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 HAVE_MEMBLOCK 27 select ARCH_DISCARD_MEMBLOCK 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 HAS_DMA 42 def_bool y 43 44config FPU 45 def_bool n 46 47config RWSEM_GENERIC_SPINLOCK 48 def_bool y 49 50config TRACE_IRQFLAGS_SUPPORT 51 def_bool n 52 53menu "Kernel features" 54 55source "kernel/Kconfig.hz" 56 57config FORCE_MAX_ZONEORDER 58 int "Maximum zone order" 59 range 9 20 60 default "11" 61 help 62 The kernel memory allocator divides physically contiguous memory 63 blocks into "zones", where each zone is a power of two number of 64 pages. This option selects the largest power of two that the kernel 65 keeps in the memory allocator. If you need to allocate very large 66 blocks of physically contiguous memory, then you may need to 67 increase this value. 68 69 This config option is actually maximum order plus one. For example, 70 a value of 11 means that the largest free memory block is 2^10 pages. 71 72endmenu 73 74source "arch/nios2/platform/Kconfig.platform" 75 76menu "Processor type and features" 77 78config MMU 79 def_bool y 80 81config NR_CPUS 82 int 83 default "1" 84 85config NIOS2_ALIGNMENT_TRAP 86 bool "Catch alignment trap" 87 default y 88 help 89 Nios II CPUs cannot fetch/store data which is not bus aligned, 90 i.e., a 2 or 4 byte fetch must start at an address divisible by 91 2 or 4. Any non-aligned load/store instructions will be trapped and 92 emulated in software if you say Y here, which has a performance 93 impact. 94 95comment "Boot options" 96 97config CMDLINE_BOOL 98 bool "Default bootloader kernel arguments" 99 default y 100 101config CMDLINE 102 string "Default kernel command string" 103 default "" 104 depends on CMDLINE_BOOL 105 help 106 On some platforms, there is currently no way for the boot loader to 107 pass arguments to the kernel. For these platforms, you can supply 108 some command-line options at build time by entering them here. In 109 other cases you can specify kernel args so that you don't have 110 to set them up in board prom initialization routines. 111 112config CMDLINE_FORCE 113 bool "Force default kernel command string" 114 depends on CMDLINE_BOOL 115 help 116 Set this to have arguments from the default kernel command string 117 override those passed by the boot loader. 118 119config NIOS2_CMDLINE_IGNORE_DTB 120 bool "Ignore kernel command string from DTB" 121 depends on CMDLINE_BOOL 122 depends on !CMDLINE_FORCE 123 default y 124 help 125 Set this to ignore the bootargs property from the devicetree's 126 chosen node and fall back to CMDLINE if nothing is passed. 127 128config NIOS2_PASS_CMDLINE 129 bool "Passed kernel command line from u-boot" 130 default n 131 help 132 Use bootargs env variable from u-boot for kernel command line. 133 will override "Default kernel command string". 134 Say N if you are unsure. 135 136config NIOS2_BOOT_LINK_OFFSET 137 hex "Link address offset for booting" 138 default "0x00500000" 139 help 140 This option allows you to set the link address offset of the zImage. 141 This can be useful if you are on a board which has a small amount of 142 memory. 143 144endmenu 145 146menu "Advanced setup" 147 148config ADVANCED_OPTIONS 149 bool "Prompt for advanced kernel configuration options" 150 151comment "Default settings for advanced configuration options are used" 152 depends on !ADVANCED_OPTIONS 153 154config NIOS2_KERNEL_MMU_REGION_BASE_BOOL 155 bool "Set custom kernel MMU region base address" 156 depends on ADVANCED_OPTIONS 157 help 158 This option allows you to set the virtual address of the kernel MMU region. 159 160 Say N here unless you know what you are doing. 161 162config NIOS2_KERNEL_MMU_REGION_BASE 163 hex "Virtual base address of the kernel MMU region " if NIOS2_KERNEL_MMU_REGION_BASE_BOOL 164 default "0x80000000" 165 help 166 This option allows you to set the virtual base address of the kernel MMU region. 167 168config NIOS2_KERNEL_REGION_BASE_BOOL 169 bool "Set custom kernel region base address" 170 depends on ADVANCED_OPTIONS 171 help 172 This option allows you to set the virtual address of the kernel region. 173 174 Say N here unless you know what you are doing. 175 176config NIOS2_KERNEL_REGION_BASE 177 hex "Virtual base address of the kernel region " if NIOS2_KERNEL_REGION_BASE_BOOL 178 default "0xc0000000" 179 180config NIOS2_IO_REGION_BASE_BOOL 181 bool "Set custom I/O region base address" 182 depends on ADVANCED_OPTIONS 183 help 184 This option allows you to set the virtual address of the I/O region. 185 186 Say N here unless you know what you are doing. 187 188config NIOS2_IO_REGION_BASE 189 hex "Virtual base address of the I/O region" if NIOS2_IO_REGION_BASE_BOOL 190 default "0xe0000000" 191 192endmenu 193