From 51ad6ac695c5353d66210b9ed77e420eb9a520ef Mon Sep 17 00:00:00 2001 From: Ionela Voinescu Date: Thu, 5 Mar 2015 17:11:14 +0000 Subject: [PATCH] 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 Original-Commit-Id: ac081ac59c0dc3d16a7b540cd379fb870b6cfe40 Original-Change-Id: If7951812033c4e88f4be3c143fb49526eddba142 Original-Signed-off-by: Ionela Voinescu Original-Reviewed-on: https://chromium-review.googlesource.com/256304 Original-Reviewed-by: David Hendricks Reviewed-on: http://review.coreboot.org/9846 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer --- src/soc/imgtec/pistachio/ddr2_init.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) 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