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
242 # XScale Core Version 3
245 depends on ARCH_IXP23XX
249 select CPU_CACHE_VIVT
255 bool "Support ARM V6 processor"
256 depends on ARCH_INTEGRATOR || MACH_REALVIEW_EB || ARCH_OMAP2
260 select CPU_CACHE_VIPT
266 bool "Support ARM V6K processor extensions" if !SMP
270 Say Y here if your ARMv6 processor supports the 'K' extension.
271 This enables the kernel to use some instructions not present
272 on previous processors, and as such a kernel build with this
273 enabled will not boot on processors with do not support these
276 # Figure out what processor architecture version we should be using.
277 # This defines the compiler instruction set which depends on the machine type.
280 select TLS_REG_EMUL if SMP
281 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
285 select TLS_REG_EMUL if SMP
286 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
290 select TLS_REG_EMUL if SMP
291 select NEEDS_SYSCALL_FOR_CMPXCHG if SMP
309 config CPU_ABRT_EV5TJ
322 config CPU_CACHE_V4WT
325 config CPU_CACHE_V4WB
331 config CPU_CACHE_VIVT
334 config CPU_CACHE_VIPT
337 # The copy-page model
350 # This selects the TLB model
354 ARM Architecture Version 3 TLB.
359 ARM Architecture Version 4 TLB with writethrough cache.
364 ARM Architecture Version 4 TLB with writeback cache.
369 ARM Architecture Version 4 TLB with writeback cache and invalidate
370 instruction cache entry.
376 # CPU supports 36-bit I/O
381 comment "Processor Features"
384 bool "Support Thumb user binaries"
385 depends on CPU_ARM720T || CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_ARM1020E || CPU_ARM1022 || CPU_ARM1026 || CPU_XSCALE || CPU_XSC3 || CPU_V6
388 Say Y if you want to include kernel support for running user space
391 The Thumb instruction set is a compressed form of the standard ARM
392 instruction set resulting in smaller binaries at the expense of
393 slightly less efficient code.
395 If you don't know what this all is, saying Y is a safe choice.
397 config CPU_BIG_ENDIAN
398 bool "Build big-endian kernel"
399 depends on ARCH_SUPPORTS_BIG_ENDIAN
401 Say Y if you plan on running a kernel in big-endian mode.
402 Note that your board must be properly built and your board
403 port must properly enable any big-endian related features
404 of your chipset/board/processor.
406 config CPU_ICACHE_DISABLE
407 bool "Disable I-Cache"
408 depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
410 Say Y here to disable the processor instruction cache. Unless
411 you have a reason not to or are unsure, say N.
413 config CPU_DCACHE_DISABLE
414 bool "Disable D-Cache"
415 depends on CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6
417 Say Y here to disable the processor data cache. Unless
418 you have a reason not to or are unsure, say N.
420 config CPU_DCACHE_WRITETHROUGH
421 bool "Force write through D-cache"
422 depends on (CPU_ARM920T || CPU_ARM922T || CPU_ARM925T || CPU_ARM926T || CPU_ARM1020 || CPU_V6) && !CPU_DCACHE_DISABLE
423 default y if CPU_ARM925T
425 Say Y here to use the data cache in writethrough mode. Unless you
426 specifically require this or are unsure, say N.
428 config CPU_CACHE_ROUND_ROBIN
429 bool "Round robin I and D cache replacement algorithm"
430 depends on (CPU_ARM926T || CPU_ARM1020) && (!CPU_ICACHE_DISABLE || !CPU_DCACHE_DISABLE)
432 Say Y here to use the predictable round-robin cache replacement
433 policy. Unless you specifically require this or are unsure, say N.
435 config CPU_BPREDICT_DISABLE
436 bool "Disable branch prediction"
437 depends on CPU_ARM1020 || CPU_V6
439 Say Y here to disable branch prediction. If unsure, say N.
444 An SMP system using a pre-ARMv6 processor (there are apparently
445 a few prototypes like that in existence) and therefore access to
446 that required register must be emulated.
450 depends on !TLS_REG_EMUL
451 default y if SMP || CPU_32v7
453 This selects support for the CP15 thread register.
454 It is defined to be available on some ARMv6 processors (including
455 all SMP capable ARMv6's) or later processors. User space may
456 assume directly accessing that register and always obtain the
457 expected value only on ARMv7 and above.
459 config NEEDS_SYSCALL_FOR_CMPXCHG
462 SMP on a pre-ARMv6 processor? Well OK then.
463 Forget about fast user space cmpxchg support.
464 It is just not possible.