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 CLONE_BACKWARDS
12 # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev
13 select DEVTMPFS if !INITRAMFS_SOURCE=""
14 select GENERIC_ATOMIC64
15 select GENERIC_CLOCKEVENTS
16 select GENERIC_FIND_FIRST_BIT
17 # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP
18 select GENERIC_IRQ_SHOW
19 select GENERIC_PENDING_IRQ if SMP
20 select GENERIC_SMP_IDLE_THREAD
22 select HAVE_ARCH_TRACEHOOK
23 select HAVE_IOREMAP_PROT
25 select HAVE_KRETPROBES
27 select HAVE_MOD_ARCH_SPECIFIC if ARC_DW2_UNWIND
29 select HAVE_PERF_EVENTS
31 select MODULES_USE_ELF_RELA
34 select OF_EARLY_FLATTREE
35 select PERF_USE_VMALLOC
36 select HAVE_DEBUG_STACKOVERFLOW
38 config TRACE_IRQFLAGS_SUPPORT
41 config LOCKDEP_SUPPORT
44 config SCHED_OMIT_FRAME_POINTER
50 config RWSEM_GENERIC_SPINLOCK
53 config ARCH_FLATMEM_ENABLE
62 config GENERIC_CALIBRATE_DELAY
65 config GENERIC_HWEIGHT
68 config STACKTRACE_SUPPORT
72 config HAVE_LATENCYTOP_SUPPORT
79 source "kernel/Kconfig.freezer"
81 menu "ARC Architecture Configuration"
83 menu "ARC Platform/SoC/Board"
85 source "arch/arc/plat-arcfpga/Kconfig"
86 source "arch/arc/plat-tb10x/Kconfig"
87 #New platform adds here
91 menu "ARC CPU Configuration"
100 Support for ARC750 core
104 select ARC_CPU_REL_4_10
106 Support for ARC770 core introduced with Rel 4.10 (Summer 2011)
107 This core has a bunch of cool new features:
108 -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4)
109 Shared Address Spaces (for sharing TLB entires in MMU)
110 -Caches: New Prog Model, Region Flush
111 -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr
115 config CPU_BIG_ENDIAN
116 bool "Enable Big Endian Mode"
119 Build kernel for Big Endian Mode of ARC CPU
121 # If a platform can't work with 0x8000_0000 based dma_addr_t
122 config ARC_PLAT_NEEDS_CPU_TO_DMA
126 bool "Symmetric Multi-Processing (Incomplete)"
129 This enables support for systems with more than one CPU. If you have
130 a system with only one CPU, like most personal computers, say N. If
131 you have a system with more than one CPU, say Y.
135 config ARC_HAS_COH_CACHES
138 config ARC_HAS_REENTRANT_IRQ_LV2
144 int "Maximum number of CPUs (2-4096)"
150 bool "Enable Cache Support"
152 # if SMP, cache enabled ONLY if ARC implementation has cache coherency
153 depends on !SMP || ARC_HAS_COH_CACHES
157 config ARC_CACHE_LINE_SHIFT
158 int "Cache Line Length (as power of 2)"
162 Starting with ARC700 4.9, Cache line length is configurable,
163 This option specifies "N", with Line-len = 2 power N
164 So line lengths of 32, 64, 128 are specified by 5,6,7, respectively
165 Linux only supports same line lengths for I and D caches.
167 config ARC_HAS_ICACHE
168 bool "Use Instruction Cache"
171 config ARC_HAS_DCACHE
172 bool "Use Data Cache"
175 config ARC_CACHE_PAGES
176 bool "Per Page Cache Control"
178 depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE
180 This can be used to over-ride the global I/D Cache Enable on a
181 per-page basis (but only for pages accessed via MMU such as
182 Kernel Virtual address or User Virtual Address)
183 TLB entries have a per-page Cache Enable Bit.
184 Note that Global I/D ENABLE + Per Page DISABLE works but corollary
185 Global DISABLE + Per Page ENABLE won't work
187 config ARC_CACHE_VIPT_ALIASING
188 bool "Support VIPT Aliasing D$"
189 depends on ARC_HAS_DCACHE
197 Single Cycle RAMS to store Fast Path Code
201 int "ICCM Size in KB"
203 depends on ARC_HAS_ICCM
208 Single Cycle RAMS to store Fast Path Data
212 int "DCCM Size in KB"
214 depends on ARC_HAS_DCCM
217 hex "DCCM map address"
219 depends on ARC_HAS_DCCM
221 config ARC_HAS_HW_MPY
222 bool "Use Hardware Multiplier (Normal or Faster XMAC)"
225 Influences how gcc generates code for MPY operations.
226 If enabled, MPYxx insns are generated, provided by Standard/XMAC
227 Multipler. Otherwise software multipy lib is used
230 prompt "ARC700 MMU Version"
231 default ARC_MMU_V3 if ARC_CPU_770
232 default ARC_MMU_V2 if ARC_CPU_750D
242 Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio
243 when 2 D-TLB and 1 I-TLB entries index into same 2way set.
247 depends on ARC_CPU_770
249 Introduced with ARC700 4.10: New Features
250 Variable Page size (1k-16k), var JTLB size 128 x (2 or 4)
251 Shared Address Spaces (SASID)
257 prompt "MMU Page Size"
258 default ARC_PAGE_SIZE_8K
260 config ARC_PAGE_SIZE_8K
263 Choose between 8k vs 16k
265 config ARC_PAGE_SIZE_16K
267 depends on ARC_MMU_V3
269 config ARC_PAGE_SIZE_4K
271 depends on ARC_MMU_V3
275 config ARC_COMPACT_IRQ_LEVELS
276 bool "ARCompact IRQ Priorities: High(2)/Low(1)"
278 # Timer HAS to be high priority, for any other high priority config
280 # if SMP, LV2 enabled ONLY if ARC implementation has LV2 re-entrancy
281 depends on !SMP || ARC_HAS_REENTRANT_IRQ_LV2
283 if ARC_COMPACT_IRQ_LEVELS
296 config ARC_FPU_SAVE_RESTORE
297 bool "Enable FPU state persistence across context switch"
300 Double Precision Floating Point unit had dedictaed regs which
301 need to be saved/restored across context-switch.
302 Note that ARC FPU is overly simplistic, unlike say x86, which has
303 hardware pieces to allow software to conditionally save/restore,
304 based on actual usage of FPU by a task. Thus our implemn does
305 this for all tasks in system.
310 menuconfig ARC_CPU_REL_4_10
311 bool "Enable support for Rel 4.10 features"
314 -ARC770 (and dependent features) enabled
315 -ARC750 also shares some of the new features with 770
318 bool "Insn: LLOCK/SCOND (efficient atomic ops)"
320 depends on ARC_CPU_770 && !ARC_CANT_LLSC
323 bool "Insn: SWAPE (endian-swap)"
325 depends on ARC_CPU_REL_4_10
328 bool "Insn: RTSC (64-bit r/o cycle counter)"
330 depends on ARC_CPU_REL_4_10
333 endmenu # "ARC CPU Configuration"
335 config LINUX_LINK_BASE
336 hex "Linux Link Address"
339 ARC700 divides the 32 bit phy address space into two equal halves
340 -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU
341 -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel
342 Typically Linux kernel is linked at the start of untransalted addr,
343 hence the default value of 0x8zs.
344 However some customers have peripherals mapped at this addr, so
345 Linux needs to be scooted a bit.
346 If you don't know what the above means, leave this setting alone.
348 config ARC_CURR_IN_REG
349 bool "Dedicate Register r25 for current_task pointer"
352 This reserved Register R25 to point to Current Task in
353 kernel mode. This saves memory access for each such access
356 config ARC_MISALIGN_ACCESS
357 bool "Emulate unaligned memory access (userspace only)"
359 select SYSCTL_ARCH_UNALIGN_NO_WARN
360 select SYSCTL_ARCH_UNALIGN_ALLOW
362 This enables misaligned 16 & 32 bit memory access from user space.
363 Use ONLY-IF-ABS-NECESSARY as it will be very slow and also can hide
364 potential bugs in code
367 int "Timer Frequency"
370 config ARC_METAWARE_HLINK
371 bool "Support for Metaware debugger assisted Host access"
374 This options allows a Linux userland apps to directly access
375 host file system (open/creat/read/write etc) with help from
376 Metaware Debugger. This can come in handy for Linux-host communication
377 when there is no real usable peripheral such as EMAC.
383 config ARC_DW2_UNWIND
384 bool "Enable DWARF specific kernel stack unwind"
389 Compiles the kernel with DWARF unwind information and can be used
390 to get stack backtraces.
392 If you say Y here the resulting kernel image will be slightly larger
393 but not slower, and it will give very useful debugging information.
394 If you don't debug the kernel, you can say N, but we may not be able
395 to solve problems without frame unwind information
397 config ARC_DBG_TLB_PARANOIA
398 bool "Paranoia Checks in Low Level TLB Handlers"
402 config ARC_DBG_TLB_MISS_COUNT
403 bool "Profile TLB Misses"
408 Counts number of I and D TLB Misses and exports them via Debugfs
409 The counters can be cleared via Debugfs as well
412 bool "Support U-boot kernel command line passing"
415 If you are using U-boot (www.denx.de) and wish to pass the kernel
416 command line from the U-boot environment to the Linux kernel then
417 switch this option on.
418 ARC U-boot will setup the cmdline in RAM/flash and set r2 to point
419 to it. kernel startup code will append this to DeviceTree
420 /bootargs provided cmdline args.
422 config ARC_BUILTIN_DTB_NAME
423 string "Built in DTB"
425 Set the name of the DTB to embed in the vmlinux binary
426 Leaving it blank selects the minimal "skeleton" dtb
428 source "kernel/Kconfig.preempt"
430 menu "Executable file formats"
431 source "fs/Kconfig.binfmt"
434 endmenu # "ARC Architecture Configuration"
438 source "drivers/Kconfig"
440 source "arch/arc/Kconfig.debug"
441 source "security/Kconfig"
442 source "crypto/Kconfig"