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authorIonela Voinescu <ionela.voinescu@imgtec.com>2015-03-05 17:25:48 +0000
committerPatrick Georgi <pgeorgi@google.com>2015-04-21 08:26:34 +0200
commit823f6072a7dfa59e3048c2db175e61caabf63cb3 (patch)
tree9be6ba441a1d3942787701473d1067b3de520a10 /src/soc/imgtec/pistachio
parent51ad6ac695c5353d66210b9ed77e420eb9a520ef (diff)
downloadcoreboot-823f6072a7dfa59e3048c2db175e61caabf63cb3.tar.xz
pistachio: Remove 50% DDR bandwidth restriction
The existing DDR setup configures the burst length to be 8. However the DDR controller can only be given sufficient data per clock to satisfy a burst length of 4, hence the bursts are only half populated. This results in a 50% drop of efficiency. Fix this by configuring the burst size to 4. 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: I761ba73a04688841ca39a370b7cb99b6e0b22964 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 0e590ab8387dbbccef45dc84d1eeafee2abc9e2e Original-Change-Id: I585385b65e330624ad70292349e50c6695eeeb6c Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com> Original-Reviewed-on: https://chromium-review.googlesource.com/256305 Original-Reviewed-by: David Hendricks <dhendrix@chromium.org> Reviewed-on: http://review.coreboot.org/9847 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/imgtec/pistachio')
-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 0943cfa74c..ad5cf888d6 100644
--- a/src/soc/imgtec/pistachio/ddr2_init.c
+++ b/src/soc/imgtec/pistachio/ddr2_init.c
@@ -119,7 +119,7 @@
#define DDRPHY_BISTUDPR_OFFSET (0x0120)
#define DDRPHY_DLLGCR_OFFSET (0x0010)
-#define BL8 1
+#define BL8 0
#define DDR_TIMEOUT_VALUE_US 100000