Re: dtb for pandaboard

[Tony Lindgren <tony@atomide.com>]

* Dennis Gilmore <dennis@ausil.us> [120713 06:13]:
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> On Thu, 12 Jul 2012 23:57:00 -0700
> Tony Lindgren <tony@atomide.com> wrote:
> 
> > * Dennis Gilmore <dennis@ausil.us> [120711 06:53]:
> > > On Wed, 11 Jul 2012 00:42:33 -0700
> > > Tony Lindgren <tony@atomide.com> wrote:
> > > > 
> > > > Sounds like it's some kind of issue with dtb getting overwritten
> > > > by something. We had an issue where kernel BSS was overlapping dtb
> > > > in some cases, but those should be fixed.
> > > 
> > > seems that they are not all fixed appending the dtb allows me to
> > > boot i could try loading the dtb at a different address. 
> > 
> > OK sounds like that's the issue then, hopefully moving the dtb around
> > helps.
> 
> moving the address for the dtb does result in it starting to boot

Great. Can you please post the kernel, dtb and initrd addresses for
what worked and what did not work?

I'd like to know where the overwriting happens: Already in u-boot,
while uncompressing kernel, or while kernel resets BSS.
 
> > > > Maybe try to leave out ARCH_OMAP2 and ARCH_OMAP3 and maybe
> > > > CONFIG_NET from your .config to make the kernel smaller and see
> > > > if that makes a difference?
> > > > 
> > > > If that works, then moving the dtb address in uEnv.txt should
> > > > help.
> > > > 
> > > > Also, please check if the same issue happens with appended dtb:
> > > with the appended dtb image im back to where i was not using a dtb
> > > file at all.  that is that omap is not being autoloaded. and the
> > > sdcard so rootfs never shows up.  i get dropped to a dracut rescue
> > > shell where if i manually modprobe omap  nothing is happening. 
> > 
> > If the SD card is not detected with appended dtb either, the card
> > voltages may not be supported. I believe Rajendra mentioned in some
> > mail that we're still missing some voltage settings for the DT case
> > for omap_hsmmc.c. In that case the card should work for the non-DT
> > booting though.
> 
> I started trying to use a dtb because the sdcard was not showing up. I
> wanted to see if using dtb allowed it to work. it doesnt work with or
> without a dtb.

Hmm maybe grep for the MMC errors during the boot without dtb and also
post some info on the MMC card?

Regards,

Tony