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