
4197 nomce [X86-32] Disable Machine Check Exception
4199 nomfgpt [X86-32] Disable Multi-Function General Purpose
4205 not load if they could possibly displace the pre-
4208 perform display-mode changes or accelerated rendering.
4221 nopcid [X86-64,EARLY] Disable the PCID cpu feature.
4226 nopti [X86-64,EARLY]
4242 noreplace-smp [X86-32,SMP] Don't replace SMP instructions
4248 no-scroll [VGA] Disables scrollback.
4249 This is required for the Braillex ib80-piezo Braille
4252 nosgx [X86-64,SGX,EARLY] Disables Intel SGX kernel support.
4272 nosoftlockup [KNL] Disable the soft-lockup detector.
4278 nospectre_bhb [ARM64,EARLY] Disable all mitigations for Spectre-BHB (branch
4291 no-steal-acc [X86,PV_OPS,ARM64,PPC/PSERIES,RISCV,LOONGARCH,EARLY]
4298 timer IRQ sources, i.e., the IO-APIC timer. This can
4303 [PPC,EARLY] Don't flush the L1-D cache after accessing user data.
4316 no-vmw-sched-clock
4321 soft-lockup and NMI watchdog (hard-lockup).
4325 nox2apic [X86-64,APIC,EARLY] Do not enable x2APIC mode.
4333 enabling legacy floating-point and sse state.
4355 n. So during boot up some boot time memory for per-cpu
4356 variables need be pre-allocated for later physical cpu
4383 soft-reserved memory partitioning.
4392 See Documentation/admin-guide/sysctl/vm.rst for details.
4395 See Documentation/core-api/debugging-via-ohci1394.rst for more
4410 onenand.bdry= [HW,MTD] Flex-OneNAND Boundary Configuration
4414 boundary - index of last SLC block on Flex-OneNAND.
4416 lock - Configure if Flex-OneNAND boundary should be locked.
4435 page_owner= [KNL,EARLY] Boot-time page_owner enabling option.
4441 page_poison= [KNL,EARLY] Boot-time parameter changing the state of
4469 See Documentation/admin-guide/tainted-kernels.rst for
4522 Set to non-zero to probe primary and secondary ISA
4528 Set to non-zero if a chip is present that snoops speed
4576 Set to non-zero to probe tertiary and further ISA
4592 Set to non-zero to probe QDI controllers. By default
4597 Set to non-zero to probe Winbond controllers. Use
4644 bios [X86-32] force use of PCI BIOS, don't access
4646 has a non-standard PCI host bridge.
4647 nobios [X86-32] disallow use of PCI BIOS, only direct
4653 data in IO port 0xCFC, both 32-bit).
4655 Mechanism 2 (IO port 0xCF8 is an 8-bit port for
4656 the function, IO port 0xCFA, also 8-bit, sets
4658 through ports 0xC000-0xCFFF).
4665 root domains (aka PCI segments, in ACPI-speak).
4673 disable the use of MSI interrupts system-wide.
4678 primary IO-APIC for bridges that cannot disable
4685 biosirq [X86-32] Use PCI BIOS calls to get the interrupt
4709 F0000h-100000h range.
4714 assign-busses [X86] Always assign all PCI bus
4735 <linux-pci@vger.kernel.org>.
4739 a bug to <linux-pci@vger.kernel.org>.
4751 bfsort Sort PCI devices into breadth-first order.
4754 nobfsort Don't sort PCI devices into breadth-first order.
4756 tuning and use the BIOS-configured MPS defaults.
4766 configuration allows peer-to-peer DMA between
4769 that hot-added devices will work.
4784 A PCI-PCI bridge can be specified if resource
4790 for 4096-byte alignment.
4792 end-to-end CRC checking). Only effective if
4823 noats [PCIE, Intel-IOMMU, AMD-IOMMU]
4854 bit-0 : ACS Source Validation
4855 bit-1 : ACS Translation Blocking
4856 bit-2 : ACS P2P Request Redirect
4857 bit-3 : ACS P2P Completion Redirect
4858 bit-4 : ACS Upstream Forwarding
4859 bit-5 : ACS P2P Egress Control
4860 bit-6 : ACS Direct Translated P2P
4870 Validation unchanged from whatever power-up
4882 system-wide.
4896 dpc-native Use native PCIe service for DPC only. May
4913 Keep all power-domains already enabled by bootloader on,
4931 pirq= [SMP,APIC] Manual mp-table setup
4932 See Documentation/arch/x86/i386/IO-APIC.rst.
4936 See also Documentation/admin-guide/parport.rst.
4955 CONFIG_PNP_DEBUG_MESSAGES option). Change at run-time
4964 { on | off | curr | res | no-curr | no-res }
5009 none - Limited to cond_resched() calls
5010 voluntary - Limited to cond_resched() and might_sleep() calls
5011 full - Any section that isn't explicitly preempt disabled
5015 lazy - Scheduler controlled. Similar to full but instead
5021 print-fatal-signals=
5027 coredump - etc.
5030 you might want to try "ulimit -i unlimited".
5042 or lockdep-detected issues (only if lock debug is on).
5050 Allows storing messages from non-panic CPUs into
5052 flushed to consoles by the panic-CPU on
5053 a best-effort basis.
5059 on - unlimited logging to /dev/kmsg from userspace
5060 off - logging to /dev/kmsg disabled
5061 ratelimit - ratelimit the logging
5072 - 'always': traditional behavior always allows mem overrides.
5073 - 'ptrace': only allow mem overrides for active ptracers.
5074 - 'never': never allow mem overrides.
5078 Limit processor to maximum C-state
5082 Ignore the _CST method to determine C-states,
5089 Param: "schedule" - profile schedule points.
5090 Param: "kvm" - profile VM exits.
5091 Param: <number> - step/bucket size as a power of 2 for
5122 pti= [X86-64] Control Page Table Isolation of user and
5127 on - unconditionally enable
5128 off - unconditionally disable
5129 auto - kernel detects whether your CPU model is
5135 [KNL] Number of legacy pty's. Overwrites compiled-in
5147 See Documentation/admin-guide/md.rst.
5150 See Documentation/admin-guide/blockdev/ramdisk.rst.
5169 cross-syscall address exposures. This is only
5175 ras=option[,option,...] [KNL] RAS-specific options
5181 rcu_nocbs[=cpu-list]
5186 enable the no-callback CPU mode, which prevents
5191 "p" for RCU-preempt, "s" for RCU-sched, and "g"
5195 and real-time workloads. It can also improve
5199 list of CPUs is set to no-callback mode from boot.
5203 no-callback mode from boot but the mode may be
5214 This improves the real-time response for the
5225 Do only a one-line RCU CPU stall warning when
5226 there is an ongoing too-long CSD-lock wait.
5232 If triggered before the RCU grace-period machinery
5242 RCU grace-period cleanup.
5246 RCU grace-period initialization.
5250 RCU grace-period pre-initialization, that is,
5251 the propagation of recent CPU-hotplug changes up
5255 Set delay from grace-period initialization to
5268 soliciting quiescent-state help from
5280 Set the SCHED_FIFO priority of the RCU per-CPU
5283 and for the RCU grace-period kthreads (rcu_bh,
5285 set, valid values are 1-99 and the default is 1
5286 (the least-favored priority). Otherwise, when
5287 RCU_BOOST is not set, valid values are 0-99 and
5288 the default is zero (non-realtime operation).
5293 On callback-offloaded (rcu_nocbs) CPUs,
5296 use of the ->nocb_bypass list. However, in the
5297 common non-flooded case, RCU queues directly to
5298 the main ->cblist in order to avoid the extra
5299 overhead of the ->nocb_bypass list and its lock.
5301 a single jiffy, RCU pre-queues the callbacks into
5302 the ->nocb_bypass queue. The definition of "too
5306 On callback-offloaded (rcu_nocbs) CPUs, avoid
5319 batch limiting is re-enabled.
5323 RCU's force-quiescent-state scan will aggressively
5331 Set the page-cache refill delay (in milliseconds)
5332 in response to low-memory conditions. The range
5336 Set the shift-right count to use to compute
5337 the callback-invocation batch limit bl from
5344 Please note that this callback-invocation batch
5345 limit applies only to non-offloaded callback
5354 cache-to-cache transfer latencies.
5360 and for NUMA systems with large remote-access
5376 the wakeup overhead on the global grace-period
5378 each group's NOCB grace-period kthread.
5381 Cause the grace-period kthread to get an extra
5383 it should at force-quiescent-state time.
5396 this specifies an rcu_read_unlock()-time delay
5400 of RCU-protected pointers after the relevant
5410 per-CPU rcuc kthreads. Defaults to a non-zero
5439 grace-period primitives such as call_rcu().
5450 grace-period primitives.
5453 Set test-start holdoff period. The purpose of
5471 Test the double-argument variant of kfree_rcu().
5473 rcuscale.kfree_rcu_test_single, both the single-
5474 and double-argument variants are tested.
5477 Test the single-argument variant of kfree_rcu().
5479 rcuscale.kfree_rcu_test_double, both the single-
5480 and double-argument variants are tested.
5494 does not affect the data-collection interval,
5499 Set number of RCU readers. The value -1 selects
5501 "n" less than -1 selects N-n+1, where N is again
5502 the number of CPUs. For example, -2 selects N
5503 (the number of CPUs), -3 selects N+1, and so on.
5504 A value of "n" less than or equal to -N selects
5517 complete. This is useful for hands-off automated
5524 Write-side holdoff between grace periods,
5529 Additional write-side holdoff between grace
5547 for RCU grace-period forward-progress testing
5554 Specify the fraction of a CPU-stall-warning
5555 period to do tight-loop forward-progress testing.
5559 forward-progress tests.
5563 need_resched() during tight-loop forward-progress
5567 Use conditional/asynchronous update-side
5568 normal-grace-period primitives, if available.
5571 Use conditional/asynchronous update-side
5572 expedited-grace-period primitives, if available.
5575 Use conditional/asynchronous update-side
5576 normal-grace-period primitives that also take
5581 Use conditional/asynchronous update-side
5582 expedited-grace-period primitives that also take
5606 Use expedited update-side primitives, if available.
5609 Use normal (non-expedited) asynchronous
5610 update-side primitives, if available.
5613 Use polled update-side normal-grace-period
5617 Use polled update-side expedited-grace-period
5621 Use polled update-side normal-grace-period
5626 Use polled update-side expedited-grace-period
5650 Use normal (non-expedited) synchronous
5651 update-side primitives, if available. If all
5655 they are all non-zero.
5663 Leak an RCU-protected pointer out of the reader.
5678 Set number of RCU callback-offload togglers.
5683 callback-offload toggling attempts.
5686 Set number of RCU readers. The value -1 selects
5687 N-1, where N is the number of CPUs. A value
5688 "n" less than -1 selects N-n-2, where N is again
5689 the number of CPUs. For example, -2 selects N
5690 (the number of CPUs), -3 selects N+1, and so on.
5693 Enable debug-object double-call_rcu() testing.
5696 Set time (s) after boot for CPU-hotplug testing.
5699 Set time (jiffies) between CPU-hotplug operations,
5700 or zero to disable CPU-hotplug testing.
5704 by a high-priority FIFO real-time task. Set to
5713 second) between preemptions by a high-priority
5714 FIFO real-time task. This delay is mediated
5719 The number of times in a given read-then-exit
5720 episode that a set of read-then-exit kthreads
5725 read-then-exit testing episodes.
5730 are entered from low-order bit up, and are
5732 0x1 bit is normal readers, 0x2 NMI-safe readers,
5733 and 0x4 light-weight readers.
5736 Set task-shuffle interval (s). Shuffling tasks
5737 allows some CPUs to go into dyntick-idle mode
5742 is useful for hands-off automated testing.
5751 any other stall-related activity. Note that
5757 in scheduling-while-atomic splats.
5776 grace-period kthread to test RCU CPU stall
5800 of RCU priority-boost testing. Defaults to zero,
5807 Test RCU's dyntick-idle handling. See also the
5862 Use expedited grace-period primitives, for
5866 real-time latency, and degrade energy efficiency.
5870 Use only normal grace-period primitives,
5873 real-time latency, CPU utilization, and
5875 increased grace-period latency. This parameter
5882 only normal grace-period primitives. No effect
5888 post-boot attempt at an expedited RCU grace
5889 period to instead use normal non-expedited
5890 grace-period processing.
5898 set to the default value of -1.
5901 Set the minimum number of callback-queuing-time
5902 lock-contention events per jiffy required to
5903 cause the RCU Tasks flavors to switch to per-CPU
5906 the default value of -1.
5911 of -1 allows this to be automatically (and
5919 number avoids disturbing real-time workloads,
5924 cancel laziness on that CPU. Use -1 to disable
5934 only printed prior to the stall-warning message
5982 force - Override the decision by the kernel to hide the
6021 There are some built-in platform specific "quirks"
6022 - you may see: "reboot: <name> series board detected.
6026 built-in quirk table, and use the generic default
6059 Set test-start holdoff period. The purpose of
6074 but the default has already reduced the per-pass
6079 Set number of readers. The default value of -1
6088 Set the read-side critical-section duration,
6092 Specify the read-protection implementation to test.
6118 See Documentation/admin-guide/cgroup-v1/cpusets.rst.
6148 reservetop= [X86-32,EARLY]
6165 See Documentation/power/swsusp-and-swap-files.rst
6181 AMD-based UNRET and IBPB mitigations alone do not stop
6183 sibling threads. For that reason, STIBP is used on pro-
6187 off - no mitigation
6188 auto - automatically select a migitation
6189 auto,nosmt - automatically select a mitigation,
6193 ibpb - On AMD, mitigate short speculation
6198 ibpb,nosmt - Like "ibpb" above but will disable SMT
6202 unret - Force enable untrained return thunks,
6203 only effective on AMD f15h-f17h based
6205 unret,nosmt - Like unret, but will disable SMT when STIBP
6237 ro [KNL] Mount root device read-only on boot
6240 on Mark read-only kernel memory as read-only (default).
6241 off Leave read-only kernel memory writable for debugging.
6242 full Mark read-only kernel memory and aliases as read-only
6249 debug-uart get routed to the D+ and D- pins of the usb
6255 block/early-lookup.c for details.
6280 rw [KNL] Mount root device read-write on boot
6334 to 10 seconds for built-in smp_call_function()
6341 that requesting even small non-zero numbers of
6348 The default of -1 specifies a number of kthreads
6353 test before initiating CPU-hotplug operations.
6357 CPU-hotplug operations. Specifying zero (which
6358 is the default) disables CPU-hotplug operations.
6364 Non-zero values are useful for automated tests.
6387 "wait" parameter. A value of -1 selects the
6388 default if all other weights are -1. However,
6390 value of -1 will instead select a weight of zero.
6395 non-zero "wait" parameter. See weight_single.
6408 non-zero "wait" parameter. See weight_single
6420 non-zero "wait" parameter. See weight_single
6431 0 -- disable. (may be 1 via CONFIG_CMDLINE="skew_tick=1"
6432 1 -- enable.
6443 0 -- disable.
6444 1 -- enable.
6447 serialnumber [BUGS=X86-32]
6449 sev=option[,option...] [X86-64]
6455 Do not enable SEV-SNP (applies to host/hypervisor
6458 SEV-SNP guests.
6466 to set it to "all" by meaning -- no limit here.
6547 using the csdlock_debug- kernel parameter.
6552 system. By default, let CSD-lock acquisition
6554 for this value provides a 5-minute timeout.
6556 smsc-ircc2.nopnp [HW] Don't use PNP to discover SMC devices
6557 smsc-ircc2.ircc_cfg= [HW] Device configuration I/O port
6558 smsc-ircc2.ircc_sir= [HW] SIR base I/O port
6559 smsc-ircc2.ircc_fir= [HW] FIR base I/O port
6560 smsc-ircc2.ircc_irq= [HW] IRQ line
6561 smsc-ircc2.ircc_dma= [HW] DMA channel
6562 smsc-ircc2.ircc_transceiver= [HW] Transceiver type:
6572 Default: -1 (no limit)
6575 [KNL] Should the soft-lockup detector generate panics.
6578 A value of 1 instructs the soft-lockup detector
6579 to panic the machine when a soft-lockup occurs. It is
6582 respective build-time switch to that functionality.
6585 [KNL] Should the soft-lockup detector generate
6590 See Documentation/admin-guide/laptops/sonypi.rst
6597 on - (default) Enable the HW or SW mitigation as
6600 vmexit - On systems which don't have the HW mitigation
6603 protected from VM-originated BHI attacks, but
6605 off - Disable the mitigation.
6612 on - unconditionally enable, implies
6614 off - unconditionally disable, implies
6616 auto - kernel detects whether your CPU model is
6635 retpoline - replace indirect branches
6636 retpoline,generic - Retpolines
6637 retpoline,lfence - LFENCE; indirect branch
6638 retpoline,amd - alias for retpoline,lfence
6639 eibrs - Enhanced/Auto IBRS
6640 eibrs,retpoline - Enhanced/Auto IBRS + Retpolines
6641 eibrs,lfence - Enhanced/Auto IBRS + LFENCE
6642 ibrs - use IBRS to protect kernel
6652 on - Unconditionally enable mitigations. Is
6655 off - Unconditionally disable mitigations. Is
6658 prctl - Indirect branch speculation is enabled,
6664 - Like "prctl" above, but only STIBP is
6670 - Same as "prctl" above, but all seccomp
6675 - Like "seccomp" above, but only STIBP is
6680 auto - Kernel selects the mitigation depending on
6691 off - Disable mitigation
6692 microcode - Enable microcode mitigation only
6693 safe-ret - Enable sw-only safe RET mitigation (default)
6694 ibpb - Enable mitigation by issuing IBPB on
6696 ibpb-vmexit - Issue IBPB only on VMEXIT
6697 (cloud-specific mitigation)
6722 on - Unconditionally disable Speculative Store Bypass
6723 off - Unconditionally enable Speculative Store Bypass
6724 auto - Kernel detects whether the CPU model contains an
6730 prctl - Control Speculative Store Bypass per thread
6734 seccomp - Same as "prctl" above, but all seccomp threads
6742 on,auto - On Power8 and Power9 insert a store-forwarding
6746 off - No action.
6760 off - not enabled
6762 warn - the kernel will emit rate-limited warnings
6770 fatal - the kernel will send SIGBUS to applications
6775 ratelimit:N -
6795 Certain CPUs are vulnerable to an MDS-like
6815 This kernel-boot parameter defaults to 128,
6816 but takes effect only when the low-order four
6833 instead of the compile-time CONFIG_NR_CPUS.
6837 grace-period sequence counter wrap for the
6838 srcu_data structure's ->srcu_gp_seq_needed field.
6853 Specifies the number of no-delay instances
6860 Specifies the per-grace-period phase, number of
6861 non-sleeping polls of readers. Beyond this limit,
6867 Specifies number of microseconds of non-sleeping
6868 delay between each non-sleeping poll of readers.
6871 Specifies the number of update-side contention
6876 set for contention-based conversions to occur.
6886 force-on: Unconditionally enable mitigation for
6888 force-off: Unconditionally disable mitigation for
6911 stacktrace_filter=[function-list]
6913 will trace at boot up. function-list is a comma-separated
6921 Set the STI (builtin display/keyboard on the HP-PARISC
6923 as the initial boot-console.
6983 to global on non-NUMA machines)
7008 <int> -- Number of I/O TLB slabs
7009 <int> -- Second integer after comma. Number of swiotlb
7012 force -- force using of bounce buffers even if they
7014 noforce -- Never use bounce buffers (for debugging)
7029 Ignore sysrq setting - this boot parameter will
7037 cache size. See Documentation/networking/ip-sysctl.rst
7044 Specify "mem" (for Suspend-to-RAM) or "standby" (for
7049 wakeup-capable RTC alarm.
7055 -1: disable all active trip points in all thermal zones
7059 -1: disable all critical trip points in all thermal zones
7066 -1: disable all passive trip points
7072 <deci-seconds>: poll all this frequency
7076 Format: <size>[KMG],<size>[KMG]:<state>;<size>[KMG]-<size>[KMG]:<state>
7081 See Documentation/admin-guide/mm/transhuge.rst for more
7089 Format: <size>[KMG],<size>[KMG]:<policy>;<size>[KMG]-<size>[KMG]:<policy>
7095 See Documentation/admin-guide/mm/transhuge.rst for more
7107 Prevent the CPU-hotplug component of torturing
7111 Dump the ftrace buffer at torture-test shutdown,
7115 with rotating-rust storage.
7120 disables verbose-printk() sleeping.
7123 Duration of each verbose-printk() sleep in jiffies.
7148 https://trustedcomputinggroup.org/resource/pc-client-platform-tpm-profile-ptp-specification/
7186 local - Use the per CPU time stamp counter
7190 global - Event time stamps are synchronize across
7193 counter - Simple counting of events (1, 2, ..)
7197 uptime - Use jiffies as the time stamp.
7198 perf - Use the same clock that perf uses.
7199 mono - Use ktime_get_mono_fast_ns() for time stamps.
7200 mono_raw - Use ktime_get_raw_fast_ns() for time
7202 boot - Use ktime_get_boot_fast_ns() for time stamps.
7206 trace_event=[event-list]
7208 to facilitate early boot debugging. The event-list is a
7209 comma-separated list of trace events to enable. See
7220 trace_instance=[instance-info]
7245 traceoff - Have the tracing instance tracing disabled after it is created.
7246 traceprintk - Have trace_printk() write into this trace instance
7293 trace_options=[option-list]
7295 The option-list is a comma delimited list of options
7309 trace_trigger=[trigger-list]
7355 See Documentation/admin-guide/mm/transhuge.rst
7362 See Documentation/admin-guide/mm/transhuge.rst
7369 See Documentation/admin-guide/mm/transhuge.rst
7377 - "tpm"
7378 - "tee"
7379 - "caam"
7380 - "dcp"
7390 - "kernel"
7391 - the same value as trusted.source: "tpm" or "tee"
7392 - "default"
7413 high-resolution timer mode on older hardware, and in
7449 on - Enable TSX on the system. Although there are
7452 several previous speculation-related CVEs, and
7456 off - Disable TSX on the system. (Note that this
7464 auto - Disable TSX if X86_BUG_TAA is present,
7469 See Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7475 Similar to Micro-architectural Data Sampling (MDS)
7490 full - Enable TAA mitigation on vulnerable CPUs
7493 full,nosmt - Enable TAA mitigation and disable SMT on
7496 vulnerable to cross-thread TAA attacks.
7497 off - Unconditionally disable TAA mitigation
7499 On MDS-affected machines, tsx_async_abort=off can be
7511 Documentation/admin-guide/hw-vuln/tsx_async_abort.rst
7517 See also Documentation/input/devices/joystick-parport.rst
7519 udbg-immortal [PPC] When debugging early kernel crashes that
7525 Set number of hash buckets for UDP/UDP-Lite connections
7527 uhci-hcd.ignore_oc=
7529 Some badly-designed motherboards generate lots of
7554 unwind_debug [X86-64,EARLY]
7562 (default -1 = authorized (same as 1),
7568 for newly-detected USB devices (default 2). This
7596 [USB] Specifies timeout for the initial 64-byte
7603 [USB] A list of quirk entries to augment the built-in
7606 VendorID:ProductID:Flags. The IDs are 4-digit hex
7608 will change the built-in quirk; setting it if it is
7613 a 255-byte read);
7617 Set-Interface requests);
7636 (bInterval-1).
7674 usb-storage.delay_use=
7681 usb-storage.quirks=
7683 override the built-in unusual_devs list. List
7686 and Product ID values (4-digit hex numbers) and
7688 to a common usb-storage quirk flag as follows:
7730 medium is write-protected).
7739 1 - undefined instruction events
7740 2 - system calls
7741 4 - invalid data aborts
7742 8 - SIGSEGV faults
7743 16 - SIGBUS faults
7752 vdso32= [X86] Control the 32-bit vDSO
7753 vdso32=1: enable 32-bit VDSO
7754 vdso32=0 or vdso32=2: disable 32-bit VDSO
7764 dl_main: Assertion `(void *) ph->p_vaddr == _rtld_local._dl_sysinfo_dso' failed!
7795 vga= [BOOT,X86-32] Select a particular video mode
7797 Documentation/admin-guide/svga.rst.
7812 - Disable all of the above options
7836 vsyscall= [X86-64,EARLY]
7839 code). Most statically-linked binaries and older
7863 see vga-softcursor.rst. Default: 2 = underline.
7868 This is a 16-member array composed of values
7869 ranging from 0-255.
7874 This is a 16-member array composed of values
7875 ranging from 0-255.
7880 This is a 16-member array composed of values
7881 ranging from 0-255.
7886 Set system-wide default UTF-8 mode for all tty's.
7887 Default is 1, i.e. UTF-8 mode is enabled for all
7892 Format=<-1|0|1>
7893 Set system-wide default for whether a cursor
7894 is shown on new VTs. Default is -1,
7899 vt.italic= [VT] Default color for italic text; 0-15.
7902 vt.underline= [VT] Default color for underlined text; 0-15.
7906 see Documentation/watchdog/watchdog-parameters.rst
7907 or other driver-specific files in the
7921 Format: <cpu-list>
7942 Per-cpu work items which run for longer than this
7945 them from noticeably delaying other per-cpu work
7963 Per-cpu workqueues are generally preferred because
7965 locality; unfortunately, per-cpu workqueues tend to
7968 Enabling this makes the per-cpu workqueues which
7982 Documentation/core-api/workqueue.rst.
7995 forces round-robin CPU selection to flush out
8003 on - Enable writecombine, use WUC for ioremap_wc()
8004 off - Disable writecombine, use SUC for ioremap_wc()
8006 x2apic_phys [X86-64,APIC,EARLY] Use x2apic physical mode instead of
8010 xen_512gb_limit [KNL,X86-64,XEN]
8020 ide-disks -- unplug primary master IDE devices
8021 aux-ide-disks -- unplug non-primary-master IDE devices
8022 nics -- unplug network devices
8023 all -- unplug all emulated devices (NICs and IDE disks)
8024 unnecessary -- unplugging emulated devices is
8027 never -- do not unplug even if version check succeeds
8041 Select whether to always use non-faulting (safe) MSR
8061 xen_timer_slop= [X86-64,XEN,EARLY]
8086 preferred over the 2-level event handling, as it is
8103 xive.store-eoi=off [PPC]
8109 xhci-hcd.quirks [USB,KNL]