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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 /board/amcc | |
| parent | 5c740711f0ea5b51414b341b71597c4a0751be74 (diff) | |
| download | blackbird-obmc-uboot-845c6c95dbfe6c915ce68a0a115852fa17932fb4.tar.gz blackbird-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 'board/amcc')
| -rw-r--r-- | board/amcc/katmai/katmai.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/board/amcc/katmai/katmai.c b/board/amcc/katmai/katmai.c index 25c9a22fea..e41caaf344 100644 --- a/board/amcc/katmai/katmai.c +++ b/board/amcc/katmai/katmai.c @@ -1,5 +1,5 @@ /* - * (C) Copyright 2007 + * (C) Copyright 2007-2008 * Stefan Roese, DENX Software Engineering, sr@denx.de. * * See file CREDITS for list of people who contributed to this @@ -246,6 +246,18 @@ int checkboard (void) return 0; } +/* + * Override the default functions in cpu/ppc4xx/44x_spd_ddr2.c with + * board specific values. + */ +u32 ddr_wrdtr(u32 default_val) { + return (SDRAM_WRDTR_LLWP_1_CYC | SDRAM_WRDTR_WTR_180_DEG_ADV | 0x823); +} + +u32 ddr_clktr(u32 default_val) { + return (SDRAM_CLKTR_CLKP_90_DEG_ADV); +} + #if defined(CFG_DRAM_TEST) int testdram (void) { |
