milkv-duo启动流程分析：手动构建fip.bin [2/2]

手动合成fip.bin和boot.sd [2/2]

编译FSBL

编译FSBL是为了得到bl2.bin。注意到我们需要配置一些参数：

ARCH ?=

ifneq ($(origin CROSS_COMPILE),command line)
ifeq ($(ARCH),riscv)
CROSS_COMPILE := ${CROSS_COMPILE_GLIBC_RISCV64}
BOOT_CPU ?= riscv
else
CROSS_COMPILE := ${CROSS_COMPILE_64}
BOOT_CPU := aarch64
ARCH := aarch64
endif
endif

ifeq (${CHIP_ARCH},)
$(error CHIP_ARCH is undefined)
endif

ifeq (${CROSS_COMPILE},)
$(error CROSS_COMPILE is undefined)
endif

我们需要

make ARCH=riscv CROSS_COMPILE=riscv64-buildroot-linux-musl- BOOT_CPU=riscv CHIP_ARCH=cv180x PROJECT_FULLNAME=cv1800b_milkv_duo_sd bl2

此时又报错：

lib/cpu/riscv/bl2_entrypoint.S: Assembler messages:
lib/cpu/riscv/bl2_entrypoint.S:60: Error: unknown CSR