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util/apcb: Strip SPD manufacturer information

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Strip manufacturer information from SPDs before injecting into APCB.
This allows more flexibility around changing DRAM modules in the future.

BUG=b:162098961
TEST=Boot, dump memory info

Signed-off-by: Rob Barnes <robbarnes@google.com>
Change-Id: I1bbc81a858f381f62dbd38bb57b3df0e6707d647
Reviewed-on: https://review.coreboot.org/c/coreboot/+/43832
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Reviewed-by: Furquan Shaikh <furquan@google.com>
This commit is contained in:
Rob Barnes
2020-07-27 09:27:31 -06:00
committed by Patrick Georgi
parent 7884c22f1f
commit ce036bd176
2 changed files with 13 additions and 0 deletions
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11
util/apcb/apcb_edit.py
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@ -58,6 +58,10 @@ def parseargs():
'--hex',
action='store_true',
help='SPD input file is hex encoded, binary otherwise')
parser.add_argument(
'--strip_manufacturer_information',
action='store_true',
help='Strip all manufacturer information from SPD')
parser.add_argument(
'--board_id_gpio0',
type=int,
@ -155,6 +159,13 @@ def main():
assert len(spd) == 512, \
"Expected SPD to be 512 bytes, got %d" % len(spd)
if args.strip_manufacturer_information:
print("Stripping manufacturer information from SPD")
spd = spd[0:320] + b'\x00'*64 + spd[320+64:]
assert len(spd) == 512, \
"Error while stripping SPD manufacurer information"
print("Enabling channel %d, dimm %d and injecting SPD" %
(spd_ssp.ChannelNumber, spd_ssp.DimmNumber))
spd_ssp = spd_ssp._replace(SpdValid=True, DimmPresent=True)