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docs/firmware: document new options for jump and payload firmwares

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Adding relocatable address brings new configuration options for jump
and payload firmwares. Describe these new options in documentation.

Signed-off-by: Inochi Amaoto <inochiama@outlook.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Inochi Amaoto
2024-02-23 16:18:15 +08:00
committed by Anup Patel
parent 2cff7f350f
commit 96a35db63a
2 changed files with 19 additions and 3 deletions
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17
docs/firmware/fw_jump.md
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@@ -31,9 +31,14 @@ follows:
* **FW_JUMP_ADDR** - Address of the entry point of the booting stage to be
executed following OpenSBI firmware. This address generally corresponds
exactly to the address where this next booting stage was loaded. This is a
mandatory parameter. Compilation errors will result from not defining this
address.
exactly to the address where this next booting stage was loaded.
At least one of *FW_JUMP_ADDR* and *FW_JUMP_OFFSET* (see below) should be
defined. Compilation errors will result from not defining one of them.
* **FW_JUMP_OFFSET** - Address offset from the *FW_TEXT_START* where the
entry point of the next booting stage is located. This offset is used as
relocatable address of the next booting stage entry point. If *FW_JUMP_ADDR*
is also defined, the firmware will prefer *FW_JUMP_ADDR*.
* **FW_JUMP_FDT_ADDR** - Address where the *flattened device tree (FDT file)*
passed by the prior booting stage will be placed in memory before executing
@@ -57,6 +62,12 @@ follows:
echo fdt overlaps kernel, increase FW_JUMP_FDT_ADDR
```
* **FW_JUMP_FDT_OFFSET** - Address offset from the *FW_TEXT_START* where
the FDT will be passed to the next booting stage. This offset is used
as relocatable address of the FDT passed to the next booting stage. If
*FW_JUMP_FDT_ADDR* is also defined, the firmware will prefer
*FW_JUMP_FDT_ADDR*.
*FW_JUMP* Example
-----------------