bslathi19/buildroot
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

arch: add support for RISC-V 32-bit (riscv32) architecture

Browse Source 
This enables a riscv32 system to be built with a Buildroot generated
toolchain (gcc >= 7.x, binutils >= 2.30, glibc only).

This requires a custom version of glibc 2.26 from the riscv-glibc
repository. Note that there are no tags in this repository, so the
glibc version just consists of the 40 character commit id string.

Thanks to Fabrice Bellard for pointing me towards the 32-bit glibc
repository and for providing the necessary patch to get it to build.

Signed-off-by: Mark Corbin <mark.corbin@embecosm.com>
Reviewed-by: Matt Weber <matthew.weber@rockwellcollins.com>
Signed-off-by: Thomas Petazzoni <thomas.petazzoni@bootlin.com>
This commit is contained in:
Mark Corbin
2018-10-21 20:12:01 +01:00
committed by Thomas Petazzoni
parent 86d0ecf076
commit ae99fa6d64
7 changed files with 106 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

31
arch/Config.in.riscv
View File

@@ -65,14 +65,35 @@ config BR2_RISCV_ISA_CUSTOM_RVC
select BR2_RISCV_ISA_RVC
endif
choice
prompt "Target Architecture Size"
default BR2_RISCV_64
config BR2_RISCV_32
bool "32-bit"
config BR2_RISCV_64
bool
default y
bool "64-bit"
select BR2_ARCH_IS_64
endchoice
choice
prompt "Target ABI"
default BR2_RISCV_ABI_LP64
default BR2_RISCV_ABI_ILP32 if !BR2_ARCH_IS_64
default BR2_RISCV_ABI_LP64 if BR2_ARCH_IS_64
config BR2_RISCV_ABI_ILP32
bool "ilp32"
depends on !BR2_ARCH_IS_64
config BR2_RISCV_ABI_ILP32F
bool "ilp32f"
depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVF
config BR2_RISCV_ABI_ILP32D
bool "ilp32d"
depends on !BR2_ARCH_IS_64 && BR2_RISCV_ISA_RVD
config BR2_RISCV_ABI_LP64
bool "lp64"
@@ -88,12 +109,16 @@ config BR2_RISCV_ABI_LP64D
endchoice
config BR2_ARCH
default "riscv32" if !BR2_ARCH_IS_64
default "riscv64" if BR2_ARCH_IS_64
config BR2_ENDIAN
default "LITTLE"
config BR2_GCC_TARGET_ABI
default "ilp32" if BR2_RISCV_ABI_ILP32
default "ilp32f" if BR2_RISCV_ABI_ILP32F
default "ilp32d" if BR2_RISCV_ABI_ILP32D
default "lp64" if BR2_RISCV_ABI_LP64
default "lp64f" if BR2_RISCV_ABI_LP64F
default "lp64d" if BR2_RISCV_ABI_LP64D

4
arch/arch.mk.riscv
View File

@@ -5,8 +5,10 @@
ifeq ($(BR2_riscv),y)
ifeq ($(BR2_ARCH_IS_64),y)
ifeq ($(BR2_RISCV_64),y)
GCC_TARGET_ARCH := rv64i
else
GCC_TARGET_ARCH := rv32i
endif
ifeq ($(BR2_RISCV_ISA_RVM),y)