tree 1d1f74d771dc2e8e8a67dab985945c00f68e0097
parent 0ecbacbfca7f919f1780f5062c775d94c7869d81
author Nico Huber <nico.h@gmx.de> 1507996048 +0200
committer Nico Huber <nico.h@gmx.de> 1514457857 +0000

spi25: Integrate 4BA support

Allow 4-byte addresses for instructions usually used with 3-byte
addresses. Decide in which way the 4th byte will be communicated
based on the state of the chip (i.e. have we enabled 4BA mode)
and a new feature bit for an extended address register. If we
are not in 4BA mode and no extended address register is available
or the write to it fails, bail out.

We cache the state of 4BA mode and the extended address register
in the flashctx.

Change-Id: I644600beaab9a571b97b67f7516abe571d3460c1
Signed-off-by: Nico Huber <nico.h@gmx.de>
Reviewed-on: https://review.coreboot.org/22384
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>