5 This option selects whether a 32-bit or a 64-bit kernel
8 menu "Processor support"
10 prompt "Processor Type"
14 There are five families of 32 bit PowerPC chips supported.
15 The most common ones are the desktop and server CPUs (601, 603,
16 604, 740, 750, 74xx) CPUs from Freescale and IBM, with their
17 embedded 52xx/82xx/83xx/86xx counterparts.
18 The other embeeded parts, namely 4xx, 8xx, e200 (55xx) and e500
19 (85xx) each form a family of their own that is not compatible
22 If unsure, select 52xx/6xx/7xx/74xx/82xx/83xx/86xx.
25 bool "52xx/6xx/7xx/74xx/82xx/83xx/86xx"
33 select WANT_DEVICE_TREE
47 select WANT_DEVICE_TREE
55 bool "Optimize for POWER4"
59 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
60 The resulting binary will not work on POWER3 or RS64 processors
61 when compiled with binutils 2.15 or later.
66 default y if !POWER4_ONLY
75 # this is temp to handle compat with arch=ppc
79 # this is temp to handle compat with arch=ppc
83 # this is temp to handle compat with arch=ppc
101 depends on E200 || E500 || 44x
106 depends on E200 || E500
111 depends on 44x || E500
113 default y if E500 && PHYS_64BIT
116 bool 'Large physical address support' if E500
117 depends on 44x || E500
118 select RESOURCES_64BIT
121 This option enables kernel support for larger than 32-bit physical
122 addresses. This features is not be available on all e500 cores.
124 If in doubt, say N here.
127 bool "AltiVec Support"
128 depends on CLASSIC32 || POWER4
130 This option enables kernel support for the Altivec extensions to the
131 PowerPC processor. The kernel currently supports saving and restoring
132 altivec registers, and turning on the 'altivec enable' bit so user
133 processes can execute altivec instructions.
135 This option is only usefully if you have a processor that supports
136 altivec (G4, otherwise known as 74xx series), but does not have
137 any affect on a non-altivec cpu (it does, however add code to the
140 If in doubt, say Y here.
144 depends on E200 || E500
147 This option enables kernel support for the Signal Processing
148 Extensions (SPE) to the PowerPC processor. The kernel currently
149 supports saving and restoring SPE registers, and turning on the
150 'spe enable' bit so user processes can execute SPE instructions.
152 This option is only useful if you have a processor that supports
153 SPE (e500, otherwise known as 85xx series), but does not have any
154 effect on a non-spe cpu (it does, however add code to the kernel).
156 If in doubt, say Y here.
160 depends on 6xx || POWER3 || POWER4 || PPC64
163 config PPC_STD_MMU_32
165 depends on PPC_STD_MMU && PPC32
169 default y if HUGETLB_PAGE
172 config VIRT_CPU_ACCOUNTING
173 bool "Deterministic task and CPU time accounting"
177 Select this option to enable more accurate task and CPU time
178 accounting. This is done by reading a CPU counter on each
179 kernel entry and exit and on transitions within the kernel
180 between system, softirq and hardirq state, so there is a
181 small performance impact. This also enables accounting of
182 stolen time on logically-partitioned systems running on
183 IBM POWER5-based machines.
185 If in doubt, say Y here.
188 depends on PPC_STD_MMU
189 bool "Symmetric multi-processing support"
191 This enables support for systems with more than one CPU. If you have
192 a system with only one CPU, say N. If you have a system with more
193 than one CPU, say Y. Note that the kernel does not currently
194 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
195 since they have inadequate hardware support for multiprocessor
198 If you say N here, the kernel will run on single and multiprocessor
199 machines, but will use only one CPU of a multiprocessor machine. If
200 you say Y here, the kernel will run on single-processor machines.
201 On a single-processor machine, the kernel will run faster if you say
204 If you don't know what to do here, say N.
207 int "Maximum number of CPUs (2-128)"
210 default "32" if PPC64
213 config NOT_COHERENT_CACHE
215 depends on 4xx || 8xx || E200
218 config CHECK_CACHE_COHERENCY