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authorIonela Voinescu <ionela.voinescu@imgtec.com>2015-03-05 17:11:14 +0000
committerPatrick Georgi <pgeorgi@google.com>2015-04-21 08:26:20 +0200
commit51ad6ac695c5353d66210b9ed77e420eb9a520ef (patch)
tree731450bd35bde74eeb6341343be386732711f8a3 /src
parent59074ff89fee709a3822d50a400834b70dd87b23 (diff)
pistachio: Decrease DDR ODT from 75R to 50R
The DDR On Die Termination was incorrectly configured at 75R, where as the data sheet suggests for DDR2-800 it should be set to 50R. Correct this by adjusting the ODT setting in the EMR register. BUG=chrome-os-partner:31438, chrome-os-partner:37087 TEST=tested on Pistachio bring up board -> DDR initialized properly and ramstage executed correctly BRANCH=none Change-Id: I2f0242c422b1cb3d1f64ce3dd17b62fef5e7e155 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: ac081ac59c0dc3d16a7b540cd379fb870b6cfe40 Original-Change-Id: If7951812033c4e88f4be3c143fb49526eddba142 Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com> Original-Reviewed-on: https://chromium-review.googlesource.com/256304 Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/9846 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src')
-rw-r--r--src/soc/imgtec/pistachio/ddr2_init.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/src/soc/imgtec/pistachio/ddr2_init.c b/src/soc/imgtec/pistachio/ddr2_init.c
index e236c1c5e5..0943cfa74c 100644
--- a/src/soc/imgtec/pistachio/ddr2_init.c
+++ b/src/soc/imgtec/pistachio/ddr2_init.c
@@ -240,7 +240,7 @@ int init_ddr2(void)
* 15:13 RSVD
* 31:16 Reserved
*/
- write32(DDR_PHY + DDRPHY_EMR_OFFSET, 0x00000004);
+ write32(DDR_PHY + DDRPHY_EMR_OFFSET, 0x00000044);
/* MR2 : EMR2 Register
* Generate to use with PHY and PCTL
* 2:0 PASR, NA 000