OpenSBI Firmware with Dynamic Information (FW_DYNAMIC) ====================================================== OpenSBI **firmware with dynamic info (FW_DYNAMIC)** is a firmware which gets information about next booting stage (e.g. a bootloader or an OS) and runtime OpenSBI library options from previous booting stage. The previous booting stage will pass information to *FW_DYNAMIC* by creating *struct fw_dynamic_info* in memory and passing its address to *FW_DYNAMIC* via *a2* register of RISC-V CPU. The address must be aligned to 8 bytes on RV64 and 4 bytes on RV32. A *FW_DYNAMIC* firmware is particularly useful when the booting stage executed prior to OpenSBI firmware is capable of loading both the OpenSBI firmware and the booting stage binary to follow OpenSBI firmware. *FW_DYNAMIC* Compilation ------------------------ A platform can enable *FW_DYNAMIC* firmware using any of the following methods. 1. Specifying `FW_DYNAMIC=y` on the top level `make` command line. 2. Specifying `FW_DYNAMIC=y` in the target platform *config.mk* configuration file. The compiled *FW_DYNAMIC* firmware ELF file is named *fw_dynamic.elf*. It's expanded image file is *fw_dynamic.bin*. Both files are created in the platform specific build directory under the *build/platform//firmware* directory. *FW_DYNAMIC* Firmware Configuration Options ------------------------------------------- The *FW_DYNAMIC* firmware does not requires any platform specific configuration parameters because all required information is passed by previous booting stage at runtime via *struct fw_dynamic_info*.