2 # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com)
4 # This program is free software; you can redistribute it and/or modify
5 # it under the terms of the GNU General Public License version 2 as
6 # published by the Free Software Foundation.
11 select ARCH_NO_VIRT_TO_BUS
12 select CLONE_BACKWARDS
13 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
14 select DEVTMPFS if !INITRAMFS_SOURCE=""
15 select GENERIC_ATOMIC64
16 select GENERIC_CLOCKEVENTS
17 select GENERIC_FIND_FIRST_BIT
18 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
19 select GENERIC_IRQ_SHOW
20 select GENERIC_KERNEL_EXECVE
21 select GENERIC_KERNEL_THREAD
22 select GENERIC_PENDING_IRQ if SMP
23 select GENERIC_SIGALTSTACK
24 select GENERIC_SMP_IDLE_THREAD
25 select HAVE_GENERIC_HARDIRQS
26 select MODULES_USE_ELF_RELA
28 config SCHED_OMIT_FRAME_POINTER
34 config RWSEM_GENERIC_SPINLOCK
37 config ARCH_FLATMEM_ENABLE
46 config GENERIC_CALIBRATE_DELAY
49 config GENERIC_HWEIGHT
55 config HAVE_LATENCYTOP_SUPPORT
62 source "kernel/Kconfig.freezer"
64 menu "ARC Architecture Configuration"
68 default ARC_PLAT_FPGA_LEGACY
70 config ARC_PLAT_FPGA_LEGACY
71 bool "\"Legacy\" ARC FPGA dev platform"
73 Support for ARC development platforms, provided by Synopsys.
74 These are based on FPGA or ISS. e.g.
79 #New platform adds here
82 menu "ARC CPU Configuration"
91 Support for ARC750 core
95 select ARC_CPU_REL_4_10
97 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
98 This core has a bunch of cool new features:
99 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
100 Shared Address Spaces (for sharing TLB entires in MMU)
101 -Caches: New Prog Model, Region Flush
102 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
106 config CPU_BIG_ENDIAN
107 bool "Enable Big Endian Mode"
110 Build kernel for Big Endian Mode of ARC CPU
113 bool "Enable Cache Support"
118 config ARC_CACHE_LINE_SHIFT
119 int "Cache Line Length (as power of 2)"
123 Starting with ARC700 4.9, Cache line length is configurable,
124 This option specifies "N", with Line-len = 2 power N
125 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
126 Linux only supports same line lengths for I and D caches.
128 config ARC_HAS_ICACHE
129 bool "Use Instruction Cache"
132 config ARC_HAS_DCACHE
133 bool "Use Data Cache"
136 config ARC_CACHE_PAGES
137 bool "Per Page Cache Control"
139 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
141 This can be used to over-ride the global I/D Cache Enable on a
142 per-page basis (but only for pages accessed via MMU such as
143 Kernel Virtual address or User Virtual Address)
144 TLB entries have a per-page Cache Enable Bit.
145 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
146 Global DISABLE + Per Page ENABLE won't work
150 config ARC_HAS_HW_MPY
151 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
154 Influences how gcc generates code for MPY operations.
155 If enabled, MPYxx insns are generated, provided by Standard/XMAC
156 Multipler. Otherwise software multipy lib is used
159 prompt "ARC700 MMU Version"
160 default ARC_MMU_V3 if ARC_CPU_770
161 default ARC_MMU_V2 if ARC_CPU_750D
171 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
172 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
176 depends on ARC_CPU_770
178 Introduced with ARC700 4.10: New Features
179 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
180 Shared Address Spaces (SASID)
186 prompt "MMU Page Size"
187 default ARC_PAGE_SIZE_8K
189 config ARC_PAGE_SIZE_8K
192 Choose between 8k vs 16k
194 config ARC_PAGE_SIZE_16K
196 depends on ARC_MMU_V3
198 config ARC_PAGE_SIZE_4K
200 depends on ARC_MMU_V3
204 config ARC_FPU_SAVE_RESTORE
205 bool "Enable FPU state persistence across context switch"
208 Double Precision Floating Point unit had dedictaed regs which
209 need to be saved/restored across context-switch.
210 Note that ARC FPU is overly simplistic, unlike say x86, which has
211 hardware pieces to allow software to conditionally save/restore,
212 based on actual usage of FPU by a task. Thus our implemn does
213 this for all tasks in system.
215 menuconfig ARC_CPU_REL_4_10
216 bool "Enable support for Rel 4.10 features"
219 -ARC770 (and dependent features) enabled
220 -ARC750 also shares some of the new features with 770
223 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
225 depends on ARC_CPU_770
226 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics
227 depends on !SMP || ARC_HAS_COH_LLSC
230 bool "Insn: SWAPE (endian-swap)"
232 depends on ARC_CPU_REL_4_10
235 bool "Insn: RTSC (64-bit r/o cycle counter)"
237 depends on ARC_CPU_REL_4_10
239 endmenu # "ARC CPU Configuration"
241 menu "Platform Board Configuration"
243 source "arch/arc/plat-arcfpga/Kconfig"
245 #New platform adds here
248 int "Clk speed in Hz"
251 config LINUX_LINK_BASE
252 hex "Linux Link Address"
255 ARC700 divides the 32 bit phy address space into two equal halves
256 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
257 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
258 Typically Linux kernel is linked at the start of untransalted addr,
259 hence the default value of 0x8zs.
260 However some customers have peripherals mapped at this addr, so
261 Linux needs to be scooted a bit.
262 If you don't know what the above means, leave this setting alone.
264 config ARC_PLAT_SDRAM_SIZE
268 Implies the amount of SDRAM/DRAM Linux is going to claim/own.
269 The actual memory itself could be larger than this number. But for
270 all software purposes, this is the amt of memory.
272 endmenu # "Platform Board Configuration"
274 config ARC_STACK_NONEXEC
275 bool "Make stack non-executable"
278 To disable the execute permissions of stack/heap of processes
279 which are enabled by default.
282 int "Timer Frequency"
289 config ARC_DBG_TLB_PARANOIA
290 bool "Paranoia Checks in Low Level TLB Handlers"
294 config ARC_DBG_TLB_MISS_COUNT
295 bool "Profile TLB Misses"
300 Counts number of I and D TLB Misses and exports them via Debugfs
301 The counters can be cleared via Debugfs as well
304 string "Kernel command line to built-in"
305 default "print-fatal-signals=1"
307 The default command line which will be appended to the optional
308 u-boot provided command line (see below)
311 bool "Support U-boot kernel command line passing"
314 If you are using U-boot (www.denx.de) and wish to pass the kernel
315 command line from the U-boot environment to the Linux kernel then
316 switch this option on.
317 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
318 to it. kernel startup code will copy the string into cmdline buffer
319 and also append CONFIG_CMDLINE.
321 source "kernel/Kconfig.preempt"
323 endmenu # "ARC Architecture Configuration"
327 source "drivers/Kconfig"
329 source "arch/arc/Kconfig.debug"
330 source "security/Kconfig"
331 source "crypto/Kconfig"