[coreboot-gerrit] Change in coreboot[master]: drivers/storage: Add SD/MMC/eMMC support

[Martin Roth (Code Review)]

Martin Roth has posted comments on this change. ( https://review.coreboot.org/19208 )

Change subject: drivers/storage: Add SD/MMC/eMMC support
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Patch Set 4:

This patch follows in the footsteps of two previous patches which have generated significant discussion.
https://review.coreboot.org/#/c/19004 and https://review.coreboot.org/#/c/18105

The 18105 patch spawned a long thread on the mailing list about whether or not the storage driver should even go into coreboot.  The decision from Stefan and the coreboot leadership was that it *SHOULD* go ahead.

Since the final plan is that this driver will be used in a multi-threaded environment to help speed up the boot time, we've requested that the final version have two configuration options to help with debug:
1) The driver should be able to be run in a single-threaded mode as well as the multi-threaded mode.
2) The driver should be able to be disabled to let the system run as it currently does with the storage driver initialization happening solely in the payload.

-- 
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Gerrit-MessageType: comment
Gerrit-Change-Id: I9b5f9db1e27833e4ce4a97ad4f5ef3a46f64f2a2
Gerrit-PatchSet: 4
Gerrit-Project: coreboot
Gerrit-Branch: master
Gerrit-Owner: Lee Leahy <leroy.p.leahy at intel.com>
Gerrit-Reviewer: Aaron Durbin <adurbin at chromium.org>
Gerrit-Reviewer: Martin Roth <martinroth at google.com>
Gerrit-Reviewer: Paul Menzel <paulepanter at users.sourceforge.net>
Gerrit-Reviewer: Stefan Reinauer <reinauer at chromium.org>
Gerrit-Reviewer: build bot (Jenkins)
Gerrit-HasComments: No