1config MICROBLAZE 2 def_bool y 3 select ARCH_NO_SWAP 4 select ARCH_HAS_DMA_COHERENT_TO_PFN if MMU 5 select ARCH_HAS_GCOV_PROFILE_ALL 6 select ARCH_HAS_SYNC_DMA_FOR_CPU 7 select ARCH_HAS_SYNC_DMA_FOR_DEVICE 8 select ARCH_MIGHT_HAVE_PC_PARPORT 9 select ARCH_NO_COHERENT_DMA_MMAP if !MMU 10 select ARCH_WANT_IPC_PARSE_VERSION 11 select BUILDTIME_EXTABLE_SORT 12 select TIMER_OF 13 select CLONE_BACKWARDS3 14 select COMMON_CLK 15 select DMA_DIRECT_OPS 16 select GENERIC_ATOMIC64 17 select GENERIC_CLOCKEVENTS 18 select GENERIC_CPU_DEVICES 19 select GENERIC_IDLE_POLL_SETUP 20 select GENERIC_IRQ_PROBE 21 select GENERIC_IRQ_SHOW 22 select GENERIC_PCI_IOMAP 23 select GENERIC_SCHED_CLOCK 24 select HAVE_ARCH_HASH 25 select HAVE_ARCH_KGDB 26 select HAVE_DEBUG_KMEMLEAK 27 select HAVE_DYNAMIC_FTRACE 28 select HAVE_FTRACE_MCOUNT_RECORD 29 select HAVE_FUNCTION_GRAPH_TRACER 30 select HAVE_FUNCTION_TRACER 31 select HAVE_MEMBLOCK_NODE_MAP 32 select HAVE_OPROFILE 33 select HAVE_PCI 34 select IRQ_DOMAIN 35 select XILINX_INTC 36 select MODULES_USE_ELF_RELA 37 select OF 38 select OF_EARLY_FLATTREE 39 select TRACING_SUPPORT 40 select VIRT_TO_BUS 41 select CPU_NO_EFFICIENT_FFS 42 43# Endianness selection 44choice 45 prompt "Endianness selection" 46 default CPU_LITTLE_ENDIAN 47 help 48 microblaze architectures can be configured for either little or 49 big endian formats. Be sure to select the appropriate mode. 50 51config CPU_BIG_ENDIAN 52 bool "Big endian" 53 54config CPU_LITTLE_ENDIAN 55 bool "Little endian" 56 57endchoice 58 59config RWSEM_GENERIC_SPINLOCK 60 def_bool y 61 62config ZONE_DMA 63 def_bool y 64 65config RWSEM_XCHGADD_ALGORITHM 66 bool 67 68config ARCH_HAS_ILOG2_U32 69 def_bool n 70 71config ARCH_HAS_ILOG2_U64 72 def_bool n 73 74config GENERIC_HWEIGHT 75 def_bool y 76 77config GENERIC_CALIBRATE_DELAY 78 def_bool y 79 80config GENERIC_CSUM 81 def_bool y 82 83config STACKTRACE_SUPPORT 84 def_bool y 85 86config LOCKDEP_SUPPORT 87 def_bool y 88 89source "arch/microblaze/Kconfig.platform" 90 91menu "Processor type and features" 92 93source "kernel/Kconfig.hz" 94 95config MMU 96 bool "MMU support" 97 default n 98 99comment "Boot options" 100 101config CMDLINE_BOOL 102 bool "Default bootloader kernel arguments" 103 104config CMDLINE 105 string "Default kernel command string" 106 depends on CMDLINE_BOOL 107 default "console=ttyUL0,115200" 108 help 109 On some architectures there is currently no way for the boot loader 110 to pass arguments to the kernel. For these architectures, you should 111 supply some command-line options at build time by entering them 112 here. 113 114config CMDLINE_FORCE 115 bool "Force default kernel command string" 116 depends on CMDLINE_BOOL 117 default n 118 help 119 Set this to have arguments from the default kernel command string 120 override those passed by the boot loader. 121 122config SECCOMP 123 bool "Enable seccomp to safely compute untrusted bytecode" 124 depends on PROC_FS 125 default y 126 help 127 This kernel feature is useful for number crunching applications 128 that may need to compute untrusted bytecode during their 129 execution. By using pipes or other transports made available to 130 the process as file descriptors supporting the read/write 131 syscalls, it's possible to isolate those applications in 132 their own address space using seccomp. Once seccomp is 133 enabled via /proc/<pid>/seccomp, it cannot be disabled 134 and the task is only allowed to execute a few safe syscalls 135 defined by each seccomp mode. 136 137 If unsure, say Y. Only embedded should say N here. 138 139endmenu 140 141menu "Kernel features" 142 143config NR_CPUS 144 int 145 default "1" 146 147config ADVANCED_OPTIONS 148 bool "Prompt for advanced kernel configuration options" 149 help 150 This option will enable prompting for a variety of advanced kernel 151 configuration options. These options can cause the kernel to not 152 work if they are set incorrectly, but can be used to optimize certain 153 aspects of kernel memory management. 154 155 Unless you know what you are doing, say N here. 156 157comment "Default settings for advanced configuration options are used" 158 depends on !ADVANCED_OPTIONS 159 160config XILINX_UNCACHED_SHADOW 161 bool "Are you using uncached shadow for RAM ?" 162 depends on ADVANCED_OPTIONS && !MMU 163 default n 164 help 165 This is needed to be able to allocate uncachable memory regions. 166 The feature requires the design to define the RAM memory controller 167 window to be twice as large as the actual physical memory. 168 169config HIGHMEM 170 bool "High memory support" 171 depends on MMU 172 help 173 The address space of Microblaze processors is only 4 Gigabytes large 174 and it has to accommodate user address space, kernel address 175 space as well as some memory mapped IO. That means that, if you 176 have a large amount of physical memory and/or IO, not all of the 177 memory can be "permanently mapped" by the kernel. The physical 178 memory that is not permanently mapped is called "high memory". 179 180 If unsure, say n. 181 182config LOWMEM_SIZE_BOOL 183 bool "Set maximum low memory" 184 depends on ADVANCED_OPTIONS && MMU 185 help 186 This option allows you to set the maximum amount of memory which 187 will be used as "low memory", that is, memory which the kernel can 188 access directly, without having to set up a kernel virtual mapping. 189 This can be useful in optimizing the layout of kernel virtual 190 memory. 191 192 Say N here unless you know what you are doing. 193 194config LOWMEM_SIZE 195 hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL 196 default "0x30000000" 197 198config MANUAL_RESET_VECTOR 199 hex "Microblaze reset vector address setup" 200 default "0x0" 201 help 202 Set this option to have the kernel override the CPU Reset vector. 203 If zero, no change will be made to the MicroBlaze reset vector at 204 address 0x0. 205 If non-zero, a jump instruction to this address, will be written 206 to the reset vector at address 0x0. 207 If you are unsure, set it to default value 0x0. 208 209config KERNEL_START_BOOL 210 bool "Set custom kernel base address" 211 depends on ADVANCED_OPTIONS 212 help 213 This option allows you to set the kernel virtual address at which 214 the kernel will map low memory (the kernel image will be linked at 215 this address). This can be useful in optimizing the virtual memory 216 layout of the system. 217 218 Say N here unless you know what you are doing. 219 220config KERNEL_START 221 hex "Virtual address of kernel base" if KERNEL_START_BOOL 222 default "0xc0000000" if MMU 223 default KERNEL_BASE_ADDR if !MMU 224 225config TASK_SIZE_BOOL 226 bool "Set custom user task size" 227 depends on ADVANCED_OPTIONS && MMU 228 help 229 This option allows you to set the amount of virtual address space 230 allocated to user tasks. This can be useful in optimizing the 231 virtual memory layout of the system. 232 233 Say N here unless you know what you are doing. 234 235config TASK_SIZE 236 hex "Size of user task space" if TASK_SIZE_BOOL 237 default "0x80000000" 238 239choice 240 prompt "Page size" 241 default MICROBLAZE_4K_PAGES 242 depends on ADVANCED_OPTIONS && !MMU 243 help 244 Select the kernel logical page size. Increasing the page size 245 will reduce software overhead at each page boundary, allow 246 hardware prefetch mechanisms to be more effective, and allow 247 larger dma transfers increasing IO efficiency and reducing 248 overhead. However the utilization of memory will increase. 249 For example, each cached file will using a multiple of the 250 page size to hold its contents and the difference between the 251 end of file and the end of page is wasted. 252 253 If unsure, choose 4K_PAGES. 254 255config MICROBLAZE_4K_PAGES 256 bool "4k page size" 257 258config MICROBLAZE_16K_PAGES 259 bool "16k page size" 260 261config MICROBLAZE_64K_PAGES 262 bool "64k page size" 263 264endchoice 265 266endmenu 267 268menu "Bus Options" 269 270config PCI_DOMAINS 271 def_bool PCI 272 273config PCI_DOMAINS_GENERIC 274 def_bool PCI_DOMAINS 275 276config PCI_SYSCALL 277 def_bool PCI 278 279config PCI_XILINX 280 bool "Xilinx PCI host bridge support" 281 depends on PCI 282 283endmenu 284