From 10af6d53bcf068b91c1b6ce6aa0fad5d89b36f81 Mon Sep 17 00:00:00 2001
From: Wolfgang Denk <wd@fifi.denx.de>
Date: Fri, 16 Jun 2006 16:53:06 +0200
Subject: [PATCH] Fix DDR6 errata on TQM834x boards Patch by Thomas Waehner, 07
Mar 2006
---
CHANGELOG | 3 +++
board/tqm834x/tqm834x.c | 24 ++++++++++++++++++++++++
2 files changed, 27 insertions(+)
diff --git a/CHANGELOG b/CHANGELOG
index cfa774175b0..c1fc890d493 100644
--- a/CHANGELOG
+++ b/CHANGELOG
@@ -2,6 +2,9 @@
Changes since U-Boot 1.1.4:
======================================================================
+* Fix DDR6 errata on TQM834x boards
+ Patch by Thomas Waehner, 07 Mar 2006
+
* Remove obsolete flash driver board/tqm5200/flash.c
Patch by Martin Krause, 11 Jan 2006
diff --git a/board/tqm834x/tqm834x.c b/board/tqm834x/tqm834x.c
index b5c12e3e240..d992aec3817 100644
--- a/board/tqm834x/tqm834x.c
+++ b/board/tqm834x/tqm834x.c
@@ -406,4 +406,28 @@ static void set_ddr_config(void) {
(DDR_REFINT_166MHZ_7US << SDRAM_INTERVAL_REFINT_SHIFT) |
(DDR_BSTOPRE << SDRAM_INTERVAL_BSTOPRE_SHIFT);
SYNC;
+
+ /* Workaround for DDR6 Erratum
+ * see MPC8349E Device Errata Rev.8, 2/2006
+ * This workaround influences the MPC internal "input enables"
+ * dependent on CAS latency and MPC revision. According to errata
+ * sheet the internal reserved registers for this workaround are
+ * not available from revision 2.0 and up.
+ */
+
+ /* Get REVID from register SPRIDR. Skip workaround if rev >= 2.0
+ * (0x200)
+ */
+ if ((im->sysconf.spridr & SPRIDR_REVID) < 0x200) {
+
+ /* There is a internal reserved register at IMMRBAR+0x2F00
+ * which has to be written with a certain value defined by
+ * errata sheet.
+ */
+#if defined(DDR_CASLAT_20)
+ *((u8 *)im + 0x2f00) = 0x201c0000;
+#else
+ *((u8 *)im + 0x2f00) = 0x202c0000;
+#endif
+ }
}
--
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