[PATCH] riscv: Makefile: make it possible to use riscv64 compiler

[Antony Pavlov]

At the moment riscv64 toolchain can't be used to build
barebox for riscv32, e.g.

  barebox$ make erizo_generic_defconfig
  ...
  barebox$ make
  ...
  riscv64-zephyr-elf-ld:
  common/memory.o: ABI is incompatible with that of the selected
  emulation:
    target emulation `elf32-littleriscv' does not match `elf64-littleriscv'

The patch fixes the problem by explicit riscv32 target options selection.

Signed-off-by: Antony Pavlov <antonynpavlov at gmail.com>
Cc: Masahiro Yamada <masahiroy at kernel.org>
---
 arch/riscv/Makefile | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index c71319507c..8cd5f51e30 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -3,7 +3,8 @@ KBUILD_DEFCONFIG := erizo_generic_defconfig
 KBUILD_CPPFLAGS += -fno-strict-aliasing
 
 ifeq ($(CONFIG_ARCH_RV32I),y)
-	cflags-y += -march=rv32im
+	cflags-y += -march=rv32im -mabi=ilp32
+	riscv-ldflags-y += -melf32lriscv
 endif
 
 cflags-y += -fno-pic -pipe
@@ -14,6 +15,8 @@ LDFLAGS_barebox += -nostdlib
 
 machine-$(CONFIG_MACH_ERIZO)	:= erizo
 
+LDFLAGS_barebox += $(riscv-ldflags-y)
+
 TEXT_BASE = $(CONFIG_TEXT_BASE)
 KBUILD_CPPFLAGS += -DTEXT_BASE=$(CONFIG_TEXT_BASE)
 
-- 
2.27.0