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plat/arm/juno: Add support to use hw_config in BL31

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To make it possible to use the hw_config device tree for dynamic
configuration in BL31 on the Arm Juno platform. A placeholder hw_config
has been added that is included in the FIP and a Juno specific BL31
setup has been added to populate fconf with the hw_config.

Juno's BL2 setup has been updated to align it with the new behavior
implemented in the Arm FVP platform, where fw_config is passed in arg1
to BL31 instead of soc_fw_config. The BL31 setup is expected to use the
fw_config passed in arg1 to find the hw_config.

Signed-off-by: Mikael Olsson <mikael.olsson@arm.com>
Change-Id: Ib3570faa6714f92ab8451e8f1e59779dcf19c0b6
This commit is contained in:
Mikael Olsson 2021-02-12 17:30:16 +01:00 • committed by Manish Pandey
parent a9e14e202f
commit 5d5fb10f9c
8 changed files with 142 additions and 8 deletions
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4
docs/getting_started/porting-guide.rst
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@ -1742,9 +1742,9 @@ In Arm standard platforms, the arguments received are :
which is list of executable images following BL31,
arg1 - Points to load address of SOC_FW_CONFIG if present
except in case of Arm FVP platform.
except in case of Arm FVP and Juno platform.
In case of Arm FVP platform, Points to load address
In case of Arm FVP and Juno platform, points to load address
of FW_CONFIG.
arg2 - Points to load address of HW_CONFIG if present