1 comment "Processor Type"
7 # Select CPU types depending on the architecture selected. This selects
8 # which CPUs we support in the kernel image, and the compiler instruction
13 bool "Support ARM610 processor"
21 The ARM610 is the successor to the ARM3 processor
22 and was produced by VLSI Technology Inc.
24 Say Y if you want support for the ARM610 processor.
29 bool "Support ARM710 processor" if !ARCH_CLPS7500 && ARCH_RPC
30 default y if ARCH_CLPS7500
37 A 32-bit RISC microprocessor based on the ARM7 processor core
38 designed by Advanced RISC Machines Ltd. The ARM710 is the
39 successor to the ARM610 processor. It was released in
40 July 1994 by VLSI Technology Inc.
42 Say Y if you want support for the ARM710 processor.
47 bool "Support ARM720T processor" if !ARCH_CLPS711X && !ARCH_L7200 && !ARCH_CDB89712 && ARCH_INTEGRATOR
48 default y if ARCH_CLPS711X || ARCH_L7200 || ARCH_CDB89712 || ARCH_H720X
56 A 32-bit RISC processor with 8kByte Cache, Write Buffer and
57 MMU built around an ARM7TDMI core.
59 Say Y if you want support for the ARM720T processor.
64 bool "Support ARM920T processor" if !ARCH_S3C2410
65 depends on ARCH_EP93XX || ARCH_INTEGRATOR || ARCH_S3C2410 || ARCH_IMX || ARCH_AAEC2000 || ARCH_AT91RM9200
66 default y if ARCH_S3C2410 || ARCH_AT91RM9200
74 The ARM920T is licensed to be produced by numerous vendors,
75 and is used in the Maverick EP9312 and the Samsung S3C2410.
77 More information on the Maverick EP9312 at
78 <http://linuxdevices.com/products/PD2382866068.html>.
80 Say Y if you want support for the ARM920T processor.
85 bool "Support ARM922T processor" if ARCH_INTEGRATOR
86 depends on ARCH_LH7A40X || ARCH_INTEGRATOR
87 default y if ARCH_LH7A40X
95 The ARM922T is a version of the ARM920T, but with smaller
96 instruction and data caches. It is used in Altera's
97 Excalibur XA device family.
99 Say Y if you want support for the ARM922T processor.
104 bool "Support ARM925T processor" if ARCH_OMAP1
105 depends on ARCH_OMAP15XX
106 default y if ARCH_OMAP15XX
109 select CPU_CACHE_V4WT
110 select CPU_CACHE_VIVT
114 The ARM925T is a mix between the ARM920T and ARM926T, but with
115 different instruction and data caches. It is used in TI's OMAP
118 Say Y if you want support for the ARM925T processor.
123 bool "Support ARM926T processor"
124 depends on ARCH_INTEGRATOR || ARCH_VERSATILE_PB || MACH_VERSATILE_AB || ARCH_OMAP730 || ARCH_OMAP16XX || MACH_REALVIEW_EB
125 default y if ARCH_VERSATILE_PB || MACH_VERSATILE_AB || ARCH_OMAP730 || ARCH_OMAP16XX
127 select CPU_ABRT_EV5TJ
128 select CPU_CACHE_VIVT
132 This is a variant of the ARM920. It has slightly different
133 instruction sequences for cache and TLB operations. Curiously,
134 there is no documentation on it at the ARM corporate website.
136 Say Y if you want support for the ARM926T processor.
139 # ARM1020 - needs validating
141 bool "Support ARM1020T (rev 0) processor"
142 depends on ARCH_INTEGRATOR
145 select CPU_CACHE_V4WT
146 select CPU_CACHE_VIVT
150 The ARM1020 is the 32K cached version of the ARM10 processor,
151 with an addition of a floating-point unit.
153 Say Y if you want support for the ARM1020 processor.
156 # ARM1020E - needs validating
158 bool "Support ARM1020E processor"
159 depends on ARCH_INTEGRATOR
162 select CPU_CACHE_V4WT
163 select CPU_CACHE_VIVT
170 bool "Support ARM1022E processor"
171 depends on ARCH_INTEGRATOR
174 select CPU_CACHE_VIVT
175 select CPU_COPY_V4WB # can probably do better
178 The ARM1022E is an implementation of the ARMv5TE architecture
179 based upon the ARM10 integer core with a 16KiB L1 Harvard cache,
180 embedded trace macrocell, and a floating-point unit.
182 Say Y if you want support for the ARM1022E processor.
187 bool "Support ARM1026EJ-S processor"
188 depends on ARCH_INTEGRATOR
190 select CPU_ABRT_EV5T # But need Jazelle, but EV5TJ ignores bit 10
191 select CPU_CACHE_VIVT
192 select CPU_COPY_V4WB # can probably do better
195 The ARM1026EJ-S is an implementation of the ARMv5TEJ architecture
196 based upon the ARM10 integer core.
198 Say Y if you want support for the ARM1026EJ-S processor.
203 bool "Support StrongARM(R) SA-110 processor" if !ARCH_EBSA110 && !FOOTBRIDGE && !ARCH_TBOX && !ARCH_SHARK && !ARCH_NEXUSPCI && ARCH_RPC
204 default y if ARCH_EBSA110 || FOOTBRIDGE || ARCH_TBOX || ARCH_SHARK || ARCH_NEXUSPCI
205 select CPU_32v3 if ARCH_RPC
206 select CPU_32v4 if !ARCH_RPC
208 select CPU_CACHE_V4WB
209 select CPU_CACHE_VIVT
213 The Intel StrongARM(R) SA-110 is a 32-bit microprocessor and
214 is available at five speeds ranging from 100 MHz to 233 MHz.
215 More information is available at
216 <http://developer.intel.com/design/strong/sa110.htm>.
218 Say Y if you want support for the SA-110 processor.
224 depends on ARCH_SA1100
228 select CPU_CACHE_V4WB
229 select CPU_CACHE_VIVT
235 depends on ARCH_IOP3XX || ARCH_PXA || ARCH_IXP4XX || ARCH_IXP2000
239 select CPU_CACHE_VIVT
244 bool "Support ARM V6 processor"
245 depends on ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_OMAP2
249 select CPU_CACHE_VIPT
255 bool "Support ARM V6K processor extensions" if !SMP
259 Say Y here if your ARMv6 processor supports the 'K' extension.
260 This enables the kernel to use some instructions not present
261 on previous processors, and as such a kernel build with this
262 enabled will not boot on processors with do not support these
265 # Figure out what processor architecture version we should be using.
266 # This defines the compiler instruction set which depends on the machine type.
269 select TLS_REG_EMUL if SMP
270 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
274 select TLS_REG_EMUL if SMP
275 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
279 select TLS_REG_EMUL if SMP
280 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
298 config CPU_ABRT_EV5TJ
311 config CPU_CACHE_V4WT
314 config CPU_CACHE_V4WB
320 config CPU_CACHE_VIVT
323 config CPU_CACHE_VIPT
326 # The copy-page model
339 # This selects the TLB model
343 ARM Architecture Version 3 TLB.
348 ARM Architecture Version 4 TLB with writethrough cache.
353 ARM Architecture Version 4 TLB with writeback cache.
358 ARM Architecture Version 4 TLB with writeback cache and invalidate
359 instruction cache entry.
364 comment "Processor Features"
367 bool "Support Thumb user binaries"
368 depends on CPU_ARM720T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_V6
371 Say Y if you want to include kernel support for running user space
374 The Thumb instruction set is a compressed form of the standard ARM
375 instruction set resulting in smaller binaries at the expense of
376 slightly less efficient code.
378 If you don't know what this all is, saying Y is a safe choice.
380 config CPU_BIG_ENDIAN
381 bool "Build big-endian kernel"
382 depends on ARCH_SUPPORTS_BIG_ENDIAN
384 Say Y if you plan on running a kernel in big-endian mode.
385 Note that your board must be properly built and your board
386 port must properly enable any big-endian related features
387 of your chipset/board/processor.
389 config CPU_ICACHE_DISABLE
390 bool "Disable I-Cache"
391 depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
393 Say Y here to disable the processor instruction cache. Unless
394 you have a reason not to or are unsure, say N.
396 config CPU_DCACHE_DISABLE
397 bool "Disable D-Cache"
398 depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
400 Say Y here to disable the processor data cache. Unless
401 you have a reason not to or are unsure, say N.
403 config CPU_DCACHE_WRITETHROUGH
404 bool "Force write through D-cache"
405 depends on (CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
406 default y if CPU_ARM925T
408 Say Y here to use the data cache in writethrough mode. Unless you
409 specifically require this or are unsure, say N.
411 config CPU_CACHE_ROUND_ROBIN
412 bool "Round robin I and D cache replacement algorithm"
413 depends on (CPU_ARM926T || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE)
415 Say Y here to use the predictable round-robin cache replacement
416 policy. Unless you specifically require this or are unsure, say N.
418 config CPU_BPREDICT_DISABLE
419 bool "Disable branch prediction"
420 depends on CPU_ARM1020 || CPU_V6
422 Say Y here to disable branch prediction. If unsure, say N.
427 An SMP system using a pre-ARMv6 processor (there are apparently
428 a few prototypes like that in existence) and therefore access to
429 that required register must be emulated.
433 depends on !TLS_REG_EMUL
434 default y if SMP || CPU_32v7
436 This selects support for the CP15 thread register.
437 It is defined to be available on some ARMv6 processors (including
438 all SMP capable ARMv6's) or later processors. User space may
439 assume directly accessing that register and always obtain the
440 expected value only on ARMv7 and above.
442 config NEEDS_SYSCALL_FOR_CMPXCHG
445 SMP on a pre-ARMv6 processor? Well OK then.
446 Forget about fast user space cmpxchg support.
447 It is just not possible.