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arch: add support for RISC-V 64-bit (riscv64) architecture

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This enables a riscv64 system to be built with a Buildroot generated
toolchain (gcc >= 7.x, binutils >= 2.30, glibc only).

This configuration has been used to successfully build a qemu-bootable
riscv-linux-4.15 kernel (https://github.com/riscv/riscv-linux.git).

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
[Thomas:
 - simplify arch.mk.riscv by directly setting GCC_TARGET_ARCH
 - simplify glibc.mk changes by using GLIBC_CONF_ENV.]
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Mark Corbin
2018-09-12 11:22:54 +01:00
committed by Thomas Petazzoni
parent 03e2bad868
commit 9b3d52b400
9 changed files with 167 additions and 2 deletions
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5
package/linux-headers/Config.in.host
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@@ -29,22 +29,27 @@ config BR2_KERNEL_HEADERS_AS_KERNEL
config BR2_KERNEL_HEADERS_3_2
bool "Linux 3.2.x kernel headers"
depends on !BR2_aarch64 && !BR2_arc && !BR2_nios2
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_2
config BR2_KERNEL_HEADERS_4_1
bool "Linux 4.1.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_1
config BR2_KERNEL_HEADERS_4_4
bool "Linux 4.4.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_4
config BR2_KERNEL_HEADERS_4_9
bool "Linux 4.9.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_9
config BR2_KERNEL_HEADERS_4_14
bool "Linux 4.14.x kernel headers"
depends on !BR2_riscv
select BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_14
config BR2_KERNEL_HEADERS_4_16