mb/google/cyan: fix RAM training on edgar variant

Adapted from Chromium commit 5351dc0d
[Edgar: To set the RX ODT limit and dram geometry with RAMID detection]

Several cyan variants require memory init parameters be passed to FSP 
for handling of specific Micron modules; without these, RAM init will
fail when loading training data from the MRC cache, and boot will halt.
This was missed when I upstreamed edgar along with the other cyan
variants, so add the required memory init parameters for edgar as per
its source Chromium branch.

Test: build/boot on edgar board with affected Micron memory 
modules, verify boot successful with populated MRC cache.

Change-Id: I6a2bc30b54ff1a17c854a90dfcb2308d27ee2be7
Signed-off-by: Matt DeVillier <matt.devillier@gmail.com>
Reviewed-on: https://review.coreboot.org/c/31615
Reviewed-by: Nico Huber <nico.h@gmx.de>
Reviewed-by: Paul Menzel <paulepanter@users.sourceforge.net>
Reviewed-by: Angel Pons <th3fanbus@gmail.com>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>

2 files changed, 48 insertions, 0 deletions

diff --git a/src/mainboard/google/cyan/variants/edgar/Makefile.inc b/src/mainboard/google/cyan/variants/edgar/Makefile.inc
index 2e8b02c64e..ad9ac8a422 100644
--- a/src/mainboard/google/cyan/variants/edgar/Makefile.inc
+++ b/src/mainboard/google/cyan/variants/edgar/Makefile.inc
@@ -14,6 +14,7 @@
 ## GNU General Public License for more details.
 ##
 
+romstage-y += romstage.c
 romstage-y += spd_util.c
 
 ramstage-y += gpio.c
diff --git a/src/mainboard/google/cyan/variants/edgar/romstage.c b/src/mainboard/google/cyan/variants/edgar/romstage.c
new file mode 100644
index 0000000000..12fef77394
--- /dev/null
+++ b/src/mainboard/google/cyan/variants/edgar/romstage.c
@@ -0,0 +1,47 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright (C) 2013 Google Inc.
+ * Copyright (C) 2015 Intel Corp.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ */
+
+#include <soc/romstage.h>
+#include <baseboard/variants.h>
+#include <mainboard/google/cyan/spd/spd_util.h>
+
+void variant_memory_init_params(MEMORY_INIT_UPD *memory_params)
+{
+	int ram_id = get_ramid();
+
+	/*
+	 *  RAMID = 5 - 4GiB Micron MT52L256M32D1PF-107
+	 *  RAMID = 7 - 2GiB Micron MT52L256M32D1PF-107
+	 */
+	if (ram_id == 5 || ram_id == 7) {
+
+		/*
+		 * For new micron part, it requires read/receive
+		 * enable training before sending cmds to get MR8.
+		 * To override dram geometry settings as below:
+		 *
+		 * PcdDramWidth = x32
+		 * PcdDramDensity = 8Gb
+		 * PcdDualRankDram = disable
+		 */
+		memory_params->PcdRxOdtLimitChannel0 = 1;
+		memory_params->PcdRxOdtLimitChannel1 = 1;
+		memory_params->PcdDisableAutoDetectDram = 1;
+		memory_params->PcdDramWidth = 2;
+		memory_params->PcdDramDensity = 3;
+		memory_params->PcdDualRankDram = 0;
+	}
+}