diff options
| author | Ionela Voinescu <ionela.voinescu@imgtec.com> | 2015-03-30 11:59:10 +0100 |
|---|---|---|
| committer | Patrick Georgi <pgeorgi@google.com> | 2015-04-22 08:59:44 +0200 |
| commit | a2c4f9ee9fbedfe540145350b121f5ffb9ce0b67 (patch) | |
| tree | bb7321ba545c5bc5079e68db85a8a25f25043e17 /src/soc/imgtec | |
| parent | d1a21d7d7182a40f06f8ec4ff216454fd3c8c1cc (diff) | |
imgtec/pistachio: DDR row/bank/column mapping
The DRAM configuration register, apart from holding the
device density and width also has a rudimentary address
mapping scheme. Currently this is set to the default
Bank/Row/Column. This means that the memory is segmented
into 8 chunks, each with a page detector. If all the
activity is in one section of memory then the other 7
page detectors could be idle.
Changing this to Row/Bank/Column would concatenate the
page detectors meaning that all 8 could be used by a
single initiator. This may not gain anything in a
synthetic bandwidth test but could yield extra performance
in a real world application or benchmark.
BRANCH=none
BUG=chrome-os-partner:37087
TEST=tested on Pistachio bring up board -> DDR initialized
properly; all access to DDR works properly in
Coreboot ramstage, Depthcharge and Linux;
no performance tests were ran so far.
Change-Id: I22d86bf3b679ed63884d7436d9d7bbaf1726f640
Signed-off-by: Patrick Georgi <pgeorgi@chromium.org>
Original-Commit-Id: e852ed42afcdc2062a0037144bab723227cb1f1f
Original-Change-Id: If90b0cf5ce86db5e3d6d362873d22d4269e3a49f
Original-Signed-off-by: Ionela Voinescu <ionela.voinescu@imgtec.com>
Original-Reviewed-on: https://chromium-review.googlesource.com/264340
Original-Reviewed-by: James Hartley <james.hartley@imgtec.com>
Original-Reviewed-by: David Hendricks <dhendrix@chromium.org>
Reviewed-on: http://review.coreboot.org/9916
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/imgtec')
| -rw-r--r-- | src/soc/imgtec/pistachio/ddr2_init.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/soc/imgtec/pistachio/ddr2_init.c b/src/soc/imgtec/pistachio/ddr2_init.c index ad5cf888d6..66b8778c48 100644 --- a/src/soc/imgtec/pistachio/ddr2_init.c +++ b/src/soc/imgtec/pistachio/ddr2_init.c @@ -510,10 +510,10 @@ int init_ddr2(void) * 5:2 Density 2Gb = 5 * 6 Dram Type (MDDR/LPDDR2) Only 0 * 7 Reserved 0 - * 10:8 Address Map R/B/C = 0 + * 10:8 Address Map R/B/C = 1 * 31:11 Reserved */ - write32(DDR_PCTL + DDR_PCTL_DCFG_OFFSET, 0x00000016); + write32(DDR_PCTL + DDR_PCTL_DCFG_OFFSET, 0x00000116); /* PCFG_0 : Port 0 AXI config */ if (BL8) write32(DDR_PCTL + DDR_PCTL_PCFG0_OFFSET, 0x000800A0); |