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"
32 select WANT_DEVICE_TREE
39 select WANT_DEVICE_TREE
45 select WANT_DEVICE_TREE
51 select WANT_DEVICE_TREE
60 bool "Optimize for POWER4"
64 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
65 The resulting binary will not work on POWER3 or RS64 processors
66 when compiled with binutils 2.15 or later.
71 default y if !POWER4_ONLY
78 bool "Optimize for Cell Broadband Engine"
81 Cause the compiler to optimize for the PPE of the Cell Broadband
82 Engine. This will make the code run considerably faster on Cell
83 but somewhat slower on other machines. This option only changes
84 the scheduling of instructions, not the selection of instructions
85 itself, so the resulting kernel will keep running on all other
86 machines. When building a kernel that is supposed to run only
87 on Cell, you should also select the POWER4_ONLY option.
92 # this is temp to handle compat with arch=ppc
97 select FSL_EMB_PERFMON
106 depends on 40x || 44x
111 depends on E200 || E500 || 44x
116 depends on E200 || E500
119 config FSL_EMB_PERFMON
124 depends on 44x || E500
126 default y if E500 && PHYS_64BIT
129 bool 'Large physical address support' if E500
130 depends on 44x || E500
131 select RESOURCES_64BIT
134 This option enables kernel support for larger than 32-bit physical
135 addresses. This features is not be available on all e500 cores.
137 If in doubt, say N here.
140 bool "AltiVec Support"
141 depends on CLASSIC32 || POWER4
143 This option enables kernel support for the Altivec extensions to the
144 PowerPC processor. The kernel currently supports saving and restoring
145 altivec registers, and turning on the 'altivec enable' bit so user
146 processes can execute altivec instructions.
148 This option is only usefully if you have a processor that supports
149 altivec (G4, otherwise known as 74xx series), but does not have
150 any affect on a non-altivec cpu (it does, however add code to the
153 If in doubt, say Y here.
157 depends on E200 || E500
160 This option enables kernel support for the Signal Processing
161 Extensions (SPE) to the PowerPC processor. The kernel currently
162 supports saving and restoring SPE registers, and turning on the
163 'spe enable' bit so user processes can execute SPE instructions.
165 This option is only useful if you have a processor that supports
166 SPE (e500, otherwise known as 85xx series), but does not have any
167 effect on a non-spe cpu (it does, however add code to the kernel).
169 If in doubt, say Y here.
173 depends on 6xx || POWER3 || POWER4 || PPC64
176 config PPC_STD_MMU_32
178 depends on PPC_STD_MMU && PPC32
182 default y if HUGETLB_PAGE
185 config VIRT_CPU_ACCOUNTING
186 bool "Deterministic task and CPU time accounting"
190 Select this option to enable more accurate task and CPU time
191 accounting. This is done by reading a CPU counter on each
192 kernel entry and exit and on transitions within the kernel
193 between system, softirq and hardirq state, so there is a
194 small performance impact. This also enables accounting of
195 stolen time on logically-partitioned systems running on
196 IBM POWER5-based machines.
198 If in doubt, say Y here.
201 depends on PPC_STD_MMU
202 bool "Symmetric multi-processing support"
204 This enables support for systems with more than one CPU. If you have
205 a system with only one CPU, say N. If you have a system with more
206 than one CPU, say Y. Note that the kernel does not currently
207 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
208 since they have inadequate hardware support for multiprocessor
211 If you say N here, the kernel will run on single and multiprocessor
212 machines, but will use only one CPU of a multiprocessor machine. If
213 you say Y here, the kernel will run on single-processor machines.
214 On a single-processor machine, the kernel will run faster if you say
217 If you don't know what to do here, say N.
220 int "Maximum number of CPUs (2-128)"
223 default "32" if PPC64
226 config NOT_COHERENT_CACHE
228 depends on 4xx || 8xx || E200
231 config CHECK_CACHE_COHERENCY