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README: Document 32-bit / 64-bit images build

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At present the exact details of building 32-bit or 64-bit OpenSBI
images are missing in the docs. This adds the missing part.

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Lukas Auer <lukas.auer@aisec.fraunhofer.de>
Acked-by: Anup Patel <anup.patel@wdc.com>
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Bin Meng 2019-07-23 21:29:58 -07:00 • committed by Anup Patel
parent bf2ee7bcdc
commit c90009aa20
1 changed files with 19 additions and 0 deletions
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README.md
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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
-------