From 845c6c95dbfe6c915ce68a0a115852fa17932fb4 Mon Sep 17 00:00:00 2001 From: Stefan Roese Date: Sat, 5 Jan 2008 09:12:41 +0100 Subject: 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 --- include/configs/katmai.h | 1 + 1 file changed, 1 insertion(+) (limited to 'include/configs') 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 /*----------------------------------------------------------------------- -- cgit v1.2.1