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 select ARCH_DISCARD_MEMBLOCK 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 HAS_DMA 41 def_bool y 42 43config FPU 44 def_bool n 45 46config RWSEM_GENERIC_SPINLOCK 47 def_bool y 48 49config TRACE_IRQFLAGS_SUPPORT 50 def_bool n 51 52menu "Kernel features" 53 54source "kernel/Kconfig.hz" 55 56config FORCE_MAX_ZONEORDER 57 int "Maximum zone order" 58 range 9 20 59 default "11" 60 help 61 The kernel memory allocator divides physically contiguous memory 62 blocks into "zones", where each zone is a power of two number of 63 pages. This option selects the largest power of two that the kernel 64 keeps in the memory allocator. If you need to allocate very large 65 blocks of physically contiguous memory, then you may need to 66 increase this value. 67 68 This config option is actually maximum order plus one. For example, 69 a value of 11 means that the largest free memory block is 2^10 pages. 70 71endmenu 72 73source "arch/nios2/platform/Kconfig.platform" 74 75menu "Processor type and features" 76 77config MMU 78 def_bool y 79 80config NR_CPUS 81 int 82 default "1" 83 84config NIOS2_ALIGNMENT_TRAP 85 bool "Catch alignment trap" 86 default y 87 help 88 Nios II CPUs cannot fetch/store data which is not bus aligned, 89 i.e., a 2 or 4 byte fetch must start at an address divisible by 90 2 or 4. Any non-aligned load/store instructions will be trapped and 91 emulated in software if you say Y here, which has a performance 92 impact. 93 94comment "Boot options" 95 96config CMDLINE_BOOL 97 bool "Default bootloader kernel arguments" 98 default y 99 100config CMDLINE 101 string "Default kernel command string" 102 default "" 103 depends on CMDLINE_BOOL 104 help 105 On some platforms, there is currently no way for the boot loader to 106 pass arguments to the kernel. For these platforms, you can supply 107 some command-line options at build time by entering them here. In 108 other cases you can specify kernel args so that you don't have 109 to set them up in board prom initialization routines. 110 111config CMDLINE_FORCE 112 bool "Force default kernel command string" 113 depends on CMDLINE_BOOL 114 help 115 Set this to have arguments from the default kernel command string 116 override those passed by the boot loader. 117 118config NIOS2_CMDLINE_IGNORE_DTB 119 bool "Ignore kernel command string from DTB" 120 depends on CMDLINE_BOOL 121 depends on !CMDLINE_FORCE 122 default y 123 help 124 Set this to ignore the bootargs property from the devicetree's 125 chosen node and fall back to CMDLINE if nothing is passed. 126 127config NIOS2_PASS_CMDLINE 128 bool "Passed kernel command line from u-boot" 129 default n 130 help 131 Use bootargs env variable from u-boot for kernel command line. 132 will override "Default kernel command string". 133 Say N if you are unsure. 134 135config NIOS2_BOOT_LINK_OFFSET 136 hex "Link address offset for booting" 137 default "0x00500000" 138 help 139 This option allows you to set the link address offset of the zImage. 140 This can be useful if you are on a board which has a small amount of 141 memory. 142 143endmenu 144 145menu "Advanced setup" 146 147config ADVANCED_OPTIONS 148 bool "Prompt for advanced kernel configuration options" 149 150comment "Default settings for advanced configuration options are used" 151 depends on !ADVANCED_OPTIONS 152 153config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 154 bool "Set custom kernel MMU region base address" 155 depends on ADVANCED_OPTIONS 156 help 157 This option allows you to set the virtual address of the kernel MMU region. 158 159 Say N here unless you know what you are doing. 160 161config NIOS2_KERNEL_MMU_REGION_BASE 162 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 163 default "0x80000000" 164 help 165 This option allows you to set the virtual base address of the kernel MMU region. 166 167config NIOS2_KERNEL_REGION_BASE_BOOL 168 bool "Set custom kernel region base address" 169 depends on ADVANCED_OPTIONS 170 help 171 This option allows you to set the virtual address of the kernel region. 172 173 Say N here unless you know what you are doing. 174 175config NIOS2_KERNEL_REGION_BASE 176 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 177 default "0xc0000000" 178 179config NIOS2_IO_REGION_BASE_BOOL 180 bool "Set custom I/O region base address" 181 depends on ADVANCED_OPTIONS 182 help 183 This option allows you to set the virtual address of the I/O region. 184 185 Say N here unless you know what you are doing. 186 187config NIOS2_IO_REGION_BASE 188 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 189 default "0xe0000000" 190 191endmenu 192