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
39 select WANT_DEVICE_TREE
45 select WANT_DEVICE_TREE
50 select WANT_DEVICE_TREE
59 bool "Optimize for POWER4"
63 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
64 The resulting binary will not work on POWER3 or RS64 processors
65 when compiled with binutils 2.15 or later.
70 default y if !POWER4_ONLY
77 bool "Optimize for Cell Broadband Engine"
80 Cause the compiler to optimize for the PPE of the Cell Broadband
81 Engine. This will make the code run considerably faster on Cell
82 but somewhat slower on other machines. This option only changes
83 the scheduling of instructions, not the selection of instructions
84 itself, so the resulting kernel will keep running on all other
85 machines. When building a kernel that is supposed to run only
86 on Cell, you should also select the POWER4_ONLY option.
91 # this is temp to handle compat with arch=ppc
95 # this is temp to handle compat with arch=ppc
99 # this is temp to handle compat with arch=ppc
112 depends on 40x || 44x
117 depends on E200 || E500 || 44x
122 depends on E200 || E500
127 depends on 44x || E500
129 default y if E500 && PHYS_64BIT
132 bool 'Large physical address support' if E500
133 depends on 44x || E500
134 select RESOURCES_64BIT
137 This option enables kernel support for larger than 32-bit physical
138 addresses. This features is not be available on all e500 cores.
140 If in doubt, say N here.
143 bool "AltiVec Support"
144 depends on CLASSIC32 || POWER4
146 This option enables kernel support for the Altivec extensions to the
147 PowerPC processor. The kernel currently supports saving and restoring
148 altivec registers, and turning on the 'altivec enable' bit so user
149 processes can execute altivec instructions.
151 This option is only usefully if you have a processor that supports
152 altivec (G4, otherwise known as 74xx series), but does not have
153 any affect on a non-altivec cpu (it does, however add code to the
156 If in doubt, say Y here.
160 depends on E200 || E500
163 This option enables kernel support for the Signal Processing
164 Extensions (SPE) to the PowerPC processor. The kernel currently
165 supports saving and restoring SPE registers, and turning on the
166 'spe enable' bit so user processes can execute SPE instructions.
168 This option is only useful if you have a processor that supports
169 SPE (e500, otherwise known as 85xx series), but does not have any
170 effect on a non-spe cpu (it does, however add code to the kernel).
172 If in doubt, say Y here.
176 depends on 6xx || POWER3 || POWER4 || PPC64
179 config PPC_STD_MMU_32
181 depends on PPC_STD_MMU && PPC32
185 default y if HUGETLB_PAGE
188 config VIRT_CPU_ACCOUNTING
189 bool "Deterministic task and CPU time accounting"
193 Select this option to enable more accurate task and CPU time
194 accounting. This is done by reading a CPU counter on each
195 kernel entry and exit and on transitions within the kernel
196 between system, softirq and hardirq state, so there is a
197 small performance impact. This also enables accounting of
198 stolen time on logically-partitioned systems running on
199 IBM POWER5-based machines.
201 If in doubt, say Y here.
204 depends on PPC_STD_MMU
205 bool "Symmetric multi-processing support"
207 This enables support for systems with more than one CPU. If you have
208 a system with only one CPU, say N. If you have a system with more
209 than one CPU, say Y. Note that the kernel does not currently
210 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
211 since they have inadequate hardware support for multiprocessor
214 If you say N here, the kernel will run on single and multiprocessor
215 machines, but will use only one CPU of a multiprocessor machine. If
216 you say Y here, the kernel will run on single-processor machines.
217 On a single-processor machine, the kernel will run faster if you say
220 If you don't know what to do here, say N.
223 int "Maximum number of CPUs (2-128)"
226 default "32" if PPC64
229 config NOT_COHERENT_CACHE
231 depends on 4xx || 8xx || E200
234 config CHECK_CACHE_COHERENCY