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https://github.com/riscv-software-src/opensbi
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0723bab8fe
We update all documentation files to: 1) Remove references to platform specific config.mk file since it is has been removed. 2) Add details about platform specific configs/defconfig and Kconfig files mandatory for each platform. 3) Add required packages in top-level README.md 4) Fix typo releated to object.mk in docs/platform/platform.md Signed-off-by: Anup Patel <apatel@ventanamicro.com> Reviewed-by: Andrew Jones <ajones@ventanamicro.com> Tested-by: Andrew Jones <ajones@ventanamicro.com> Acked-by: Atish Patra <atishp@rivosinc.com> Tested-by: Atish Patra <atishp@rivosinc.com>
44 lines
2.2 KiB
Markdown
44 lines
2.2 KiB
Markdown
OpenSBI Platform Support Guideline
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==================================
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The OpenSBI platform support allows an implementation to define a set of
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platform-specific hooks (hardware manipulation functions) in the form of a
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*struct sbi_platform* data structure instance. This instance is required by
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the platform-independent *libsbi.a* to execute platform-specific operations.
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Each of the reference platform supports provided by OpenSBI defines an instance
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of the *struct sbi_platform* data structure. For each supported platform,
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*libplatsbi.a* integrates this instance with *libsbi.a* to create a
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platform-specific OpenSBI static library. This library is installed
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in *<install_directory>/platform/<platform_subdir>/lib/libplatsbi.a*
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OpenSBI also provides implementation examples of bootable runtime firmwares for
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the supported platforms. These firmwares are linked against *libplatsbi.a*.
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Firmware binaries are installed in
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*<install_directory>/platform/<platform_subdir>/bin*. These firmwares can be
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used as executable runtime firmwares on the supported platforms as a replacement
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for the legacy *riscv-pk* boot loader (BBL).
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A complete doxygen-style documentation of *struct sbi_platform* and related
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APIs is available in the file *include/sbi/sbi_platform.h*.
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Adding support for a new platform
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---------------------------------
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Support for a new platform named *<xyz>* can be added as follows:
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1. Create a directory named *<xyz>* under the *platform/* directory.
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2. Create platform configuration files named *Kconfig* and *configs/defconfig*
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under the *platform/<xyz>/* directory. These configuration files will
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provide the build time configuration for the sources to be compiled.
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3. Create a *platform/<xyz>/objects.mk* file for listing the platform
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object files to be compiled. This file also provides platform-specific
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compiler flags, and select firmware options.
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4. Create a *platform/<xyz>/platform.c* file providing a
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*struct sbi_platform* instance.
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A platform support code template is available under the *platform/template*
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directory. Copying this directory and its content as a new directory named
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*<xyz>* under the *platform/* directory will create all the files
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mentioned above.
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