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diff --git a/docs/firmware/fw_jump.md b/docs/firmware/fw_jump.md new file mode 100644 index 0000000..ee6ad0d --- /dev/null +++ b/docs/firmware/fw_jump.md @@ -0,0 +1,37 @@ +OpenSBI Firmware with Jump Address(FW_JUMP) +=========================================== + +The **OpenSBI firmware with Jump Address (FW_JUMP)** is a +firmware which only know the address of next booting stage +(i.e. bootloader/kernel). + +This **FW_JUMP** firmware is particularly useful when booting +stage prior to OpenSBI firmware is capable of loading OpenSBI +firmware and booting stage after OpenSBI firmware separately. + +How to Enable? +-------------- + +The **FW_JUMP** firmware can be enabled by any of the following +methods: + +1. Passing `FW_JUMP=y` command-line parameter to +top-level `make` +2. Setting `FW_JUMP=y` in platform `config.mk` + +Config Options +-------------- + +We need more config details for **FW_JUMP** firmware to work +correctly. These config details can be passed as paramter to +top-level `make` or can be set in platform `config.mk`. + +Following are the config options for **FW_JUMP** firmware: + +* **FW_JUMP_ADDR** - Address where next booting stage is +located. This is a mandatory config option and will result +in compile error if not provided. +* **FW_JUMP_FDT_ADDR** - Address where FDT passed by prior +booting stage will be placed before passing to next booting +stage. If this option is not provided then firmware will pass +zero as FDT address to next booting stage.
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