On Thu, Oct 17, 2013 at 04:35:38PM +0530, SRICHARAN R wrote: > The change from 0x64656465 to 0x64646464 is to remove the weak pull > enabled on DQS, nDQS lines. This pulls the differential signals in the > same direction which is not intended. So disabling the weak pulls improves > signal integrity. > > On the uEVM there are 4 DDR3 devices. The VREF for 2 of the devices is > powered by > the OMAP's VREF_CA_OUT pins. The VREF on the other 2 devices is powered by > the OMAP's > VREF_DQ_OUT pins. So the net effect here is that only half of the DDR3 > devices were being > supplied a VREF! This was clearly a mistake. The second change improves the > robustness of > the interface and was specifically seen to cure corruption observed at high > temperatures > on some boards. > > With the above two changes better memory stability was observed with extended > temperature ranges around 100C. > > Signed-off-by: Sricharan R <r.sricha...@ti.com>
Applied to u-boot-ti/master, thanks! -- Tom
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