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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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2
package/binutils/Config.in.host
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@@ -12,9 +12,11 @@ choice
config BR2_BINUTILS_VERSION_2_28_X
bool "binutils 2.28.1"
depends on !BR2_arc
depends on !BR2_riscv
config BR2_BINUTILS_VERSION_2_29_X
bool "binutils 2.29.1"
depends on !BR2_riscv
config BR2_BINUTILS_VERSION_2_30_X
bool "binutils 2.30"