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I just RMA'ed an xM because it could not reliably read the kernel to
boot from any SD card I have (and I have quite a few brands).
The replacement xM works perfectly with all of the cards that I have tried.
This of course isn't conclusively a hw issue, since the linux driver
timer could possible be marginal, but it does at least raise some
suspicion that there might be some hw issues.
Steve
Can't type this morning! I of course meant:
"since the linux driver timing could possibly be marginal"
Steve
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I believe that there may be an additional issue with the OMAP hsmmc
driver's computation of dto (the data timeout value). I've been able
to make most cards that don't work function with an increase in the
calculated dto value.
There's a thread on the linux-omap list discussing this.
Note that I too believe that 3.15V would be a good idea, I just don't
think that is the only issue.
Steve
Well, I finally received my microSD card extender so I was able to
probe the mmc card this morning.
I turns out that u-boot is using 3.0V for mmc, but the kernel mmc
driver switches to 3.15V.
So we aren't going to get a magical fix from the switch to 3.15V since
we are already there.
I was able to get most cards working with the following patch to the
dto calculation:
However I still have 2 cards which will not work reliably on my OMAP
systems: a SanDisk 4GB Class 4 card and and an ADATA 4GB Class 6 card.
Both cards work properly on my desktop system using a SanDisk USB
dongle, which powers the cards at 3.43 V.
An interesting experiment would be to hack up a board to supply 3.3V
to the card to see whether that fixes the issue. I'm not willing to
sacrifice a board to the cause though :-)
Steve
Actually it might be simpler to use an extender to do the hack, there
is easy access to the signals with one of these:
http://www.hwtools.net/ExtenderBoard/TFEX.html
Sparkfun also sells a simpler equivalent (that's the one I got):
http://www.sparkfun.com/products/9419
Steve
I need to know where the screw mount holes are located. I looked in the users guide, but no diagram has actual hole locations. Can someone point me to a good diagram for this?
thanks,
-andrew
Download the free Allegro viewer from here:
http://www.cadence.com/products/pcb/Pages/downloads.aspx
Then download the Allegro PCB files from here:
http://beagleboard.org/hardware/design
The allegro tool has a nice measurement tool for measuring distances. You could also use the Geber files and a Gerber viewer as well.
Gerald
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2011/1/19 Seppo Nikkilä <seppo....@innovativeideas.fi>:
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Given a choice between two theories, take the one which is funnier
j.
2011/1/20 Seppo Nikkilä <seppo....@innovativeideas.fi>: