buildroot/arch/Config.in
Damien Le Moal 343643fdf1 arch/config: Make RISC-V 64-bits MMU optional
Linux supports No-MMU RISC-V 64-bits since kernel version 5.8. Make
MMU optional to enable building for RISC-V 64-bits boards that do not
have one. MMU use of RISC-V 32-bits builds remains mandatory for now.

Signed-off-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Alistair Francis <alistair.francis@wdc.com>
Signed-off-by: Peter Korsgaard <peter@korsgaard.com>
2021-10-27 14:39:01 +02:00

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menu "Target options"
config BR2_ARCH_IS_64
bool
config BR2_KERNEL_64_USERLAND_32
bool
config BR2_SOFT_FLOAT
bool
config BR2_ARCH_HAS_MMU_MANDATORY
bool
config BR2_ARCH_HAS_MMU_OPTIONAL
bool
choice
prompt "Target Architecture"
default BR2_i386
help
Select the target architecture family to build for.
config BR2_arcle
bool "ARC (little endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Synopsys' DesignWare ARC Processor Cores are a family of
32-bit CPUs that can be used from deeply embedded to high
performance host applications. Little endian.
config BR2_arceb
bool "ARC (big endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Synopsys' DesignWare ARC Processor Cores are a family of
32-bit CPUs that can be used from deeply embedded to high
performance host applications. Big endian.
config BR2_arm
bool "ARM (little endian)"
# MMU support is set by the subarchitecture file, arch/Config.in.arm
help
ARM is a 32-bit reduced instruction set computer (RISC)
instruction set architecture (ISA) developed by ARM Holdings.
Little endian.
http://www.arm.com/
http://en.wikipedia.org/wiki/ARM
config BR2_armeb
bool "ARM (big endian)"
# MMU support is set by the subarchitecture file, arch/Config.in.arm
help
ARM is a 32-bit reduced instruction set computer (RISC)
instruction set architecture (ISA) developed by ARM Holdings.
Big endian.
http://www.arm.com/
http://en.wikipedia.org/wiki/ARM
config BR2_aarch64
bool "AArch64 (little endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
Aarch64 is a 64-bit architecture developed by ARM Holdings.
http://www.arm.com/products/processors/instruction-set-architectures/armv8-architecture.php
http://en.wikipedia.org/wiki/ARM
config BR2_aarch64_be
bool "AArch64 (big endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
Aarch64 is a 64-bit architecture developed by ARM Holdings.
http://www.arm.com/products/processors/instruction-set-architectures/armv8-architecture.php
http://en.wikipedia.org/wiki/ARM
config BR2_csky
bool "csky"
select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
select BR2_ARCH_HAS_MMU_MANDATORY
select BR2_ARCH_NEEDS_GCC_AT_LEAST_9
help
csky is processor IP from china.
http://www.c-sky.com/
http://www.github.com/c-sky
config BR2_i386
bool "i386"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Intel i386 architecture compatible microprocessor
http://en.wikipedia.org/wiki/I386
config BR2_m68k
bool "m68k"
# MMU support is set by the subarchitecture file, arch/Config.in.m68k
help
Motorola 68000 family microprocessor
http://en.wikipedia.org/wiki/M68k
config BR2_microblazeel
bool "Microblaze AXI (little endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Soft processor core designed for Xilinx FPGAs from Xilinx. AXI
bus based architecture (little endian)
http://www.xilinx.com
http://en.wikipedia.org/wiki/Microblaze
config BR2_microblazebe
bool "Microblaze non-AXI (big endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Soft processor core designed for Xilinx FPGAs from Xilinx. PLB
bus based architecture (non-AXI, big endian)
http://www.xilinx.com
http://en.wikipedia.org/wiki/Microblaze
config BR2_mips
bool "MIPS (big endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
MIPS is a RISC microprocessor from MIPS Technologies. Big
endian.
http://www.mips.com/
http://en.wikipedia.org/wiki/MIPS_Technologies
config BR2_mipsel
bool "MIPS (little endian)"
select BR2_ARCH_HAS_MMU_MANDATORY
help
MIPS is a RISC microprocessor from MIPS Technologies. Little
endian.
http://www.mips.com/
http://en.wikipedia.org/wiki/MIPS_Technologies
config BR2_mips64
bool "MIPS64 (big endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
MIPS is a RISC microprocessor from MIPS Technologies. Big
endian.
http://www.mips.com/
http://en.wikipedia.org/wiki/MIPS_Technologies
config BR2_mips64el
bool "MIPS64 (little endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
MIPS is a RISC microprocessor from MIPS Technologies. Little
endian.
http://www.mips.com/
http://en.wikipedia.org/wiki/MIPS_Technologies
config BR2_nds32
bool "nds32"
select BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
select BR2_ARCH_HAS_MMU_MANDATORY
help
nds32 is a 32-bit architecture developed by Andes Technology.
https://en.wikipedia.org/wiki/Andes_Technology
config BR2_nios2
bool "Nios II"
select BR2_ARCH_HAS_MMU_MANDATORY
help
Nios II is a soft core processor from Altera Corporation.
http://www.altera.com/
http://en.wikipedia.org/wiki/Nios_II
config BR2_or1k
bool "OpenRISC"
select BR2_ARCH_HAS_MMU_MANDATORY
help
OpenRISC is a free and open processor for embedded system.
http://openrisc.io
config BR2_powerpc
bool "PowerPC"
select BR2_ARCH_HAS_MMU_MANDATORY
help
PowerPC is a RISC architecture created by Apple-IBM-Motorola
alliance. Big endian.
http://www.power.org/
http://en.wikipedia.org/wiki/Powerpc
config BR2_powerpc64
bool "PowerPC64 (big endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
PowerPC is a RISC architecture created by Apple-IBM-Motorola
alliance. Big endian.
http://www.power.org/
http://en.wikipedia.org/wiki/Powerpc
config BR2_powerpc64le
bool "PowerPC64 (little endian)"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
PowerPC is a RISC architecture created by Apple-IBM-Motorola
alliance. Little endian.
http://www.power.org/
http://en.wikipedia.org/wiki/Powerpc
config BR2_riscv
bool "RISCV"
select BR2_ARCH_NEEDS_GCC_AT_LEAST_7
help
RISC-V is an open, free Instruction Set Architecture created
by the UC Berkeley Architecture Research group and supported
and promoted by RISC-V Foundation.
https://riscv.org/
https://en.wikipedia.org/wiki/RISC-V
config BR2_s390x
bool "s390x"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
s390x is a big-endian architecture made by IBM.
http://www.ibm.com/
http://en.wikipedia.org/wiki/IBM_System/390
config BR2_sh
bool "SuperH"
select BR2_ARCH_HAS_MMU_OPTIONAL
help
SuperH (or SH) is a 32-bit reduced instruction set computer
(RISC) instruction set architecture (ISA) developed by
Hitachi.
http://www.hitachi.com/
http://en.wikipedia.org/wiki/SuperH
config BR2_sparc
bool "SPARC"
select BR2_ARCH_HAS_MMU_MANDATORY
help
SPARC (from Scalable Processor Architecture) is a RISC
instruction set architecture (ISA) developed by Sun
Microsystems.
http://www.oracle.com/sun
http://en.wikipedia.org/wiki/Sparc
config BR2_sparc64
bool "SPARC64"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
SPARC (from Scalable Processor Architecture) is a RISC
instruction set architecture (ISA) developed by Sun
Microsystems.
http://www.oracle.com/sun
http://en.wikipedia.org/wiki/Sparc
config BR2_x86_64
bool "x86_64"
select BR2_ARCH_IS_64
select BR2_ARCH_HAS_MMU_MANDATORY
help
x86-64 is an extension of the x86 instruction set (Intel i386
architecture compatible microprocessor).
http://en.wikipedia.org/wiki/X86_64
config BR2_xtensa
bool "Xtensa"
# MMU support is set by the subarchitecture file, arch/Config.in.xtensa
help
Xtensa is a Tensilica processor IP architecture.
http://en.wikipedia.org/wiki/Xtensa
http://www.tensilica.com/
endchoice
# For some architectures or specific cores, our internal toolchain
# backend is not suitable (like, missing support in upstream gcc, or
# no ChipCo fork exists...)
config BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
bool
config BR2_ARCH_HAS_TOOLCHAIN_BUILDROOT
bool
default y if !BR2_ARCH_HAS_NO_TOOLCHAIN_BUILDROOT
# The following symbols are selected by the individual
# Config.in.$ARCH files
config BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
bool
config BR2_ARCH_NEEDS_GCC_AT_LEAST_4_9
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_4_8
config BR2_ARCH_NEEDS_GCC_AT_LEAST_5
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_4_9
config BR2_ARCH_NEEDS_GCC_AT_LEAST_6
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_5
config BR2_ARCH_NEEDS_GCC_AT_LEAST_7
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_6
config BR2_ARCH_NEEDS_GCC_AT_LEAST_8
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_7
config BR2_ARCH_NEEDS_GCC_AT_LEAST_9
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_8
config BR2_ARCH_NEEDS_GCC_AT_LEAST_10
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_9
config BR2_ARCH_NEEDS_GCC_AT_LEAST_11
bool
select BR2_ARCH_NEEDS_GCC_AT_LEAST_10
# The following string values are defined by the individual
# Config.in.$ARCH files
config BR2_ARCH
string
config BR2_ENDIAN
string
config BR2_GCC_TARGET_ARCH
string
config BR2_GCC_TARGET_ABI
string
config BR2_GCC_TARGET_NAN
string
config BR2_GCC_TARGET_FP32_MODE
string
config BR2_GCC_TARGET_CPU
string
# The value of this option will be passed as --with-fpu=<value> when
# building gcc (internal backend) or -mfpu=<value> in the toolchain
# wrapper (external toolchain)
config BR2_GCC_TARGET_FPU
string
# The value of this option will be passed as --with-float=<value> when
# building gcc (internal backend) or -mfloat-abi=<value> in the toolchain
# wrapper (external toolchain)
config BR2_GCC_TARGET_FLOAT_ABI
string
# The value of this option will be passed as --with-mode=<value> when
# building gcc (internal backend) or -m<value> in the toolchain
# wrapper (external toolchain)
config BR2_GCC_TARGET_MODE
string
# Must be selected by binary formats that support shared libraries.
config BR2_BINFMT_SUPPORTS_SHARED
bool
# Must match the name of the architecture from readelf point of view,
# i.e the "Machine:" field of readelf output. See get_machine_name()
# in binutils/readelf.c for the list of possible values.
config BR2_READELF_ARCH_NAME
string
# Set up target binary format
choice
prompt "Target Binary Format"
default BR2_BINFMT_ELF if BR2_USE_MMU
default BR2_BINFMT_FLAT
config BR2_BINFMT_ELF
bool "ELF"
depends on BR2_USE_MMU
select BR2_BINFMT_SUPPORTS_SHARED
help
ELF (Executable and Linkable Format) is a format for libraries
and executables used across different architectures and
operating systems.
config BR2_BINFMT_FLAT
bool "FLAT"
depends on !BR2_USE_MMU
help
FLAT binary is a relatively simple and lightweight executable
format based on the original a.out format. It is widely used
in environment where no MMU is available.
endchoice
# Set up flat binary type
choice
prompt "FLAT Binary type"
default BR2_BINFMT_FLAT_ONE
depends on BR2_BINFMT_FLAT
config BR2_BINFMT_FLAT_ONE
bool "One memory region"
help
All segments are linked into one memory region.
config BR2_BINFMT_FLAT_SHARED
bool "Shared binary"
depends on BR2_m68k
# Even though this really generates shared binaries, there is no libdl
# and dlopen() cannot be used. So packages that require shared
# libraries cannot be built. Therefore, we don't select
# BR2_BINFMT_SUPPORTS_SHARED and therefore force BR2_STATIC_LIBS.
# Although this adds -static to the compilation, that's not a problem
# because the -mid-shared-library option overrides it.
help
Allow to load and link indiviual FLAT binaries at run time.
endchoice
if BR2_arcle || BR2_arceb
source "arch/Config.in.arc"
endif
if BR2_arm || BR2_armeb || BR2_aarch64 || BR2_aarch64_be
source "arch/Config.in.arm"
endif
if BR2_csky
source "arch/Config.in.csky"
endif
if BR2_m68k
source "arch/Config.in.m68k"
endif
if BR2_microblazeel || BR2_microblazebe
source "arch/Config.in.microblaze"
endif
if BR2_mips || BR2_mips64 || BR2_mipsel || BR2_mips64el
source "arch/Config.in.mips"
endif
if BR2_nds32
source "arch/Config.in.nds32"
endif
if BR2_nios2
source "arch/Config.in.nios2"
endif
if BR2_or1k
source "arch/Config.in.or1k"
endif
if BR2_powerpc || BR2_powerpc64 || BR2_powerpc64le
source "arch/Config.in.powerpc"
endif
if BR2_riscv
source "arch/Config.in.riscv"
endif
if BR2_s390x
source "arch/Config.in.s390x"
endif
if BR2_sh
source "arch/Config.in.sh"
endif
if BR2_sparc || BR2_sparc64
source "arch/Config.in.sparc"
endif
if BR2_i386 || BR2_x86_64
source "arch/Config.in.x86"
endif
if BR2_xtensa
source "arch/Config.in.xtensa"
endif
endmenu # Target options