1# SPDX-License-Identifier: GPL-2.0 2config NIOS2 3 def_bool y 4 select ARCH_32BIT_OFF_T 5 select ARCH_HAS_SYNC_DMA_FOR_CPU 6 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 7 select ARCH_HAS_UNCACHED_SEGMENT 8 select ARCH_NO_SWAP 9 select COMMON_CLK 10 select TIMER_OF 11 select GENERIC_ATOMIC64 12 select GENERIC_CLOCKEVENTS 13 select GENERIC_CPU_DEVICES 14 select GENERIC_IRQ_PROBE 15 select GENERIC_IRQ_SHOW 16 select GENERIC_STRNCPY_FROM_USER 17 select GENERIC_STRNLEN_USER 18 select HAVE_ARCH_TRACEHOOK 19 select HAVE_ARCH_KGDB 20 select IRQ_DOMAIN 21 select MODULES_USE_ELF_RELA 22 select OF 23 select OF_EARLY_FLATTREE 24 select SOC_BUS 25 select SPARSE_IRQ 26 select USB_ARCH_HAS_HCD if USB_SUPPORT 27 select CPU_NO_EFFICIENT_FFS 28 select MMU_GATHER_NO_RANGE if MMU 29 30config GENERIC_CSUM 31 def_bool y 32 33config GENERIC_HWEIGHT 34 def_bool y 35 36config GENERIC_CALIBRATE_DELAY 37 def_bool y 38 39config NO_IOPORT_MAP 40 def_bool y 41 42config FPU 43 def_bool n 44 45config TRACE_IRQFLAGS_SUPPORT 46 def_bool n 47 48menu "Kernel features" 49 50source "kernel/Kconfig.hz" 51 52config FORCE_MAX_ZONEORDER 53 int "Maximum zone order" 54 range 9 20 55 default "11" 56 help 57 The kernel memory allocator divides physically contiguous memory 58 blocks into "zones", where each zone is a power of two number of 59 pages. This option selects the largest power of two that the kernel 60 keeps in the memory allocator. If you need to allocate very large 61 blocks of physically contiguous memory, then you may need to 62 increase this value. 63 64 This config option is actually maximum order plus one. For example, 65 a value of 11 means that the largest free memory block is 2^10 pages. 66 67endmenu 68 69source "arch/nios2/platform/Kconfig.platform" 70 71menu "Processor type and features" 72 73config MMU 74 def_bool y 75 76config NR_CPUS 77 int 78 default "1" 79 80config NIOS2_ALIGNMENT_TRAP 81 bool "Catch alignment trap" 82 default y 83 help 84 Nios II CPUs cannot fetch/store data which is not bus aligned, 85 i.e., a 2 or 4 byte fetch must start at an address divisible by 86 2 or 4. Any non-aligned load/store instructions will be trapped and 87 emulated in software if you say Y here, which has a performance 88 impact. 89 90comment "Boot options" 91 92config CMDLINE_BOOL 93 bool "Default bootloader kernel arguments" 94 default y 95 96config CMDLINE 97 string "Default kernel command string" 98 default "" 99 depends on CMDLINE_BOOL 100 help 101 On some platforms, there is currently no way for the boot loader to 102 pass arguments to the kernel. For these platforms, you can supply 103 some command-line options at build time by entering them here. In 104 other cases you can specify kernel args so that you don't have 105 to set them up in board prom initialization routines. 106 107config CMDLINE_FORCE 108 bool "Force default kernel command string" 109 depends on CMDLINE_BOOL 110 help 111 Set this to have arguments from the default kernel command string 112 override those passed by the boot loader. 113 114config NIOS2_CMDLINE_IGNORE_DTB 115 bool "Ignore kernel command string from DTB" 116 depends on CMDLINE_BOOL 117 depends on !CMDLINE_FORCE 118 default y 119 help 120 Set this to ignore the bootargs property from the devicetree's 121 chosen node and fall back to CMDLINE if nothing is passed. 122 123config NIOS2_PASS_CMDLINE 124 bool "Passed kernel command line from u-boot" 125 help 126 Use bootargs env variable from u-boot for kernel command line. 127 will override "Default kernel command string". 128 Say N if you are unsure. 129 130config NIOS2_BOOT_LINK_OFFSET 131 hex "Link address offset for booting" 132 default "0x00500000" 133 help 134 This option allows you to set the link address offset of the zImage. 135 This can be useful if you are on a board which has a small amount of 136 memory. 137 138endmenu 139 140menu "Advanced setup" 141 142config ADVANCED_OPTIONS 143 bool "Prompt for advanced kernel configuration options" 144 145comment "Default settings for advanced configuration options are used" 146 depends on !ADVANCED_OPTIONS 147 148config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 149 bool "Set custom kernel MMU region base address" 150 depends on ADVANCED_OPTIONS 151 help 152 This option allows you to set the virtual address of the kernel MMU region. 153 154 Say N here unless you know what you are doing. 155 156config NIOS2_KERNEL_MMU_REGION_BASE 157 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 158 default "0x80000000" 159 help 160 This option allows you to set the virtual base address of the kernel MMU region. 161 162config NIOS2_KERNEL_REGION_BASE_BOOL 163 bool "Set custom kernel region base address" 164 depends on ADVANCED_OPTIONS 165 help 166 This option allows you to set the virtual address of the kernel region. 167 168 Say N here unless you know what you are doing. 169 170config NIOS2_KERNEL_REGION_BASE 171 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 172 default "0xc0000000" 173 174config NIOS2_IO_REGION_BASE_BOOL 175 bool "Set custom I/O region base address" 176 depends on ADVANCED_OPTIONS 177 help 178 This option allows you to set the virtual address of the I/O region. 179 180 Say N here unless you know what you are doing. 181 182config NIOS2_IO_REGION_BASE 183 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 184 default "0xe0000000" 185 186endmenu 187