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 512x/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 "512x/52xx/6xx/7xx/74xx/82xx/83xx/86xx"
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
74 bool "Optimize for Cell Broadband Engine"
77 Cause the compiler to optimize for the PPE of the Cell Broadband
78 Engine. This will make the code run considerably faster on Cell
79 but somewhat slower on other machines. This option only changes
80 the scheduling of instructions, not the selection of instructions
81 itself, so the resulting kernel will keep running on all other
82 machines. When building a kernel that is supposed to run only
83 on Cell, you should also select the POWER4_ONLY option.
88 # this is temp to handle compat with arch=ppc
93 select FSL_EMB_PERFMON
102 depends on 40x || 44x
107 depends on E200 || E500 || 44x
112 depends on E200 || E500
115 config FSL_EMB_PERFMON
120 depends on 44x || E500
122 default y if E500 && PHYS_64BIT
125 bool 'Large physical address support' if E500
126 depends on 44x || E500
127 select RESOURCES_64BIT
130 This option enables kernel support for larger than 32-bit physical
131 addresses. This features is not be available on all e500 cores.
133 If in doubt, say N here.
136 bool "AltiVec Support"
137 depends on CLASSIC32 || POWER4
139 This option enables kernel support for the Altivec extensions to the
140 PowerPC processor. The kernel currently supports saving and restoring
141 altivec registers, and turning on the 'altivec enable' bit so user
142 processes can execute altivec instructions.
144 This option is only usefully if you have a processor that supports
145 altivec (G4, otherwise known as 74xx series), but does not have
146 any affect on a non-altivec cpu (it does, however add code to the
149 If in doubt, say Y here.
153 depends on E200 || E500
156 This option enables kernel support for the Signal Processing
157 Extensions (SPE) to the PowerPC processor. The kernel currently
158 supports saving and restoring SPE registers, and turning on the
159 'spe enable' bit so user processes can execute SPE instructions.
161 This option is only useful if you have a processor that supports
162 SPE (e500, otherwise known as 85xx series), but does not have any
163 effect on a non-spe cpu (it does, however add code to the kernel).
165 If in doubt, say Y here.
169 depends on 6xx || POWER3 || POWER4 || PPC64
172 config PPC_STD_MMU_32
174 depends on PPC_STD_MMU && PPC32
178 default y if HUGETLB_PAGE
181 config VIRT_CPU_ACCOUNTING
182 bool "Deterministic task and CPU time accounting"
186 Select this option to enable more accurate task and CPU time
187 accounting. This is done by reading a CPU counter on each
188 kernel entry and exit and on transitions within the kernel
189 between system, softirq and hardirq state, so there is a
190 small performance impact. This also enables accounting of
191 stolen time on logically-partitioned systems running on
192 IBM POWER5-based machines.
194 If in doubt, say Y here.
197 depends on PPC_STD_MMU
198 bool "Symmetric multi-processing support"
200 This enables support for systems with more than one CPU. If you have
201 a system with only one CPU, say N. If you have a system with more
202 than one CPU, say Y. Note that the kernel does not currently
203 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
204 since they have inadequate hardware support for multiprocessor
207 If you say N here, the kernel will run on single and multiprocessor
208 machines, but will use only one CPU of a multiprocessor machine. If
209 you say Y here, the kernel will run on single-processor machines.
210 On a single-processor machine, the kernel will run faster if you say
213 If you don't know what to do here, say N.
216 int "Maximum number of CPUs (2-128)"
219 default "32" if PPC64
222 config NOT_COHERENT_CACHE
224 depends on 4xx || 8xx || E200 || PPC_MPC512x
227 config CHECK_CACHE_COHERENCY