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