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
43 select WANT_DEVICE_TREE
48 select WANT_DEVICE_TREE
56 bool "Optimize for POWER4"
60 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
61 The resulting binary will not work on POWER3 or RS64 processors
62 when compiled with binutils 2.15 or later.
67 default y if !POWER4_ONLY
76 # this is temp to handle compat with arch=ppc
80 # this is temp to handle compat with arch=ppc
84 # this is temp to handle compat with arch=ppc
102 depends on E200 || E500 || 44x
107 depends on E200 || E500
112 depends on 44x || E500
114 default y if E500 && PHYS_64BIT
117 bool 'Large physical address support' if E500
118 depends on 44x || E500
119 select RESOURCES_64BIT
122 This option enables kernel support for larger than 32-bit physical
123 addresses. This features is not be available on all e500 cores.
125 If in doubt, say N here.
128 bool "AltiVec Support"
129 depends on CLASSIC32 || POWER4
131 This option enables kernel support for the Altivec extensions to the
132 PowerPC processor. The kernel currently supports saving and restoring
133 altivec registers, and turning on the 'altivec enable' bit so user
134 processes can execute altivec instructions.
136 This option is only usefully if you have a processor that supports
137 altivec (G4, otherwise known as 74xx series), but does not have
138 any affect on a non-altivec cpu (it does, however add code to the
141 If in doubt, say Y here.
145 depends on E200 || E500
148 This option enables kernel support for the Signal Processing
149 Extensions (SPE) to the PowerPC processor. The kernel currently
150 supports saving and restoring SPE registers, and turning on the
151 'spe enable' bit so user processes can execute SPE instructions.
153 This option is only useful if you have a processor that supports
154 SPE (e500, otherwise known as 85xx series), but does not have any
155 effect on a non-spe cpu (it does, however add code to the kernel).
157 If in doubt, say Y here.
161 depends on 6xx || POWER3 || POWER4 || PPC64
164 config PPC_STD_MMU_32
166 depends on PPC_STD_MMU && PPC32
170 default y if HUGETLB_PAGE
173 config VIRT_CPU_ACCOUNTING
174 bool "Deterministic task and CPU time accounting"
178 Select this option to enable more accurate task and CPU time
179 accounting. This is done by reading a CPU counter on each
180 kernel entry and exit and on transitions within the kernel
181 between system, softirq and hardirq state, so there is a
182 small performance impact. This also enables accounting of
183 stolen time on logically-partitioned systems running on
184 IBM POWER5-based machines.
186 If in doubt, say Y here.
189 depends on PPC_STD_MMU
190 bool "Symmetric multi-processing support"
192 This enables support for systems with more than one CPU. If you have
193 a system with only one CPU, say N. If you have a system with more
194 than one CPU, say Y. Note that the kernel does not currently
195 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
196 since they have inadequate hardware support for multiprocessor
199 If you say N here, the kernel will run on single and multiprocessor
200 machines, but will use only one CPU of a multiprocessor machine. If
201 you say Y here, the kernel will run on single-processor machines.
202 On a single-processor machine, the kernel will run faster if you say
205 If you don't know what to do here, say N.
208 int "Maximum number of CPUs (2-128)"
211 default "32" if PPC64
214 config NOT_COHERENT_CACHE
216 depends on 4xx || 8xx || E200
219 config CHECK_CACHE_COHERENCY