1# SPDX-License-Identifier: GPL-2.0 2config NIOS2 3 def_bool y 4 select ARCH_HAS_SYNC_DMA_FOR_CPU 5 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 6 select ARCH_NO_SWAP 7 select DMA_DIRECT_OPS 8 select TIMER_OF 9 select GENERIC_ATOMIC64 10 select GENERIC_CLOCKEVENTS 11 select GENERIC_CPU_DEVICES 12 select GENERIC_IRQ_PROBE 13 select GENERIC_IRQ_SHOW 14 select GENERIC_STRNCPY_FROM_USER 15 select GENERIC_STRNLEN_USER 16 select HAVE_ARCH_TRACEHOOK 17 select HAVE_ARCH_KGDB 18 select IRQ_DOMAIN 19 select MODULES_USE_ELF_RELA 20 select OF 21 select OF_EARLY_FLATTREE 22 select SOC_BUS 23 select SPARSE_IRQ 24 select USB_ARCH_HAS_HCD if USB_SUPPORT 25 select CPU_NO_EFFICIENT_FFS 26 27config GENERIC_CSUM 28 def_bool y 29 30config GENERIC_HWEIGHT 31 def_bool y 32 33config GENERIC_CALIBRATE_DELAY 34 def_bool y 35 36config NO_IOPORT_MAP 37 def_bool y 38 39config HAS_DMA 40 def_bool y 41 42config FPU 43 def_bool n 44 45config RWSEM_GENERIC_SPINLOCK 46 def_bool y 47 48config TRACE_IRQFLAGS_SUPPORT 49 def_bool n 50 51menu "Kernel features" 52 53source "kernel/Kconfig.hz" 54 55config FORCE_MAX_ZONEORDER 56 int "Maximum zone order" 57 range 9 20 58 default "11" 59 help 60 The kernel memory allocator divides physically contiguous memory 61 blocks into "zones", where each zone is a power of two number of 62 pages. This option selects the largest power of two that the kernel 63 keeps in the memory allocator. If you need to allocate very large 64 blocks of physically contiguous memory, then you may need to 65 increase this value. 66 67 This config option is actually maximum order plus one. For example, 68 a value of 11 means that the largest free memory block is 2^10 pages. 69 70endmenu 71 72source "arch/nios2/platform/Kconfig.platform" 73 74menu "Processor type and features" 75 76config MMU 77 def_bool y 78 79config NR_CPUS 80 int 81 default "1" 82 83config NIOS2_ALIGNMENT_TRAP 84 bool "Catch alignment trap" 85 default y 86 help 87 Nios II CPUs cannot fetch/store data which is not bus aligned, 88 i.e., a 2 or 4 byte fetch must start at an address divisible by 89 2 or 4. Any non-aligned load/store instructions will be trapped and 90 emulated in software if you say Y here, which has a performance 91 impact. 92 93comment "Boot options" 94 95config CMDLINE_BOOL 96 bool "Default bootloader kernel arguments" 97 default y 98 99config CMDLINE 100 string "Default kernel command string" 101 default "" 102 depends on CMDLINE_BOOL 103 help 104 On some platforms, there is currently no way for the boot loader to 105 pass arguments to the kernel. For these platforms, you can supply 106 some command-line options at build time by entering them here. In 107 other cases you can specify kernel args so that you don't have 108 to set them up in board prom initialization routines. 109 110config CMDLINE_FORCE 111 bool "Force default kernel command string" 112 depends on CMDLINE_BOOL 113 help 114 Set this to have arguments from the default kernel command string 115 override those passed by the boot loader. 116 117config NIOS2_CMDLINE_IGNORE_DTB 118 bool "Ignore kernel command string from DTB" 119 depends on CMDLINE_BOOL 120 depends on !CMDLINE_FORCE 121 default y 122 help 123 Set this to ignore the bootargs property from the devicetree's 124 chosen node and fall back to CMDLINE if nothing is passed. 125 126config NIOS2_PASS_CMDLINE 127 bool "Passed kernel command line from u-boot" 128 default n 129 help 130 Use bootargs env variable from u-boot for kernel command line. 131 will override "Default kernel command string". 132 Say N if you are unsure. 133 134config NIOS2_BOOT_LINK_OFFSET 135 hex "Link address offset for booting" 136 default "0x00500000" 137 help 138 This option allows you to set the link address offset of the zImage. 139 This can be useful if you are on a board which has a small amount of 140 memory. 141 142endmenu 143 144menu "Advanced setup" 145 146config ADVANCED_OPTIONS 147 bool "Prompt for advanced kernel configuration options" 148 149comment "Default settings for advanced configuration options are used" 150 depends on !ADVANCED_OPTIONS 151 152config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 153 bool "Set custom kernel MMU region base address" 154 depends on ADVANCED_OPTIONS 155 help 156 This option allows you to set the virtual address of the kernel MMU region. 157 158 Say N here unless you know what you are doing. 159 160config NIOS2_KERNEL_MMU_REGION_BASE 161 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 162 default "0x80000000" 163 help 164 This option allows you to set the virtual base address of the kernel MMU region. 165 166config NIOS2_KERNEL_REGION_BASE_BOOL 167 bool "Set custom kernel region base address" 168 depends on ADVANCED_OPTIONS 169 help 170 This option allows you to set the virtual address of the kernel region. 171 172 Say N here unless you know what you are doing. 173 174config NIOS2_KERNEL_REGION_BASE 175 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 176 default "0xc0000000" 177 178config NIOS2_IO_REGION_BASE_BOOL 179 bool "Set custom I/O region base address" 180 depends on ADVANCED_OPTIONS 181 help 182 This option allows you to set the virtual address of the I/O region. 183 184 Say N here unless you know what you are doing. 185 186config NIOS2_IO_REGION_BASE 187 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 188 default "0xe0000000" 189 190endmenu 191