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The upstream U-Boot/QEMU have been using generic platform for SiFive HiFive Unleashed board for some time. Let's document sifive_fu540 as one of the supported targets for "generic" platform. Signed-off-by: Bin Meng <bmeng.cn@gmail.com> Reviewed-by: Anup Patel <anup.patel@wdc.com>
59 lines
2.3 KiB
Markdown
59 lines
2.3 KiB
Markdown
Generic Platform
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================
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The **Generic** platform is a flattened device tree (FDT) based platform
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where all platform specific functionality is provided based on FDT passed
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by previous booting stage. The **Generic** platform allows us to use same
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OpenSBI firmware binaries on various emulators, simulators, FPGAs, and
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boards.
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By default, the generic FDT platform makes following assumptions:
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1. platform FW_TEXT_START is 0x80000000
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2. platform features are default
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3. platform stack size is default
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4. platform has no quirks or work-arounds
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The above assumptions (except 1) can be overridden by adding special platform
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callbacks which will be called based on FDT root node compatible string.
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Users of the generic FDT platform will have to ensure that:
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1. Various FDT based drivers under lib/utils directory are upto date
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based on their platform requirements
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2. The FDT passed by previous booting stage has DT compatible strings and
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DT properties in sync with the FDT based drivers under lib/utils directory
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3. The FDT must have "stdout-path" DT property in the "/chosen" DT node when
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a platform has multiple serial ports or consoles
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4. On multi-HART platform, the FDT must have a DT node for IPI device and
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lib/utils/ipi directory must have corresponding FDT based IPI driver
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5. The FDT must have a DT node for timer device and lib/utils/timer directory
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must have corresponding FDT based timer driver
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To build the platform-specific library and firmware images, provide the
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*PLATFORM=generic* parameter to the top level `make` command.
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For custom FW_TEXT_START, we can build the platform-specific library and
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firmware images by passing *PLATFORM=generic FW_TEXT_START=<custom_text_start>*
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parameter to the top level `make` command.
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Platform Options
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----------------
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The *Generic* platform does not have any platform-specific options.
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RISC-V Platforms Using Generic Platform
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---------------------------------------
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* **QEMU RISC-V Virt Machine** (*[qemu_virt.md]*)
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* **Shakti C-class SoC Platform** (*[shakti_cclass.md]*)
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* **SiFive HiFive Unleashed** (*[sifive_fu540.md]*)
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* **Spike** (*[spike.md]*)
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* **T-HEAD C9xx series Processors** (*[thead-c9xx.md]*)
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[qemu_virt.md]: qemu_virt.md
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[shakti_cclass.md]: shakti_cclass.md
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[sifive_fu540.md]: sifive_fu540.md
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[spike.md]: spike.md
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[thead-c9xx.md]: thead-c9xx.md
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