Kconfig 24 KB

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  1. # For a description of the syntax of this configuration file,
  2. # see Documentation/kbuild/kconfig-language.txt.
  3. #
  4. mainmenu "Linux/PowerPC Kernel Configuration"
  5. source "arch/powerpc/platforms/Kconfig.cputype"
  6. config PPC32
  7. bool
  8. default y if !PPC64
  9. config 64BIT
  10. bool
  11. default y if PPC64
  12. config WORD_SIZE
  13. int
  14. default 64 if PPC64
  15. default 32 if !PPC64
  16. config ARCH_PHYS_ADDR_T_64BIT
  17. def_bool PPC64 || PHYS_64BIT
  18. config MMU
  19. bool
  20. default y
  21. config GENERIC_CMOS_UPDATE
  22. def_bool y
  23. config GENERIC_TIME
  24. def_bool y
  25. config GENERIC_TIME_VSYSCALL
  26. def_bool y
  27. config GENERIC_CLOCKEVENTS
  28. def_bool y
  29. config GENERIC_HARDIRQS
  30. bool
  31. default y
  32. config GENERIC_HARDIRQS_NO__DO_IRQ
  33. bool
  34. default y
  35. config HAVE_SETUP_PER_CPU_AREA
  36. def_bool PPC64
  37. config NEED_PER_CPU_EMBED_FIRST_CHUNK
  38. def_bool PPC64
  39. config IRQ_PER_CPU
  40. bool
  41. default y
  42. config NR_IRQS
  43. int "Number of virtual interrupt numbers"
  44. range 32 512
  45. default "512"
  46. help
  47. This defines the number of virtual interrupt numbers the kernel
  48. can manage. Virtual interrupt numbers are what you see in
  49. /proc/interrupts. If you configure your system to have too few,
  50. drivers will fail to load or worse - handle with care.
  51. config STACKTRACE_SUPPORT
  52. bool
  53. default y
  54. config HAVE_LATENCYTOP_SUPPORT
  55. def_bool y
  56. config TRACE_IRQFLAGS_SUPPORT
  57. bool
  58. default y
  59. config LOCKDEP_SUPPORT
  60. bool
  61. default y
  62. config RWSEM_GENERIC_SPINLOCK
  63. bool
  64. config RWSEM_XCHGADD_ALGORITHM
  65. bool
  66. default y
  67. config GENERIC_LOCKBREAK
  68. bool
  69. default y
  70. depends on SMP && PREEMPT
  71. config ARCH_HAS_ILOG2_U32
  72. bool
  73. default y
  74. config ARCH_HAS_ILOG2_U64
  75. bool
  76. default y if 64BIT
  77. config GENERIC_HWEIGHT
  78. bool
  79. default y
  80. config GENERIC_FIND_NEXT_BIT
  81. bool
  82. default y
  83. config GENERIC_GPIO
  84. bool
  85. help
  86. Generic GPIO API support
  87. config ARCH_NO_VIRT_TO_BUS
  88. def_bool PPC64
  89. config PPC
  90. bool
  91. default y
  92. select HAVE_FTRACE_MCOUNT_RECORD
  93. select HAVE_DYNAMIC_FTRACE
  94. select HAVE_FUNCTION_TRACER
  95. select HAVE_FUNCTION_GRAPH_TRACER
  96. select ARCH_WANT_OPTIONAL_GPIOLIB
  97. select HAVE_IDE
  98. select HAVE_IOREMAP_PROT
  99. select HAVE_EFFICIENT_UNALIGNED_ACCESS
  100. select HAVE_KPROBES
  101. select HAVE_ARCH_KGDB
  102. select HAVE_KRETPROBES
  103. select HAVE_ARCH_TRACEHOOK
  104. select HAVE_LMB
  105. select HAVE_DMA_ATTRS
  106. select HAVE_DMA_API_DEBUG
  107. select USE_GENERIC_SMP_HELPERS if SMP
  108. select HAVE_OPROFILE
  109. select HAVE_SYSCALL_WRAPPERS if PPC64
  110. select GENERIC_ATOMIC64 if PPC32
  111. select HAVE_PERF_EVENTS
  112. config EARLY_PRINTK
  113. bool
  114. default y
  115. config COMPAT
  116. bool
  117. default y if PPC64
  118. select COMPAT_BINFMT_ELF
  119. config SYSVIPC_COMPAT
  120. bool
  121. depends on COMPAT && SYSVIPC
  122. default y
  123. # All PPC32s use generic nvram driver through ppc_md
  124. config GENERIC_NVRAM
  125. bool
  126. default y if PPC32
  127. config SCHED_OMIT_FRAME_POINTER
  128. bool
  129. default y
  130. config ARCH_MAY_HAVE_PC_FDC
  131. bool
  132. default !PPC_PSERIES || PCI
  133. config PPC_OF
  134. def_bool y
  135. config OF
  136. def_bool y
  137. config PPC_UDBG_16550
  138. bool
  139. default n
  140. config GENERIC_TBSYNC
  141. bool
  142. default y if PPC32 && SMP
  143. default n
  144. config AUDIT_ARCH
  145. bool
  146. default y
  147. config GENERIC_BUG
  148. bool
  149. default y
  150. depends on BUG
  151. config SYS_SUPPORTS_APM_EMULATION
  152. default y if PMAC_APM_EMU
  153. bool
  154. config DTC
  155. bool
  156. default y
  157. config DEFAULT_UIMAGE
  158. bool
  159. help
  160. Used to allow a board to specify it wants a uImage built by default
  161. default n
  162. config REDBOOT
  163. bool
  164. config ARCH_HIBERNATION_POSSIBLE
  165. bool
  166. default y
  167. config ARCH_SUSPEND_POSSIBLE
  168. def_bool y
  169. depends on ADB_PMU || PPC_EFIKA || PPC_LITE5200 || PPC_83xx
  170. config PPC_DCR_NATIVE
  171. bool
  172. default n
  173. config PPC_DCR_MMIO
  174. bool
  175. default n
  176. config PPC_DCR
  177. bool
  178. depends on PPC_DCR_NATIVE || PPC_DCR_MMIO
  179. default y
  180. config PPC_OF_PLATFORM_PCI
  181. bool
  182. depends on PCI
  183. depends on PPC64 # not supported on 32 bits yet
  184. default n
  185. config ARCH_SUPPORTS_DEBUG_PAGEALLOC
  186. def_bool y
  187. source "init/Kconfig"
  188. source "kernel/Kconfig.freezer"
  189. source "arch/powerpc/sysdev/Kconfig"
  190. source "arch/powerpc/platforms/Kconfig"
  191. menu "Kernel options"
  192. config HIGHMEM
  193. bool "High memory support"
  194. depends on PPC32
  195. source kernel/time/Kconfig
  196. source kernel/Kconfig.hz
  197. source kernel/Kconfig.preempt
  198. source "fs/Kconfig.binfmt"
  199. config HUGETLB_PAGE_SIZE_VARIABLE
  200. bool
  201. depends on HUGETLB_PAGE
  202. default y
  203. config MATH_EMULATION
  204. bool "Math emulation"
  205. depends on 4xx || 8xx || E200 || PPC_MPC832x || E500
  206. ---help---
  207. Some PowerPC chips designed for embedded applications do not have
  208. a floating-point unit and therefore do not implement the
  209. floating-point instructions in the PowerPC instruction set. If you
  210. say Y here, the kernel will include code to emulate a floating-point
  211. unit, which will allow programs that use floating-point
  212. instructions to run.
  213. config 8XX_MINIMAL_FPEMU
  214. bool "Minimal math emulation for 8xx"
  215. depends on 8xx && !MATH_EMULATION
  216. help
  217. Older arch/ppc kernels still emulated a few floating point
  218. instructions such as load and store, even when full math
  219. emulation is disabled. Say "Y" here if you want to preserve
  220. this behavior.
  221. It is recommended that you build a soft-float userspace instead.
  222. config IOMMU_VMERGE
  223. bool "Enable IOMMU virtual merging"
  224. depends on PPC64
  225. default y
  226. help
  227. Cause IO segments sent to a device for DMA to be merged virtually
  228. by the IOMMU when they happen to have been allocated contiguously.
  229. This doesn't add pressure to the IOMMU allocator. However, some
  230. drivers don't support getting large merged segments coming back
  231. from *_map_sg().
  232. Most drivers don't have this problem; it is safe to say Y here.
  233. config IOMMU_HELPER
  234. def_bool PPC64
  235. config SWIOTLB
  236. bool "SWIOTLB support"
  237. default n
  238. select IOMMU_HELPER
  239. ---help---
  240. Support for IO bounce buffering for systems without an IOMMU.
  241. This allows us to DMA to the full physical address space on
  242. platforms where the size of a physical address is larger
  243. than the bus address. Not all platforms support this.
  244. config HOTPLUG_CPU
  245. bool "Support for enabling/disabling CPUs"
  246. depends on SMP && HOTPLUG && EXPERIMENTAL && (PPC_PSERIES || PPC_PMAC)
  247. ---help---
  248. Say Y here to be able to disable and re-enable individual
  249. CPUs at runtime on SMP machines.
  250. Say N if you are unsure.
  251. config ARCH_ENABLE_MEMORY_HOTPLUG
  252. def_bool y
  253. config ARCH_HAS_WALK_MEMORY
  254. def_bool y
  255. config ARCH_ENABLE_MEMORY_HOTREMOVE
  256. def_bool y
  257. config KEXEC
  258. bool "kexec system call (EXPERIMENTAL)"
  259. depends on PPC_BOOK3S && EXPERIMENTAL
  260. help
  261. kexec is a system call that implements the ability to shutdown your
  262. current kernel, and to start another kernel. It is like a reboot
  263. but it is independent of the system firmware. And like a reboot
  264. you can start any kernel with it, not just Linux.
  265. The name comes from the similarity to the exec system call.
  266. It is an ongoing process to be certain the hardware in a machine
  267. is properly shutdown, so do not be surprised if this code does not
  268. initially work for you. It may help to enable device hotplugging
  269. support. As of this writing the exact hardware interface is
  270. strongly in flux, so no good recommendation can be made.
  271. config CRASH_DUMP
  272. bool "Build a kdump crash kernel"
  273. depends on PPC64 || 6xx
  274. select RELOCATABLE if PPC64
  275. help
  276. Build a kernel suitable for use as a kdump capture kernel.
  277. The same kernel binary can be used as production kernel and dump
  278. capture kernel.
  279. config PHYP_DUMP
  280. bool "Hypervisor-assisted dump (EXPERIMENTAL)"
  281. depends on PPC_PSERIES && EXPERIMENTAL
  282. help
  283. Hypervisor-assisted dump is meant to be a kdump replacement
  284. offering robustness and speed not possible without system
  285. hypervisor assistance.
  286. If unsure, say "N"
  287. config PPCBUG_NVRAM
  288. bool "Enable reading PPCBUG NVRAM during boot" if PPLUS || LOPEC
  289. default y if PPC_PREP
  290. config IRQ_ALL_CPUS
  291. bool "Distribute interrupts on all CPUs by default"
  292. depends on SMP && !MV64360
  293. help
  294. This option gives the kernel permission to distribute IRQs across
  295. multiple CPUs. Saying N here will route all IRQs to the first
  296. CPU. Generally saying Y is safe, although some problems have been
  297. reported with SMP Power Macintoshes with this option enabled.
  298. config SPARSE_IRQ
  299. bool "Support sparse irq numbering"
  300. default y
  301. help
  302. This enables support for sparse irqs. This is useful for distro
  303. kernels that want to define a high CONFIG_NR_CPUS value but still
  304. want to have low kernel memory footprint on smaller machines.
  305. ( Sparse IRQs can also be beneficial on NUMA boxes, as they spread
  306. out the irq_desc[] array in a more NUMA-friendly way. )
  307. If you don't know what to do here, say Y.
  308. config NUMA
  309. bool "NUMA support"
  310. depends on PPC64
  311. default y if SMP && PPC_PSERIES
  312. config NODES_SHIFT
  313. int
  314. default "8" if PPC64
  315. default "4"
  316. depends on NEED_MULTIPLE_NODES
  317. config MAX_ACTIVE_REGIONS
  318. int
  319. default "256" if PPC64
  320. default "32"
  321. config ARCH_SELECT_MEMORY_MODEL
  322. def_bool y
  323. depends on PPC64
  324. config ARCH_FLATMEM_ENABLE
  325. def_bool y
  326. depends on (PPC64 && !NUMA) || PPC32
  327. config ARCH_SPARSEMEM_ENABLE
  328. def_bool y
  329. depends on PPC64
  330. select SPARSEMEM_VMEMMAP_ENABLE
  331. config ARCH_SPARSEMEM_DEFAULT
  332. def_bool y
  333. depends on (SMP && PPC_PSERIES) || PPC_PS3
  334. config ARCH_POPULATES_NODE_MAP
  335. def_bool y
  336. config SYS_SUPPORTS_HUGETLBFS
  337. def_bool y
  338. depends on PPC_BOOK3S_64
  339. source "mm/Kconfig"
  340. config ARCH_MEMORY_PROBE
  341. def_bool y
  342. depends on MEMORY_HOTPLUG
  343. # Some NUMA nodes have memory ranges that span
  344. # other nodes. Even though a pfn is valid and
  345. # between a node's start and end pfns, it may not
  346. # reside on that node. See memmap_init_zone()
  347. # for details.
  348. config NODES_SPAN_OTHER_NODES
  349. def_bool y
  350. depends on NEED_MULTIPLE_NODES
  351. config PPC_HAS_HASH_64K
  352. bool
  353. depends on PPC64
  354. default n
  355. config STDBINUTILS
  356. bool "Using standard binutils settings"
  357. depends on 44x
  358. default y
  359. help
  360. Turning this option off allows you to select 256KB PAGE_SIZE on 44x.
  361. Note, that kernel will be able to run only those applications,
  362. which had been compiled using binutils later than 2.17.50.0.3 with
  363. '-zmax-page-size' set to 256K (the default is 64K). Or, if using
  364. the older binutils, you can patch them with a trivial patch, which
  365. changes the ELF_MAXPAGESIZE definition from 0x10000 to 0x40000.
  366. choice
  367. prompt "Page size"
  368. default PPC_4K_PAGES
  369. help
  370. Select the kernel logical page size. Increasing the page size
  371. will reduce software overhead at each page boundary, allow
  372. hardware prefetch mechanisms to be more effective, and allow
  373. larger dma transfers increasing IO efficiency and reducing
  374. overhead. However the utilization of memory will increase.
  375. For example, each cached file will using a multiple of the
  376. page size to hold its contents and the difference between the
  377. end of file and the end of page is wasted.
  378. Some dedicated systems, such as software raid serving with
  379. accelerated calculations, have shown significant increases.
  380. If you configure a 64 bit kernel for 64k pages but the
  381. processor does not support them, then the kernel will simulate
  382. them with 4k pages, loading them on demand, but with the
  383. reduced software overhead and larger internal fragmentation.
  384. For the 32 bit kernel, a large page option will not be offered
  385. unless it is supported by the configured processor.
  386. If unsure, choose 4K_PAGES.
  387. config PPC_4K_PAGES
  388. bool "4k page size"
  389. config PPC_16K_PAGES
  390. bool "16k page size" if 44x
  391. config PPC_64K_PAGES
  392. bool "64k page size" if 44x || PPC_STD_MMU_64 || PPC_BOOK3E_64
  393. select PPC_HAS_HASH_64K if PPC_STD_MMU_64
  394. config PPC_256K_PAGES
  395. bool "256k page size" if 44x
  396. depends on !STDBINUTILS
  397. help
  398. Make the page size 256k.
  399. As the ELF standard only requires alignment to support page
  400. sizes up to 64k, you will need to compile all of your user
  401. space applications with a non-standard binutils settings
  402. (see the STDBINUTILS description for details).
  403. Say N unless you know what you are doing.
  404. endchoice
  405. config FORCE_MAX_ZONEORDER
  406. int "Maximum zone order"
  407. range 9 64 if PPC64 && PPC_64K_PAGES
  408. default "9" if PPC64 && PPC_64K_PAGES
  409. range 13 64 if PPC64 && !PPC_64K_PAGES
  410. default "13" if PPC64 && !PPC_64K_PAGES
  411. range 9 64 if PPC32 && PPC_16K_PAGES
  412. default "9" if PPC32 && PPC_16K_PAGES
  413. range 7 64 if PPC32 && PPC_64K_PAGES
  414. default "7" if PPC32 && PPC_64K_PAGES
  415. range 5 64 if PPC32 && PPC_256K_PAGES
  416. default "5" if PPC32 && PPC_256K_PAGES
  417. range 11 64
  418. default "11"
  419. help
  420. The kernel memory allocator divides physically contiguous memory
  421. blocks into "zones", where each zone is a power of two number of
  422. pages. This option selects the largest power of two that the kernel
  423. keeps in the memory allocator. If you need to allocate very large
  424. blocks of physically contiguous memory, then you may need to
  425. increase this value.
  426. This config option is actually maximum order plus one. For example,
  427. a value of 11 means that the largest free memory block is 2^10 pages.
  428. The page size is not necessarily 4KB. For example, on 64-bit
  429. systems, 64KB pages can be enabled via CONFIG_PPC_64K_PAGES. Keep
  430. this in mind when choosing a value for this option.
  431. config PPC_SUBPAGE_PROT
  432. bool "Support setting protections for 4k subpages"
  433. depends on PPC_STD_MMU_64 && PPC_64K_PAGES
  434. help
  435. This option adds support for a system call to allow user programs
  436. to set access permissions (read/write, readonly, or no access)
  437. on the 4k subpages of each 64k page.
  438. config SCHED_SMT
  439. bool "SMT (Hyperthreading) scheduler support"
  440. depends on PPC64 && SMP
  441. help
  442. SMT scheduler support improves the CPU scheduler's decision making
  443. when dealing with POWER5 cpus at a cost of slightly increased
  444. overhead in some places. If unsure say N here.
  445. config PROC_DEVICETREE
  446. bool "Support for device tree in /proc"
  447. depends on PROC_FS
  448. help
  449. This option adds a device-tree directory under /proc which contains
  450. an image of the device tree that the kernel copies from Open
  451. Firmware or other boot firmware. If unsure, say Y here.
  452. config CMDLINE_BOOL
  453. bool "Default bootloader kernel arguments"
  454. config CMDLINE
  455. string "Initial kernel command string"
  456. depends on CMDLINE_BOOL
  457. default "console=ttyS0,9600 console=tty0 root=/dev/sda2"
  458. help
  459. On some platforms, there is currently no way for the boot loader to
  460. pass arguments to the kernel. For these platforms, you can supply
  461. some command-line options at build time by entering them here. In
  462. most cases you will need to specify the root device here.
  463. config EXTRA_TARGETS
  464. string "Additional default image types"
  465. help
  466. List additional targets to be built by the bootwrapper here (separated
  467. by spaces). This is useful for targets that depend of device tree
  468. files in the .dts directory.
  469. Targets in this list will be build as part of the default build
  470. target, or when the user does a 'make zImage' or a
  471. 'make zImage.initrd'.
  472. If unsure, leave blank
  473. if !44x || BROKEN
  474. config ARCH_WANTS_FREEZER_CONTROL
  475. def_bool y
  476. depends on ADB_PMU
  477. source kernel/power/Kconfig
  478. endif
  479. config SECCOMP
  480. bool "Enable seccomp to safely compute untrusted bytecode"
  481. depends on PROC_FS
  482. default y
  483. help
  484. This kernel feature is useful for number crunching applications
  485. that may need to compute untrusted bytecode during their
  486. execution. By using pipes or other transports made available to
  487. the process as file descriptors supporting the read/write
  488. syscalls, it's possible to isolate those applications in
  489. their own address space using seccomp. Once seccomp is
  490. enabled via /proc/<pid>/seccomp, it cannot be disabled
  491. and the task is only allowed to execute a few safe syscalls
  492. defined by each seccomp mode.
  493. If unsure, say Y. Only embedded should say N here.
  494. endmenu
  495. config ISA_DMA_API
  496. bool
  497. default !PPC_ISERIES || PCI
  498. menu "Bus options"
  499. config ISA
  500. bool "Support for ISA-bus hardware"
  501. depends on PPC_PREP || PPC_CHRP
  502. select PPC_I8259
  503. help
  504. Find out whether you have ISA slots on your motherboard. ISA is the
  505. name of a bus system, i.e. the way the CPU talks to the other stuff
  506. inside your box. If you have an Apple machine, say N here; if you
  507. have an IBM RS/6000 or pSeries machine or a PReP machine, say Y. If
  508. you have an embedded board, consult your board documentation.
  509. config ZONE_DMA
  510. bool
  511. default y
  512. config GENERIC_ISA_DMA
  513. bool
  514. depends on PPC64 || POWER4 || 6xx && !CPM2
  515. default y
  516. config PPC_INDIRECT_PCI
  517. bool
  518. depends on PCI
  519. default y if 40x || 44x
  520. default n
  521. config EISA
  522. bool
  523. config SBUS
  524. bool
  525. config FSL_SOC
  526. bool
  527. config FSL_PCI
  528. bool
  529. select PPC_INDIRECT_PCI
  530. select PCI_QUIRKS
  531. config 4xx_SOC
  532. bool
  533. config FSL_LBC
  534. bool
  535. help
  536. Freescale Localbus support
  537. config FSL_GTM
  538. bool
  539. depends on PPC_83xx || QUICC_ENGINE || CPM2
  540. help
  541. Freescale General-purpose Timers support
  542. # Yes MCA RS/6000s exist but Linux-PPC does not currently support any
  543. config MCA
  544. bool
  545. # Platforms that what PCI turned unconditionally just do select PCI
  546. # in their config node. Platforms that want to choose at config
  547. # time should select PPC_PCI_CHOICE
  548. config PPC_PCI_CHOICE
  549. bool
  550. config PCI
  551. bool "PCI support" if PPC_PCI_CHOICE
  552. default y if !40x && !CPM2 && !8xx && !PPC_83xx \
  553. && !PPC_85xx && !PPC_86xx
  554. default PCI_PERMEDIA if !4xx && !CPM2 && !8xx
  555. default PCI_QSPAN if !4xx && !CPM2 && 8xx
  556. select ARCH_SUPPORTS_MSI
  557. help
  558. Find out whether your system includes a PCI bus. PCI is the name of
  559. a bus system, i.e. the way the CPU talks to the other stuff inside
  560. your box. If you say Y here, the kernel will include drivers and
  561. infrastructure code to support PCI bus devices.
  562. config PCI_DOMAINS
  563. def_bool PCI
  564. config PCI_SYSCALL
  565. def_bool PCI
  566. config PCI_QSPAN
  567. bool "QSpan PCI"
  568. depends on !4xx && !CPM2 && 8xx
  569. select PPC_I8259
  570. help
  571. Say Y here if you have a system based on a Motorola 8xx-series
  572. embedded processor with a QSPAN PCI interface, otherwise say N.
  573. config PCI_8260
  574. bool
  575. depends on PCI && 8260
  576. select PPC_INDIRECT_PCI
  577. default y
  578. config 8260_PCI9
  579. bool "Enable workaround for MPC826x erratum PCI 9"
  580. depends on PCI_8260 && !8272
  581. default y
  582. choice
  583. prompt "IDMA channel for PCI 9 workaround"
  584. depends on 8260_PCI9
  585. config 8260_PCI9_IDMA1
  586. bool "IDMA1"
  587. config 8260_PCI9_IDMA2
  588. bool "IDMA2"
  589. config 8260_PCI9_IDMA3
  590. bool "IDMA3"
  591. config 8260_PCI9_IDMA4
  592. bool "IDMA4"
  593. endchoice
  594. source "drivers/pci/pcie/Kconfig"
  595. source "drivers/pci/Kconfig"
  596. source "drivers/pcmcia/Kconfig"
  597. source "drivers/pci/hotplug/Kconfig"
  598. config HAS_RAPIDIO
  599. bool
  600. default n
  601. config RAPIDIO
  602. bool "RapidIO support"
  603. depends on HAS_RAPIDIO
  604. help
  605. If you say Y here, the kernel will include drivers and
  606. infrastructure code to support RapidIO interconnect devices.
  607. source "drivers/rapidio/Kconfig"
  608. endmenu
  609. menu "Advanced setup"
  610. depends on PPC32
  611. config ADVANCED_OPTIONS
  612. bool "Prompt for advanced kernel configuration options"
  613. help
  614. This option will enable prompting for a variety of advanced kernel
  615. configuration options. These options can cause the kernel to not
  616. work if they are set incorrectly, but can be used to optimize certain
  617. aspects of kernel memory management.
  618. Unless you know what you are doing, say N here.
  619. comment "Default settings for advanced configuration options are used"
  620. depends on !ADVANCED_OPTIONS
  621. config LOWMEM_SIZE_BOOL
  622. bool "Set maximum low memory"
  623. depends on ADVANCED_OPTIONS
  624. help
  625. This option allows you to set the maximum amount of memory which
  626. will be used as "low memory", that is, memory which the kernel can
  627. access directly, without having to set up a kernel virtual mapping.
  628. This can be useful in optimizing the layout of kernel virtual
  629. memory.
  630. Say N here unless you know what you are doing.
  631. config LOWMEM_SIZE
  632. hex "Maximum low memory size (in bytes)" if LOWMEM_SIZE_BOOL
  633. default "0x30000000"
  634. config LOWMEM_CAM_NUM_BOOL
  635. bool "Set number of CAMs to use to map low memory"
  636. depends on ADVANCED_OPTIONS && FSL_BOOKE
  637. help
  638. This option allows you to set the maximum number of CAM slots that
  639. will be used to map low memory. There are a limited number of slots
  640. available and even more limited number that will fit in the L1 MMU.
  641. However, using more entries will allow mapping more low memory. This
  642. can be useful in optimizing the layout of kernel virtual memory.
  643. Say N here unless you know what you are doing.
  644. config LOWMEM_CAM_NUM
  645. depends on FSL_BOOKE
  646. int "Number of CAMs to use to map low memory" if LOWMEM_CAM_NUM_BOOL
  647. default 3
  648. config RELOCATABLE
  649. bool "Build a relocatable kernel (EXPERIMENTAL)"
  650. depends on EXPERIMENTAL && ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
  651. help
  652. This builds a kernel image that is capable of running at the
  653. location the kernel is loaded at (some alignment restrictions may
  654. exist).
  655. One use is for the kexec on panic case where the recovery kernel
  656. must live at a different physical address than the primary
  657. kernel.
  658. Note: If CONFIG_RELOCATABLE=y, then the kernel runs from the address
  659. it has been loaded at and the compile time physical addresses
  660. CONFIG_PHYSICAL_START is ignored. However CONFIG_PHYSICAL_START
  661. setting can still be useful to bootwrappers that need to know the
  662. load location of the kernel (eg. u-boot/mkimage).
  663. config PAGE_OFFSET_BOOL
  664. bool "Set custom page offset address"
  665. depends on ADVANCED_OPTIONS
  666. help
  667. This option allows you to set the kernel virtual address at which
  668. the kernel will map low memory. This can be useful in optimizing
  669. the virtual memory layout of the system.
  670. Say N here unless you know what you are doing.
  671. config PAGE_OFFSET
  672. hex "Virtual address of memory base" if PAGE_OFFSET_BOOL
  673. default "0xc0000000"
  674. config KERNEL_START_BOOL
  675. bool "Set custom kernel base address"
  676. depends on ADVANCED_OPTIONS
  677. help
  678. This option allows you to set the kernel virtual address at which
  679. the kernel will be loaded. Normally this should match PAGE_OFFSET
  680. however there are times (like kdump) that one might not want them
  681. to be the same.
  682. Say N here unless you know what you are doing.
  683. config KERNEL_START
  684. hex "Virtual address of kernel base" if KERNEL_START_BOOL
  685. default PAGE_OFFSET if PAGE_OFFSET_BOOL
  686. default "0xc2000000" if CRASH_DUMP
  687. default "0xc0000000"
  688. config PHYSICAL_START_BOOL
  689. bool "Set physical address where the kernel is loaded"
  690. depends on ADVANCED_OPTIONS && FLATMEM && FSL_BOOKE
  691. help
  692. This gives the physical address where the kernel is loaded.
  693. Say N here unless you know what you are doing.
  694. config PHYSICAL_START
  695. hex "Physical address where the kernel is loaded" if PHYSICAL_START_BOOL
  696. default "0x02000000" if PPC_STD_MMU && CRASH_DUMP
  697. default "0x00000000"
  698. config PHYSICAL_ALIGN
  699. hex
  700. default "0x04000000" if FSL_BOOKE
  701. help
  702. This value puts the alignment restrictions on physical address
  703. where kernel is loaded and run from. Kernel is compiled for an
  704. address which meets above alignment restriction.
  705. config TASK_SIZE_BOOL
  706. bool "Set custom user task size"
  707. depends on ADVANCED_OPTIONS
  708. help
  709. This option allows you to set the amount of virtual address space
  710. allocated to user tasks. This can be useful in optimizing the
  711. virtual memory layout of the system.
  712. Say N here unless you know what you are doing.
  713. config TASK_SIZE
  714. hex "Size of user task space" if TASK_SIZE_BOOL
  715. default "0x80000000" if PPC_PREP || PPC_8xx
  716. default "0xc0000000"
  717. config CONSISTENT_SIZE_BOOL
  718. bool "Set custom consistent memory pool size"
  719. depends on ADVANCED_OPTIONS && NOT_COHERENT_CACHE
  720. help
  721. This option allows you to set the size of the
  722. consistent memory pool. This pool of virtual memory
  723. is used to make consistent memory allocations.
  724. config CONSISTENT_SIZE
  725. hex "Size of consistent memory pool" if CONSISTENT_SIZE_BOOL
  726. default "0x00200000" if NOT_COHERENT_CACHE
  727. config PIN_TLB
  728. bool "Pinned Kernel TLBs (860 ONLY)"
  729. depends on ADVANCED_OPTIONS && 8xx
  730. endmenu
  731. if PPC64
  732. config RELOCATABLE
  733. bool "Build a relocatable kernel"
  734. help
  735. This builds a kernel image that is capable of running anywhere
  736. in the RMA (real memory area) at any 16k-aligned base address.
  737. The kernel is linked as a position-independent executable (PIE)
  738. and contains dynamic relocations which are processed early
  739. in the bootup process.
  740. One use is for the kexec on panic case where the recovery kernel
  741. must live at a different physical address than the primary
  742. kernel.
  743. config PAGE_OFFSET
  744. hex
  745. default "0xc000000000000000"
  746. config KERNEL_START
  747. hex
  748. default "0xc000000000000000"
  749. config PHYSICAL_START
  750. hex
  751. default "0x00000000"
  752. endif
  753. source "net/Kconfig"
  754. source "drivers/Kconfig"
  755. source "fs/Kconfig"
  756. source "arch/powerpc/sysdev/qe_lib/Kconfig"
  757. source "lib/Kconfig"
  758. source "arch/powerpc/Kconfig.debug"
  759. source "security/Kconfig"
  760. config KEYS_COMPAT
  761. bool
  762. depends on COMPAT && KEYS
  763. default y
  764. source "crypto/Kconfig"
  765. config PPC_CLOCK
  766. bool
  767. default n
  768. select HAVE_CLK
  769. config PPC_LIB_RHEAP
  770. bool
  771. source "arch/powerpc/kvm/Kconfig"