[U-Boot] Ethernet on PandaBoard

[Tom Rini <trini@ti.com>]

On Thu, Jul 12, 2012 at 07:17:59AM -0600, Gary Thomas wrote:
> On 2012-07-12 07:15, Tom Rini wrote:
> >On Thu, Jul 12, 2012 at 07:06:02AM -0600, Gary Thomas wrote:
> >>On 2012-07-12 03:30, Tom Rini wrote:
> >>>On Thu, Jul 12, 2012 at 02:20:18AM -0700, Tom Rini wrote:
> >>>>On Wed, Jul 11, 2012 at 07:08:50AM -0600, Gary Thomas wrote:
> >>>>
> >>>>>I just tried rev 211e47549b668c7cdd8658c0413a272f0d0495d4 (v2012.07-rc1)
> >>>>>for my PandaBoard.  Sadly, this is failing when I try to use the onboard
> >>>>>ethernet (EHCI USB based) controller:
> >>>>
> >>>>Sorry for the late response, at a conference.  This is a known problem
> >>>>and we will either have this fixed soon (Ilya Yanok is working on a
> >>>>series) or we will build-time disable dcache support on these boards and
> >>>>fix this properly for the next release.
> >>>>
> >>>>In short, some cache clean-ups in ehci-hcd.c exposed other cache
> >>>>problems on other platforms where our cache size is 64 not 32bytes.
> >>>
> >>>I take it back, I forgot omap4 is 32byte cache.  With the fix that
> >>>Tetsuyuki Kobayashi pointed you at (oh, and a Tested-by to that thread
> >>>if you can), can you please do a little stress testing of USB, to make
> >>>sure things are otherwise really happy (eth and perhaps a USB stick)?
> >>>Thanks alot!
> >>>
> >>
> >>Yesterday, this was working great.  This morning, when I turned on
> >>the board, it can no longer find anything on the USB bus - nothing at
> >>all.  This also applies to Linux when I boot from SD.  I'm really
> >>confused :-(
> >>
> >>If I boot the board using the 2011.06 U-Boot, all is happy again.
> >>It looks like the USB HUB (USB3320) seems to be stuck in reset when
> >>I use the latest U-Boot.
> >>
> >>Ever hear of any problems like this?
> >
> >How about if you turn the dcache off at run or build time?
> >
> 
> Sorry for being thick, but how do I do that?  I don't see any
> cache manipulation commands in 'help'

Looks like omap4 doesn't have CONFIG_CMD_CACHE set, so indeed you're
missing 'dcache off' as a command.  The other one is to add
CONFIG_SYS_DCACHE_OFF to omap4_panda.h (or omap4_common.h) and rebuild.

-- 
Tom