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docs: Add platform support guide

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This patch adds initial platform support guide (i.e.
docs/platform_guide.md).

Signed-off-by: Anup Patel <anup.patel@wdc.com>
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Anup Patel 2019-01-29 17:56:14 +05:30 • committed by Anup Patel
parent 130230ff59
commit 27b55bb4da
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OpenSBI Platform Support Guideline
==================================
The OpenSBI platform support is a set of platform specific hooks provided
in the form of a *struct sbi_platform* instance. It is required by:
1. *libplatsbi.a* - A platform specific OpenSBI static library, that is,
libsbi.a plus a *struct sbi_platform* instance installed at
*<install_directory>/platform/<platform_subdir>/lib/libplatsbi.a*
2. *firmwares* - Platform specific bootable firmware binaries installed at
*<install_directory>/platform/<platform_subdir>/bin*
A complete doxygen-style documentation of *struct sbi_platform* and related
APIs is available in sbi/sbi_platform.h.
Adding a new platform support
-----------------------------
The support of a new platform named *<xyz>* can be added as follows:
1. Create a directory named *<xyz>* under *platform/* directory
2. Create a platform configuration file named *config.mk* under
*platform/<xyz>/* directory. This configuration file will provide
compiler flags, select common drivers, and select firmware options
3. Create *platform/<xyz>/objects.mk* file for listing the platform
specific object files to be compiled
4. Create *platform/<xyz>/platform.c* file providing a *struct sbi_platform*
instance
A template platform support code is available under the *platform/template*.
Copying this directory as new directory named *<xyz>* under *platform/*
directory will create all the files mentioned above.