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
44 select WANT_DEVICE_TREE
49 select WANT_DEVICE_TREE
57 bool "Optimize for POWER4"
61 Cause the compiler to optimize for POWER4/POWER5/PPC970 processors.
62 The resulting binary will not work on POWER3 or RS64 processors
63 when compiled with binutils 2.15 or later.
68 default y if !POWER4_ONLY
75 bool "Optimize for Cell Broadband Engine"
78 Cause the compiler to optimize for the PPE of the Cell Broadband
79 Engine. This will make the code run considerably faster on Cell
80 but somewhat slower on other machines. This option only changes
81 the scheduling of instructions, not the selection of instructions
82 itself, so the resulting kernel will keep running on all other
83 machines. When building a kernel that is supposed to run only
84 on Cell, you should also select the POWER4_ONLY option.
89 # this is temp to handle compat with arch=ppc
93 # this is temp to handle compat with arch=ppc
97 # this is temp to handle compat with arch=ppc
110 depends on 40x || 44x
115 depends on E200 || E500 || 44x
120 depends on E200 || E500
125 depends on 44x || E500
127 default y if E500 && PHYS_64BIT
130 bool 'Large physical address support' if E500
131 depends on 44x || E500
132 select RESOURCES_64BIT
135 This option enables kernel support for larger than 32-bit physical
136 addresses. This features is not be available on all e500 cores.
138 If in doubt, say N here.
141 bool "AltiVec Support"
142 depends on CLASSIC32 || POWER4
144 This option enables kernel support for the Altivec extensions to the
145 PowerPC processor. The kernel currently supports saving and restoring
146 altivec registers, and turning on the 'altivec enable' bit so user
147 processes can execute altivec instructions.
149 This option is only usefully if you have a processor that supports
150 altivec (G4, otherwise known as 74xx series), but does not have
151 any affect on a non-altivec cpu (it does, however add code to the
154 If in doubt, say Y here.
158 depends on E200 || E500
161 This option enables kernel support for the Signal Processing
162 Extensions (SPE) to the PowerPC processor. The kernel currently
163 supports saving and restoring SPE registers, and turning on the
164 'spe enable' bit so user processes can execute SPE instructions.
166 This option is only useful if you have a processor that supports
167 SPE (e500, otherwise known as 85xx series), but does not have any
168 effect on a non-spe cpu (it does, however add code to the kernel).
170 If in doubt, say Y here.
174 depends on 6xx || POWER3 || POWER4 || PPC64
177 config PPC_STD_MMU_32
179 depends on PPC_STD_MMU && PPC32
183 default y if HUGETLB_PAGE
186 config VIRT_CPU_ACCOUNTING
187 bool "Deterministic task and CPU time accounting"
191 Select this option to enable more accurate task and CPU time
192 accounting. This is done by reading a CPU counter on each
193 kernel entry and exit and on transitions within the kernel
194 between system, softirq and hardirq state, so there is a
195 small performance impact. This also enables accounting of
196 stolen time on logically-partitioned systems running on
197 IBM POWER5-based machines.
199 If in doubt, say Y here.
202 depends on PPC_STD_MMU
203 bool "Symmetric multi-processing support"
205 This enables support for systems with more than one CPU. If you have
206 a system with only one CPU, say N. If you have a system with more
207 than one CPU, say Y. Note that the kernel does not currently
208 support SMP machines with 603/603e/603ev or PPC750 ("G3") processors
209 since they have inadequate hardware support for multiprocessor
212 If you say N here, the kernel will run on single and multiprocessor
213 machines, but will use only one CPU of a multiprocessor machine. If
214 you say Y here, the kernel will run on single-processor machines.
215 On a single-processor machine, the kernel will run faster if you say
218 If you don't know what to do here, say N.
221 int "Maximum number of CPUs (2-128)"
224 default "32" if PPC64
227 config NOT_COHERENT_CACHE
229 depends on 4xx || 8xx || E200
232 config CHECK_CACHE_COHERENCY