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| -rw-r--r-- | README.md | 19 |
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@@ -131,6 +131,25 @@ top-level make command line. These options, such as *PLATFORM_<xyz>* or *docs/platform/<platform_name>.md* files and *docs/firmware/<firmware_name>.md* files. +Building 32-bit / 64-bit OpenSBI Images +--------------------------------------- +By default, building OpenSBI generates 32-bit or 64-bit images based on the +supplied RISC-V cross-compile toolchain. For example if *CROSS_COMPILE* is set +to *riscv64-unknown-elf-*, 64-bit OpenSBI images will be generated. If building +32-bit OpenSBI images, *CROSS_COMPILE* should be set to a toolchain that is +pre-configured to generate 32-bit RISC-V codes, like *riscv32-unknown-elf-*. + +However it's possible to explicitly specify the image bits we want to build with +a given RISC-V toolchain. This can be done by setting the environment variable +*PLATFORM_RISCV_XLEN* to the desired width, for example: + +``` +export CROSS_COMPILE=riscv64-unknown-elf- +export PLATFORM_RISCV_XLEN=32 +``` + +will generate 32-bit OpenSBI images. And vice vesa. + License ------- |