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H A Dentrypoint.S56055e87b0a756d4756a22ed26b855fbe7afe93c Mon Apr 17 12:47:40 UTC 2023 Stephan Gerhold <stephan@gerhold.net> fix(bl32): avoid clearing argument registers in RESET_TO_SP_MIN case

RESET_TO_SP_MIN is also used by platforms with a non TF-A bootloader,
in which case there might be platform-specific arguments passed in the
CPU registers. At the moment these are cleared and cannot be used by
the platform layer.

For BL31 this was recently changed in "fix(bl31): avoid clearing of
argument registers in RESET_TO_BL31 case", but on AArch32 SP_MIN still
has the old behavior.

Make this consistent by preserving the registers in SP_MIN as well
and use the chance to clarify the existing comments a bit.

Change-Id: I0039c72477249eed76c3da23cb4f10ac59b310d0
Signed-off-by: Stephan Gerhold <stephan@gerhold.net>