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docs: Document parameters passed to firmware and alignment requirement

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This updates documentation to describe parameters passed to firmware
from previous booting stage, and corresponding address alignment
requirement.

This also fixes a typo in fw_dynamic.md (it's => its).

Signed-off-by: Bin Meng <bmeng.cn@gmail.com>
Reviewed-by: Anup Patel <anup.patel@wdc.com>
This commit is contained in:
Bin Meng
2021-07-10 22:28:21 +08:00
committed by Anup Patel
parent 8a1475b5a1
commit a4555e5698
2 changed files with 10 additions and 2 deletions
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docs/firmware/fw_dynamic.md
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@@ -6,8 +6,9 @@ information about next booting stage (e.g. a bootloader or an OS) and runtime
OpenSBI library options from previous booting stage.
The previous booting stage will pass information to *FW_DYNAMIC* by creating
*struct fw_dynamic_info* in memory and passing it's address to *FW_DYNAMIC*
via *a2* register of RISC-V CPU.
*struct fw_dynamic_info* in memory and passing its address to *FW_DYNAMIC*
via *a2* register of RISC-V CPU. The address must be aligned to 8 bytes on
RV64 and 4 bytes on RV32.
A *FW_DYNAMIC* firmware is particularly useful when the booting stage executed
prior to OpenSBI firmware is capable of loading both the OpenSBI firmware and