riscv: Add Zbb support for building U-Boot
This patch adds ISA string to the -march to generate zbb instructions
for U-Boot binaries, along with optimized string functions introduced
from Linux kernel.
Signed-off-by: Yu Chien Peter Lin <peterlin@andestech.com>
Reviewed-by: Leo Yu-Chi Liang <ycliang@andestech.com>
diff --git a/arch/riscv/Makefile b/arch/riscv/Makefile
index 4963b51..b3ef870 100644
--- a/arch/riscv/Makefile
+++ b/arch/riscv/Makefile
@@ -24,6 +24,9 @@
ifeq ($(CONFIG_RISCV_ISA_C),y)
ARCH_C = c
endif
+ifeq ($(CONFIG_RISCV_ISA_ZBB),y)
+ ARCH_ZBB = _zbb
+endif
ifeq ($(CONFIG_CMODEL_MEDLOW),y)
CMODEL = medlow
endif
@@ -32,7 +35,7 @@
endif
-RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_F)$(ARCH_D)$(ARCH_C)
+RISCV_MARCH = $(ARCH_BASE)$(ARCH_A)$(ARCH_F)$(ARCH_D)$(ARCH_C)$(ARCH_ZBB)
ABI = $(ABI_BASE)$(ABI_D)
# Newer binutils versions default to ISA spec version 20191213 which moves some