[U-Boot] Possible Denx m28evk ethernet problem + solution
Marek Vasut
marek.vasut at gmail.com
Sun Jan 8 11:51:30 CET 2012
> > Please use Stefano's imx git tree, which has support for mx28evk already.
>
> Thanks for the heads-up. It's a bit confusing and unexpected to have a
> mainline spread across different git trees; Will Stefano's mainline be
> integrated into the main-mainline sometime?
Not really ... that's how it all works. When Stefano sends pull RQ, it'll go
mainline.
>
> > m28evk and mx28evk differ in the way they driver their Ethernet PHYs.
>
> Yes, Marek has patiently explained that to me; It's all clear now. But it
> was a good exercise because our product board has a different phy too.
>
> > Let me know if you have any issues.
>
> I have a question: The auto-detected SDRAM size is parsed form SPL to
> U-Boot through both scrathch1 and scratch2, probably as a safeguard not to
> assume any value to be a valid one. Did you ever see the error or
> different scratch values occur? I never did. But what I do see occur every
> now and then is a value of 0 in both registers, mostly after obscure reset
> scenarios.
I see no problems with the board DRAM detection on our board, no. I tested this
quite thoroughly.
I don't see the registers differ either ... ever. I suspect your problem is with
your DRAM configuration data -- if your DRAM chip is misconfigured, you'll get
such memory problems.
>
> Can we agree on a different algo to determine the validity of SDRAM size?
> I'm thinking somewhere around the line of a power of 2 between 2MiB and
> 1GiB. Preferable I'd like to use only 1 scratch register for that. The
> other scratch register could then be used to store the boot-mode value
> during SPL stage. The boot mode value is useful for boards capable of
> booting from different MMC devices, like ours.
RFC/patch is always welcome.
>
> BTW: My version has both MMCs, both Ethernet intefaces and NAND working for
> the evk.
MX28EVK has no NAND if I understand it correctly.
> I have also typed in regs-digctl.h. I can send you or Stefano my
> files, if they're any use to you.
Make a patch and submit to the mailing list, like everyone else does please.
Don't try to reinvent wheel ... square one this time even.
>
> Cheers,
>
> Robert.
M
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