From 3d90d3bfce7b3e2a885bb4722ecb3a5c127e2882 Mon Sep 17 00:00:00 2001 From: Evgeny Zinoviev Date: Sat, 25 May 2019 17:38:53 +0300 Subject: [PATCH] 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 Reviewed-on: https://review.coreboot.org/c/coreboot/+/32683 Tested-by: build bot (Jenkins) Reviewed-by: Angel Pons --- util/autoport/readme.md | 6 ++++++ 1 file changed, 6 insertions(+) diff --git a/util/autoport/readme.md b/util/autoport/readme.md index cfa8c36a38..fa349b906f 100644 --- a/util/autoport/readme.md +++ b/util/autoport/readme.md @@ -268,6 +268,12 @@ If several slots are soldered there are two ways to handle them: 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