[coreboot-gerrit] Change in coreboot[master]: lib: set up specific purpose memory as LB_MEM_SOFT_RESERVED

[Nico Huber (Code Review)]

Attention is currently required from: Lance Zhao, Marc Jones, Jonathan Zhang, Philipp Deppenwiese, Tim Wawrzynczak, Julius Werner, Angel Pons, Subrata Banik, Patrick Rudolph, Peter Tsung Ho Wu, Ron Minnich.
Nico Huber has posted comments on this change. ( https://review.coreboot.org/c/coreboot/+/52585 )

Change subject: lib: set up specific purpose memory as LB_MEM_SOFT_RESERVED
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Patch Set 4:

(1 comment)

File src/commonlib/include/commonlib/coreboot_tables.h:

https://review.coreboot.org/c/coreboot/+/52585/comment/ee793ac2_5b9ab64b 
PS4, Line 158: #define LB_MEM_SOFT_RESERVED		 0xefffffff /* Special-purpose memory */
> But current lb_memory_range is not same as ACPI memory range address anyway? […]

It's not the same but by default the values are mapped 1:1. If you
don't want to have the same value in coreboot and e820. We could as
well use `7` here (or `17`; I don't know why there is a gap). And
let the code that fills the e820 table handle the mapping.

That's independent of the question if 0xefffffff is the right value
for e820 entries, though. What confuses me the most is that it is
the last value of the undefined range. So it seems unlikely that it
would become the official value later.