# # Copyright (C) 2004, 2007-2010, 2011-2012 Synopsys, Inc. (www.synopsys.com) # # This program is free software; you can redistribute it and/or modify # it under the terms of the GNU General Public License version 2 as # published by the Free Software Foundation. # config ARC def_bool y select ARCH_NO_VIRT_TO_BUS select CLONE_BACKWARDS # ARC Busybox based initramfs absolutely relies on DEVTMPFS for /dev select DEVTMPFS if !INITRAMFS_SOURCE="" select GENERIC_ATOMIC64 select GENERIC_CLOCKEVENTS select GENERIC_FIND_FIRST_BIT # for now, we don't need GENERIC_IRQ_PROBE, CONFIG_GENERIC_IRQ_CHIP select GENERIC_IRQ_SHOW select GENERIC_KERNEL_EXECVE select GENERIC_KERNEL_THREAD select GENERIC_PENDING_IRQ if SMP select GENERIC_SIGALTSTACK select GENERIC_SMP_IDLE_THREAD select HAVE_ARCH_TRACEHOOK select HAVE_GENERIC_HARDIRQS select HAVE_MEMBLOCK select IRQ_DOMAIN select MODULES_USE_ELF_RELA select NO_BOOTMEM select OF select OF_EARLY_FLATTREE config SCHED_OMIT_FRAME_POINTER def_bool y config GENERIC_CSUM def_bool y config RWSEM_GENERIC_SPINLOCK def_bool y config ARCH_FLATMEM_ENABLE def_bool y config MMU def_bool y config NO_IOPORT def_bool y config GENERIC_CALIBRATE_DELAY def_bool y config GENERIC_HWEIGHT def_bool y config BINFMT_ELF def_bool y config HAVE_LATENCYTOP_SUPPORT def_bool y config NO_DMA def_bool n source "init/Kconfig" source "kernel/Kconfig.freezer" menu "ARC Architecture Configuration" choice prompt "ARC Platform" default ARC_PLAT_FPGA_LEGACY config ARC_PLAT_FPGA_LEGACY bool "\"Legacy\" ARC FPGA dev platform" help Support for ARC development platforms, provided by Synopsys. These are based on FPGA or ISS. e.g. - ARCAngel4 - ML509 - MetaWare ISS #New platform adds here endchoice menu "ARC CPU Configuration" choice prompt "ARC Core" default ARC_CPU_770 config ARC_CPU_750D bool "ARC750D" help Support for ARC750 core config ARC_CPU_770 bool "ARC770" select ARC_CPU_REL_4_10 help Support for ARC770 core introduced with Rel 4.10 (Summer 2011) This core has a bunch of cool new features: -MMU-v3: Variable Page Sz (4k, 8k, 16k), bigger J-TLB (128x4) Shared Address Spaces (for sharing TLB entires in MMU) -Caches: New Prog Model, Region Flush -Insns: endian swap, load-locked/store-conditional, time-stamp-ctr endchoice config CPU_BIG_ENDIAN bool "Enable Big Endian Mode" default n help Build kernel for Big Endian Mode of ARC CPU menuconfig ARC_CACHE bool "Enable Cache Support" default y if ARC_CACHE config ARC_CACHE_LINE_SHIFT int "Cache Line Length (as power of 2)" range 5 7 default "6" help Starting with ARC700 4.9, Cache line length is configurable, This option specifies "N", with Line-len = 2 power N So line lengths of 32, 64, 128 are specified by 5,6,7, respectively Linux only supports same line lengths for I and D caches. config ARC_HAS_ICACHE bool "Use Instruction Cache" default y config ARC_HAS_DCACHE bool "Use Data Cache" default y config ARC_CACHE_PAGES bool "Per Page Cache Control" default y depends on ARC_HAS_ICACHE || ARC_HAS_DCACHE help This can be used to over-ride the global I/D Cache Enable on a per-page basis (but only for pages accessed via MMU such as Kernel Virtual address or User Virtual Address) TLB entries have a per-page Cache Enable Bit. Note that Global I/D ENABLE + Per Page DISABLE works but corollary Global DISABLE + Per Page ENABLE won't work endif #ARC_CACHE config ARC_HAS_HW_MPY bool "Use Hardware Multiplier (Normal or Faster XMAC)" default y help Influences how gcc generates code for MPY operations. If enabled, MPYxx insns are generated, provided by Standard/XMAC Multipler. Otherwise software multipy lib is used choice prompt "ARC700 MMU Version" default ARC_MMU_V3 if ARC_CPU_770 default ARC_MMU_V2 if ARC_CPU_750D config ARC_MMU_V1 bool "MMU v1" help Orig ARC700 MMU config ARC_MMU_V2 bool "MMU v2" help Fixed the deficiency of v1 - possible thrashing in memcpy sceanrio when 2 D-TLB and 1 I-TLB entries index into same 2way set. config ARC_MMU_V3 bool "MMU v3" depends on ARC_CPU_770 help Introduced with ARC700 4.10: New Features Variable Page size (1k-16k), var JTLB size 128 x (2 or 4) Shared Address Spaces (SASID) endchoice choice prompt "MMU Page Size" default ARC_PAGE_SIZE_8K config ARC_PAGE_SIZE_8K bool "8KB" help Choose between 8k vs 16k config ARC_PAGE_SIZE_16K bool "16KB" depends on ARC_MMU_V3 config ARC_PAGE_SIZE_4K bool "4KB" depends on ARC_MMU_V3 endchoice config ARC_FPU_SAVE_RESTORE bool "Enable FPU state persistence across context switch" default n help Double Precision Floating Point unit had dedictaed regs which need to be saved/restored across context-switch. Note that ARC FPU is overly simplistic, unlike say x86, which has hardware pieces to allow software to conditionally save/restore, based on actual usage of FPU by a task. Thus our implemn does this for all tasks in system. menuconfig ARC_CPU_REL_4_10 bool "Enable support for Rel 4.10 features" default n help -ARC770 (and dependent features) enabled -ARC750 also shares some of the new features with 770 config ARC_HAS_LLSC bool "Insn: LLOCK/SCOND (efficient atomic ops)" default y depends on ARC_CPU_770 # if SMP, enable LLSC ONLY if ARC implementation has coherent atomics depends on !SMP || ARC_HAS_COH_LLSC config ARC_HAS_SWAPE bool "Insn: SWAPE (endian-swap)" default y depends on ARC_CPU_REL_4_10 config ARC_HAS_RTSC bool "Insn: RTSC (64-bit r/o cycle counter)" default y depends on ARC_CPU_REL_4_10 endmenu # "ARC CPU Configuration" menu "Platform Board Configuration" source "arch/arc/plat-arcfpga/Kconfig" #New platform adds here config LINUX_LINK_BASE hex "Linux Link Address" default "0x80000000" help ARC700 divides the 32 bit phy address space into two equal halves -Lower 2G (0 - 0x7FFF_FFFF ) is user virtual, translated by MMU -Upper 2G (0x8000_0000 onwards) is untranslated, for kernel Typically Linux kernel is linked at the start of untransalted addr, hence the default value of 0x8zs. However some customers have peripherals mapped at this addr, so Linux needs to be scooted a bit. If you don't know what the above means, leave this setting alone. endmenu # "Platform Board Configuration" config ARC_CURR_IN_REG bool "Dedicate Register r25 for current_task pointer" default y help This reserved Register R25 to point to Current Task in kernel mode. This saves memory access for each such access config ARC_STACK_NONEXEC bool "Make stack non-executable" default n help To disable the execute permissions of stack/heap of processes which are enabled by default. config HZ int "Timer Frequency" default 100 menuconfig ARC_DBG bool "ARC debugging" default y config ARC_DBG_TLB_PARANOIA bool "Paranoia Checks in Low Level TLB Handlers" depends on ARC_DBG default n config ARC_DBG_TLB_MISS_COUNT bool "Profile TLB Misses" default n select DEBUG_FS depends on ARC_DBG help Counts number of I and D TLB Misses and exports them via Debugfs The counters can be cleared via Debugfs as well config CMDLINE string "Kernel command line to built-in" default "print-fatal-signals=1" help The default command line which will be appended to the optional u-boot provided command line (see below) config CMDLINE_UBOOT bool "Support U-boot kernel command line passing" default n help If you are using U-boot (www.denx.de) and wish to pass the kernel command line from the U-boot environment to the Linux kernel then switch this option on. ARC U-boot will setup the cmdline in RAM/flash and set r2 to point to it. kernel startup code will copy the string into cmdline buffer and also append CONFIG_CMDLINE. config ARC_BUILTIN_DTB_NAME string "Built in DTB" help Set the name of the DTB to embed in the vmlinux binary Leaving it blank selects the minimal "skeleton" dtb source "kernel/Kconfig.preempt" endmenu # "ARC Architecture Configuration" source "mm/Kconfig" source "net/Kconfig" source "drivers/Kconfig" source "fs/Kconfig" source "arch/arc/Kconfig.debug" source "security/Kconfig" source "crypto/Kconfig" source "lib/Kconfig"