[coreboot] PAYLOAD_SEGMENT_BSS not getting cleared in selfboot.c

[Aaron Durbin]

Hello,

I have a historical question regarding the current selfboot.c
implementation surrounding PAYLOAD_SEGMENT_BSS.

Documentation/cbfs.txt indicates that PAYLOAD_SEGMENT_BSS should be cleared:

"PAYLOAD_SEGMENT_BSS    0x20535342   The memory speicfied by the
segment should be zeroed"

And we have code which looks for partial segments backed by file
contents that zeros the memory that the file contents don't cover.

But I don't see anywhere where we actually honor PAYLOAD_SEGMENT_BSS
by zero'ing the memory covered by it.

Is this an oversight or is it explicitly not done, but no reasoning is
documented?

Given the current semantics I think this memory region should be cleared.

-Aaron