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opensbi/docs/blob/fw_jump.md
Anup Patel 33ec85c9ab docs: Add documentation for firmware blobs 
This patch adds documentation for fw_jump and fw_payload
firmware blobs.

Signed-off-by: Anup Patel <anup.patel@wdc.com>
2018-12-21 07:28:33 +05:30

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OpenSBI Firmware with Jump Address(FW_JUMP)

The OpenSBI firmware with Jump Address (FW_JUMP) is a firmware which only know the address of next booting stage (i.e. bootloader/kernel).

This FW_JUMP firmware is particularly useful when booting stage prior to OpenSBI firmware is capable of loading OpenSBI firmware and booting stage after OpenSBI firmware separately.

How to Enable?

The FW_JUMP firmware can be enabled by any of the following methods:

  1. Passing FW_JUMP=y command-line parameter to top-level make
  2. Setting FW_JUMP=y in platform config.mk

Config Options

We need more config details for FW_JUMP firmware to work correctly. These config details can be passed as paramter to top-level make or can be set in platform config.mk.

Following are the config options for FW_JUMP firmware:

  • FW_JUMP_ADDR - Address where next booting stage is located. This is a mandatory config option and will result in compile error if not provided.
  • FW_JUMP_FDT_ADDR - Address where FDT passed by prior booting stage will be placed before passing to next booting stage. If this option is not provided then firmware will pass zero as FDT address to next booting stage.