Patrick Georgi has submitted this change and it was merged. ( https://review.coreboot.org/c/coreboot/+/32683 )
Change subject: util/autoport: Add info about rank 1 mirroring ......................................................................
util/autoport: Add info about rank 1 mirroring
inteltool can't detect whether address mapping is normal or mirrored, which in turn may be cause RAM initialization to fail when using spd.bin generated by inteltool.
Mention this in readme as it may help someone.
Change-Id: I8d24e4d9332bdcf484987581dd6941e2bf9c4f87 Signed-off-by: Evgeny Zinoviev me@ch1p.io Reviewed-on: https://review.coreboot.org/c/coreboot/+/32683 Tested-by: build bot (Jenkins) no-reply@coreboot.org Reviewed-by: Angel Pons th3fanbus@gmail.com --- M util/autoport/readme.md 1 file changed, 6 insertions(+), 0 deletions(-)
Approvals: build bot (Jenkins): Verified Angel Pons: Looks good to me, approved
diff --git a/util/autoport/readme.md b/util/autoport/readme.md index cfa8c36..fa349b9 100644 --- a/util/autoport/readme.md +++ b/util/autoport/readme.md @@ -268,6 +268,12 @@ not forget to copy the data on all the array elements that need it. * If they use different data, use several files.
+If memory initialization is not working, in particular write training (timB) +on DIMM's second rank fails, try enbling rank 1 mirroring, which can't be +detected by inteltool. It is described by SPD field "Address Mapping from Edge +Connector to DRAM", byte `63` (`0x3f`). Bit 0 describes Rank 1 Mapping, +0 = standard, 1 = mirrored; set it to 1. Bits 1-7 are reserved. + ### `board_info.txt`
`board_info.txt` is a text file used in the board status page to list all