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diff --git a/docs/platform/generic.md b/docs/platform/generic.md new file mode 100644 index 0000000..73b6fca --- /dev/null +++ b/docs/platform/generic.md @@ -0,0 +1,42 @@ +Generic Platform +================ + +The **Generic** platform is a flattened device tree (FDT) based platform +where all platform specific functionality is provided based on FDT passed +by previous booting stage. The **Generic** platform allows us to use same +OpenSBI firmware binaries on various emulators, simulators, FPGAs, and +boards. + +By default, the generic FDT platform makes following assumptions: + +1. platform FW_TEXT_START is 0x80000000 +2. platform features are default +3. platform stack size is default +4. platform has no quirks or work-arounds + +The above assumptions (except 1) can be overridden by adding special platform +callbacks which will be called based on FDT root node compatible string. + +Users of the generic FDT platform will have to ensure that: + +1. Various FDT based drivers under lib/utils directory are upto date + based on their platform requirements +2. The FDT passed by previous booting stage has DT compatible strings and + DT properties in sync with the FDT based drivers under lib/utils directory + +To build the platform-specific library and firmware images, provide the +*PLATFORM=generic* parameter to the top level `make` command. + +For custom FW_TEXT_START, we can build the platform-specific library and +firmware images by passing *PLATFORM=generic FW_TEXT_START=<custom_text_start>* +parameter to the top level `make` command. + +Platform Options +---------------- + +The *Generic* platform does not have any platform-specific options. + +RISC-V Platforms Using Generic Platform +--------------------------------------- + +To be added later. |