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03787ff6f9
Fixes allmodconfig, allnoconfig builds
Adds highmem support
Enables build-time exception table sorting.
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Merge tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linux
Pull Xtensa fixes from Chris Zankel:
- Fixes allmodconfig, allnoconfig builds
- Adds highmem support
- Enables build-time exception table sorting.
* tag 'xtensa-next-20140503' of git://github.com/czankel/xtensa-linux:
xtensa: ISS: don't depend on CONFIG_TTY
xtensa: xt2000: drop redundant sysmem initialization
xtensa: add support for KC705
xtensa: xtfpga: introduce SoC I/O bus
xtensa: add HIGHMEM support
xtensa: optimize local_flush_tlb_kernel_range
xtensa: dump sysmem from the bootmem_init
xtensa: handle memmap kernel option
xtensa: keep sysmem banks ordered in mem_reserve
xtensa: keep sysmem banks ordered in add_sysmem_bank
xtensa: split bootparam and kernel meminfo
xtensa: enable sorting extable at build time
xtensa: export __{invalidate,flush}_dcache_range
xtensa: Export __invalidate_icache_range
374 lines
9.7 KiB
Plaintext
374 lines
9.7 KiB
Plaintext
config ZONE_DMA
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def_bool y
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config XTENSA
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def_bool y
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select ARCH_WANT_FRAME_POINTERS
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select HAVE_IDE
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select GENERIC_ATOMIC64
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select GENERIC_CLOCKEVENTS
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select VIRT_TO_BUS
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select GENERIC_IRQ_SHOW
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select GENERIC_SCHED_CLOCK
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select MODULES_USE_ELF_RELA
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select GENERIC_PCI_IOMAP
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select ARCH_WANT_IPC_PARSE_VERSION
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select ARCH_WANT_OPTIONAL_GPIOLIB
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select BUILDTIME_EXTABLE_SORT
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select CLONE_BACKWARDS
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select IRQ_DOMAIN
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select HAVE_OPROFILE
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select HAVE_FUNCTION_TRACER
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select HAVE_IRQ_TIME_ACCOUNTING
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select HAVE_PERF_EVENTS
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select COMMON_CLK
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help
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Xtensa processors are 32-bit RISC machines designed by Tensilica
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primarily for embedded systems. These processors are both
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configurable and extensible. The Linux port to the Xtensa
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architecture supports all processor configurations and extensions,
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with reasonable minimum requirements. The Xtensa Linux project has
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a home page at <http://www.linux-xtensa.org/>.
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config RWSEM_XCHGADD_ALGORITHM
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def_bool y
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config GENERIC_HWEIGHT
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def_bool y
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config ARCH_HAS_ILOG2_U32
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def_bool n
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config ARCH_HAS_ILOG2_U64
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def_bool n
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config NO_IOPORT_MAP
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def_bool n
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config HZ
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int
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default 100
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source "init/Kconfig"
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source "kernel/Kconfig.freezer"
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config LOCKDEP_SUPPORT
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def_bool y
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config STACKTRACE_SUPPORT
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def_bool y
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config TRACE_IRQFLAGS_SUPPORT
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def_bool y
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config MMU
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def_bool n
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config VARIANT_IRQ_SWITCH
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def_bool n
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config HAVE_XTENSA_GPIO32
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def_bool n
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config MAY_HAVE_SMP
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def_bool n
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menu "Processor type and features"
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choice
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prompt "Xtensa Processor Configuration"
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default XTENSA_VARIANT_FSF
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config XTENSA_VARIANT_FSF
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bool "fsf - default (not generic) configuration"
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select MMU
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config XTENSA_VARIANT_DC232B
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bool "dc232b - Diamond 232L Standard Core Rev.B (LE)"
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select MMU
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select HAVE_XTENSA_GPIO32
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help
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This variant refers to Tensilica's Diamond 232L Standard core Rev.B (LE).
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config XTENSA_VARIANT_DC233C
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bool "dc233c - Diamond 233L Standard Core Rev.C (LE)"
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select MMU
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select HAVE_XTENSA_GPIO32
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help
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This variant refers to Tensilica's Diamond 233L Standard core Rev.C (LE).
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config XTENSA_VARIANT_S6000
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bool "s6000 - Stretch software configurable processor"
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select VARIANT_IRQ_SWITCH
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select ARCH_REQUIRE_GPIOLIB
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select XTENSA_CALIBRATE_CCOUNT
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endchoice
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config XTENSA_UNALIGNED_USER
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bool "Unaligned memory access in use space"
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help
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The Xtensa architecture currently does not handle unaligned
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memory accesses in hardware but through an exception handler.
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Per default, unaligned memory accesses are disabled in user space.
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Say Y here to enable unaligned memory access in user space.
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source "kernel/Kconfig.preempt"
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config HAVE_SMP
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bool "System Supports SMP (MX)"
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depends on MAY_HAVE_SMP
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select XTENSA_MX
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help
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This option is use to indicate that the system-on-a-chip (SOC)
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supports Multiprocessing. Multiprocessor support implemented above
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the CPU core definition and currently needs to be selected manually.
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Multiprocessor support in implemented with external cache and
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interrupt controlers.
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The MX interrupt distributer adds Interprocessor Interrupts
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and causes the IRQ numbers to be increased by 4 for devices
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like the open cores ethernet driver and the serial interface.
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You still have to select "Enable SMP" to enable SMP on this SOC.
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config SMP
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bool "Enable Symmetric multi-processing support"
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depends on HAVE_SMP
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select GENERIC_SMP_IDLE_THREAD
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help
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Enabled SMP Software; allows more than one CPU/CORE
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to be activated during startup.
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config NR_CPUS
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depends on SMP
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int "Maximum number of CPUs (2-32)"
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range 2 32
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default "4"
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config HOTPLUG_CPU
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bool "Enable CPU hotplug support"
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depends on SMP
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help
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Say Y here to allow turning CPUs off and on. CPUs can be
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controlled through /sys/devices/system/cpu.
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Say N if you want to disable CPU hotplug.
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config MATH_EMULATION
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bool "Math emulation"
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help
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Can we use information of configuration file?
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config INITIALIZE_XTENSA_MMU_INSIDE_VMLINUX
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bool "Initialize Xtensa MMU inside the Linux kernel code"
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default y
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help
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Earlier version initialized the MMU in the exception vector
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before jumping to _startup in head.S and had an advantage that
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it was possible to place a software breakpoint at 'reset' and
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then enter your normal kernel breakpoints once the MMU was mapped
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to the kernel mappings (0XC0000000).
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This unfortunately doesn't work for U-Boot and likley also wont
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work for using KEXEC to have a hot kernel ready for doing a
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KDUMP.
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So now the MMU is initialized in head.S but it's necessary to
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use hardware breakpoints (gdb 'hbreak' cmd) to break at _startup.
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xt-gdb can't place a Software Breakpoint in the 0XD region prior
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to mapping the MMU and after mapping even if the area of low memory
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was mapped gdb wouldn't remove the breakpoint on hitting it as the
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PC wouldn't match. Since Hardware Breakpoints are recommended for
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Linux configurations it seems reasonable to just assume they exist
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and leave this older mechanism for unfortunate souls that choose
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not to follow Tensilica's recommendation.
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Selecting this will cause U-Boot to set the KERNEL Load and Entry
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address at 0x00003000 instead of the mapped std of 0xD0003000.
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If in doubt, say Y.
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config HIGHMEM
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bool "High Memory Support"
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help
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Linux can use the full amount of RAM in the system by
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default. However, the default MMUv2 setup only maps the
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lowermost 128 MB of memory linearly to the areas starting
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at 0xd0000000 (cached) and 0xd8000000 (uncached).
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When there are more than 128 MB memory in the system not
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all of it can be "permanently mapped" by the kernel.
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The physical memory that's not permanently mapped is called
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"high memory".
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If you are compiling a kernel which will never run on a
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machine with more than 128 MB total physical RAM, answer
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N here.
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If unsure, say Y.
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endmenu
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config XTENSA_CALIBRATE_CCOUNT
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def_bool n
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help
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On some platforms (XT2000, for example), the CPU clock rate can
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vary. The frequency can be determined, however, by measuring
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against a well known, fixed frequency, such as an UART oscillator.
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config SERIAL_CONSOLE
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def_bool n
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menu "Bus options"
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config PCI
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bool "PCI support"
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default y
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help
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Find out whether you have a PCI motherboard. PCI is the name of a
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bus system, i.e. the way the CPU talks to the other stuff inside
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your box. Other bus systems are ISA, EISA, MicroChannel (MCA) or
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VESA. If you have PCI, say Y, otherwise N.
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source "drivers/pci/Kconfig"
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endmenu
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menu "Platform options"
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choice
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prompt "Xtensa System Type"
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default XTENSA_PLATFORM_ISS
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config XTENSA_PLATFORM_ISS
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bool "ISS"
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select XTENSA_CALIBRATE_CCOUNT
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select SERIAL_CONSOLE
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help
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ISS is an acronym for Tensilica's Instruction Set Simulator.
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config XTENSA_PLATFORM_XT2000
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bool "XT2000"
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help
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XT2000 is the name of Tensilica's feature-rich emulation platform.
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This hardware is capable of running a full Linux distribution.
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config XTENSA_PLATFORM_S6105
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bool "S6105"
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select SERIAL_CONSOLE
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select NO_IOPORT_MAP
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config XTENSA_PLATFORM_XTFPGA
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bool "XTFPGA"
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select SERIAL_CONSOLE
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select ETHOC
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select XTENSA_CALIBRATE_CCOUNT
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help
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XTFPGA is the name of Tensilica board family (LX60, LX110, LX200, ML605).
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This hardware is capable of running a full Linux distribution.
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endchoice
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config XTENSA_CPU_CLOCK
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int "CPU clock rate [MHz]"
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depends on !XTENSA_CALIBRATE_CCOUNT
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default 16
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config GENERIC_CALIBRATE_DELAY
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bool "Auto calibration of the BogoMIPS value"
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help
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The BogoMIPS value can easily be derived from the CPU frequency.
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config CMDLINE_BOOL
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bool "Default bootloader kernel arguments"
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config CMDLINE
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string "Initial kernel command string"
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depends on CMDLINE_BOOL
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default "console=ttyS0,38400 root=/dev/ram"
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help
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On some architectures (EBSA110 and CATS), there is currently no way
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for the boot loader to pass arguments to the kernel. For these
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architectures, you should supply some command-line options at build
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time by entering them here. As a minimum, you should specify the
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memory size and the root device (e.g., mem=64M root=/dev/nfs).
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config USE_OF
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bool "Flattened Device Tree support"
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select OF
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select OF_EARLY_FLATTREE
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help
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Include support for flattened device tree machine descriptions.
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config BUILTIN_DTB
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string "DTB to build into the kernel image"
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depends on OF
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config BLK_DEV_SIMDISK
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tristate "Host file-based simulated block device support"
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default n
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depends on XTENSA_PLATFORM_ISS
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help
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Create block devices that map to files in the host file system.
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Device binding to host file may be changed at runtime via proc
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interface provided the device is not in use.
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config BLK_DEV_SIMDISK_COUNT
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int "Number of host file-based simulated block devices"
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range 1 10
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depends on BLK_DEV_SIMDISK
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default 2
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help
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This is the default minimal number of created block devices.
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Kernel/module parameter 'simdisk_count' may be used to change this
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value at runtime. More file names (but no more than 10) may be
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specified as parameters, simdisk_count grows accordingly.
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config SIMDISK0_FILENAME
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string "Host filename for the first simulated device"
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depends on BLK_DEV_SIMDISK = y
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default ""
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help
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Attach a first simdisk to a host file. Conventionally, this file
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contains a root file system.
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config SIMDISK1_FILENAME
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string "Host filename for the second simulated device"
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depends on BLK_DEV_SIMDISK = y && BLK_DEV_SIMDISK_COUNT != 1
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default ""
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help
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Another simulated disk in a host file for a buildroot-independent
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storage.
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source "mm/Kconfig"
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source "drivers/pcmcia/Kconfig"
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source "drivers/pci/hotplug/Kconfig"
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endmenu
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menu "Executable file formats"
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source "fs/Kconfig.binfmt"
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endmenu
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source "net/Kconfig"
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source "drivers/Kconfig"
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source "fs/Kconfig"
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source "arch/xtensa/Kconfig.debug"
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source "security/Kconfig"
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source "crypto/Kconfig"
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source "lib/Kconfig"
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