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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 /README | |
| parent | 5c740711f0ea5b51414b341b71597c4a0751be74 (diff) | |
| download | u-boot-imx-845c6c95dbfe6c915ce68a0a115852fa17932fb4.zip u-boot-imx-845c6c95dbfe6c915ce68a0a115852fa17932fb4.tar.gz u-boot-imx-845c6c95dbfe6c915ce68a0a115852fa17932fb4.tar.bz2 | |
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 'README')
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