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| author | Stefan Roese <sr@denx.de> | 2008-01-05 09:12:41 +0100 |
|---|---|---|
| committer | Stefan Roese <sr@denx.de> | 2008-01-05 09:12:41 +0100 |
| commit | 845c6c95dbfe6c915ce68a0a115852fa17932fb4 (patch) | |
| tree | b935ef67e63cae739a497daf7e70869653c1b2cb /include/configs/katmai.h | |
| parent | 5c740711f0ea5b51414b341b71597c4a0751be74 (diff) | |
| download | talos-obmc-uboot-845c6c95dbfe6c915ce68a0a115852fa17932fb4.tar.gz talos-obmc-uboot-845c6c95dbfe6c915ce68a0a115852fa17932fb4.zip | |
ppc4xx: Update Katmai/44x_spd_ddr2.c code for optimal DDR2 setup
On Katmai the complete auto-calibration somehow doesn't seem to
produce the best results, meaning optimal values for RQFD/RFFD.
This was discovered by GDA using a high bandwidth scope,
analyzing the DDR2 signals. GDA provided a fixed value for RQFD,
so now on Katmai "only" RFFD is auto-calibrated.
This patch also adds RDCC calibration as mentioned on page 7 of
the AMCC PowerPC440SP/SPe DDR2 application note:
"DDR1/DDR2 Initialization Sequence and Dynamic Tuning"
Signed-off-by: Stefan Roese <sr@denx.de>
Diffstat (limited to 'include/configs/katmai.h')
| -rw-r--r-- | include/configs/katmai.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/configs/katmai.h b/include/configs/katmai.h index 0aa4f2dcc0..78c794a05d 100644 --- a/include/configs/katmai.h +++ b/include/configs/katmai.h @@ -111,6 +111,7 @@ #define CONFIG_SPD_EEPROM 1 /* Use SPD EEPROM for setup */ #define SPD_EEPROM_ADDRESS {0x51, 0x52} /* SPD i2c spd addresses*/ #define CONFIG_DDR_ECC 1 /* with ECC support */ +#define CONFIG_DDR_RQDC_FIXED 0x80000038 /* optimal value found by GDA*/ #undef CONFIG_STRESS /*----------------------------------------------------------------------- |
