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