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doc: Update memory layout for firmware configuration area

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Captured the increase in firmware configuration area from
4KB to 8kB in memory layout document. Updated the documentation
to provide details about fw_config separately.

Signed-off-by: Manish V Badarkhe <Manish.Badarkhe@arm.com>
Change-Id: Ifbec443ced479301be65827b49ff4fe447e9109f
This commit is contained in:
Manish V Badarkhe 2020-06-13 09:42:28 +01:00
parent ce4ca1a8b8
commit 089fc62412
1 changed files with 10 additions and 6 deletions
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16
docs/design/firmware-design.rst
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@ -83,6 +83,10 @@ Each of the Boot Loader stages may be dynamically configured if required by the
platform. The Boot Loader stage may optionally specify a firmware
configuration file and/or hardware configuration file as listed below:
- FW_CONFIG - The firmware configuration file. Holds properties shared across
all BLx images.
An example is the "dtb-registry" node, which contains the information about
the other device tree configurations (load-address, size, image_id).
- HW_CONFIG - The hardware configuration file. Can be shared by all Boot Loader
stages and also by the Normal World Rich OS.
- TB_FW_CONFIG - Trusted Boot Firmware configuration file. Shared between BL1
@ -109,8 +113,8 @@ convention:
the generic hardware configuration is passed the next available argument.
For example,
- If TB_FW_CONFIG is loaded by BL1, then its address is passed in ``arg0``
to BL2.
- FW_CONFIG is loaded by BL1, then its address is passed in ``arg0`` to BL2.
- TB_FW_CONFIG address is retrieved by BL2 from FW_CONFIG device tree.
- If HW_CONFIG is loaded by BL1, then its address is passed in ``arg2`` to
BL2. Note, ``arg1`` is already used for meminfo_t.
- If SOC_FW_CONFIG is loaded by BL2, then its address is passed in ``arg1``
@ -1732,7 +1736,7 @@ CONFIG section in memory layouts shown below contains:
``bl2_mem_params_descs`` contains parameters passed from BL2 to next the
BL image during boot.
``fw_configs`` includes soc_fw_config, tos_fw_config and tb_fw_config.
``fw_configs`` includes soc_fw_config, tos_fw_config, tb_fw_config and fw_config.
**FVP with TSP in Trusted SRAM with firmware configs :**
(These diagrams only cover the AArch64 case)
@ -1757,7 +1761,7 @@ BL image during boot.
| | <<<<<<<<<<<<< | BL31 PROGBITS |
| | <<<<<<<<<<<<< |----------------|
| | <<<<<<<<<<<<< | BL32 |
0x04002000 +----------+ +----------------+
0x04003000 +----------+ +----------------+
| CONFIG |
0x04001000 +----------+
| Shared |
@ -1794,7 +1798,7 @@ BL image during boot.
|--------------| <<<<<<<<<<<<< |----------------|
| | <<<<<<<<<<<<< | BL31 PROGBITS |
| | +----------------+
+--------------+
0x04003000 +--------------+
| CONFIG |
0x04001000 +--------------+
| Shared |
@ -1828,7 +1832,7 @@ BL image during boot.
|----------| <<<<<<<<<<<<< |----------------|
| | <<<<<<<<<<<<< | BL31 PROGBITS |
| | +----------------+
0x04002000 +----------+
0x04003000 +----------+
| CONFIG |
0x04001000 +----------+
| Shared |