[coreboot-gerrit] Patch merged into coreboot/master: arch/x86: introduce postcar stage/phase
gerrit at coreboot.org
gerrit at coreboot.org
Wed Mar 23 14:24:33 CET 2016
the following patch was just integrated into master:
commit 7f8afe063139f6fc7076a3e4edf6093a953792dc
Author: Aaron Durbin <adurbin at chromium.org>
Date: Fri Mar 18 12:21:23 2016 -0500
arch/x86: introduce postcar stage/phase
Certain chipsets don't have a memory-mapped boot media
so their code execution for stages prior to DRAM initialization
is backed by SRAM or cache-as-ram. The postcar stage/phase
handles the cache-as-ram situation where in order to tear down
cache-as-ram one needs to be executing out of a backing
store that isn't transient. By current definition, cache-as-ram
is volatile and tearing it down leads to its contents disappearing.
Therefore provide a shim layer, postcar, that's loaded into
memory and executed which does 2 things:
1. Tears down cache-as-ram with a chipset helper function.
2. Loads and runs ramstage.
Because those 2 things are executed out of ram there's no issue
of the code's backing store while executing the code that
tears down cache-as-ram. The current implementation makes no
assumption regarding cacheability of the DRAM itself. If the
chipset code wishes to cache DRAM for loading of the postcar
stage/phase then it's also up to the chipset to handle any
coherency issues pertaining to cache-as-ram destruction.
Change-Id: Ia58efdadd0b48f20cfe7de2f49ab462306c3a19b
Signed-off-by: Aaron Durbin <adurbin at chromium.org>
Reviewed-on: https://review.coreboot.org/14140
Tested-by: build bot (Jenkins)
Reviewed-by: Patrick Georgi <pgeorgi at google.com>
Reviewed-by: Furquan Shaikh <furquan at google.com>
See https://review.coreboot.org/14140 for details.
-gerrit
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