配置和編譯
OpenSBI的配置選項(xiàng)位于不同平臺(tái)下的config.mk
文件,例如platform/generic/config.mk
:
# Blobs to build
FW_TEXT_START=0x80000000
FW_DYNAMIC=y
FW_JUMP=y
FW_PAYLOAD=y
ifeq ($(PLATFORM_RISCV_XLEN), 32)
# This needs to be 4MB aligned for 32-bit system
FW_JUMP_ADDR=$(shell printf "0x%X" $$(($(FW_TEXT_START) + 0x400000)))
else
# This needs to be 2MB aligned for 64-bit system
FW_JUMP_ADDR=$(shell printf "0x%X" $$(($(FW_TEXT_START) + 0x200000)))
endif
FW_JUMP_FDT_ADDR=$(shell printf "0x%X" $$(($(FW_TEXT_START) + 0x2200000)))
ifeq ($(PLATFORM_RISCV_XLEN), 32)
# This needs to be 4MB aligned for 32-bit system
FW_PAYLOAD_OFFSET=0x400000
else
# This needs to be 2MB aligned for 64-bit system
FW_PAYLOAD_OFFSET=0x200000
endif
FW_PAYLOAD_FDT_ADDR=$(FW_JUMP_FDT_ADDR)
選擇編譯需要的固件類型:
三種固件,根據(jù)自己的需求,在對(duì)應(yīng)的固件類型配置為y:
FW_DYNAMIC
=yFW_JUMP
=yFW_PAYLOAD
=y
默認(rèn)三種固件類型都編譯。
FW_TEXT_START
OpenSBI的運(yùn)行地址,需要把OpenSBI下載到FW_TEXT_START指定的地址才能運(yùn)行
FW_JUMP_ADDR
FW_JUMP固件的跳轉(zhuǎn)地址,對(duì)于RV32需要4M對(duì)齊,對(duì)于RV64需要2M對(duì)齊
FW_PAYLOAD_OFFSET
FW_PAYLOAD固件的偏移地址,對(duì)于RV32需要4對(duì)齊,對(duì)于RV64需要2M對(duì)齊
FW_JUMP_FDT_ADDR
和FW_PAYLOAD_FDT_ADDR
設(shè)備樹(shù)的地址
這里可能有個(gè)疑問(wèn):為什么跳轉(zhuǎn)地址/偏移地址需要2M對(duì)齊或4M對(duì)齊?這個(gè)跟RISC-V Linux啟動(dòng)時(shí)建立的頁(yè)表有關(guān),需要深入分析才知道。
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