[U-Boot] [PATCH v2 07/15] riscv: Explicitly pass -march and -mabi to the compiler

[Bin Meng]

At present the compiler flag against which architecture and abi
variant the riscv image is built for is not explicitly indicated
which means the default compiler configuration is used. But this
does not work if we want to build a different target (eg: 32-bit
riscv images using a toolchain configured for 64-bit riscv).

Fix this by explicitly passing -march and -mabi to the compiler.
Since generically we don't use floating point in U-Boot, specify
the RV[32|64]IMA ISA and software floating ABI.

This also fix some alignment coding style issues.

Signed-off-by: Bin Meng <bmeng.cn at gmail.com>
---

Changes in v2: None

 arch/riscv/config.mk | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/arch/riscv/config.mk b/arch/riscv/config.mk
index 219e666..1484887 100644
--- a/arch/riscv/config.mk
+++ b/arch/riscv/config.mk
@@ -18,12 +18,16 @@ endif
 64bit-emul		:= elf64lriscv
 
 ifdef CONFIG_32BIT
+PLATFORM_CPPFLAGS	+= -march=rv32ima -mabi=ilp32
 PLATFORM_LDFLAGS	+= -m $(32bit-emul)
+CFLAGS_EFI		+= -march=rv32ima -mabi=ilp32
 EFI_LDS			:= elf_riscv32_efi.lds
 endif
 
 ifdef CONFIG_64BIT
+PLATFORM_CPPFLAGS	+= -march=rv64ima -mabi=lp64
 PLATFORM_LDFLAGS	+= -m $(64bit-emul)
+CFLAGS_EFI		+= -march=rv64ima -mabi=lp64
 EFI_LDS			:= elf_riscv64_efi.lds
 endif
 
@@ -31,8 +35,9 @@ CONFIG_STANDALONE_LOAD_ADDR = 0x00000000 \
 			      -T $(srctree)/examples/standalone/riscv.lds
 
 PLATFORM_CPPFLAGS	+= -ffixed-gp -fpic
-PLATFORM_RELFLAGS += -fno-strict-aliasing -fno-common -gdwarf-2 -ffunction-sections
-LDFLAGS_u-boot += --gc-sections -static -pie
+PLATFORM_RELFLAGS	+= -fno-strict-aliasing -fno-common -gdwarf-2 \
+			   -ffunction-sections
+LDFLAGS_u-boot		+= --gc-sections -static -pie
 
 EFI_CRT0		:= crt0_riscv_efi.o
 EFI_RELOC		:= reloc_riscv_efi.o
-- 
2.7.4