From mboxrd@z Thu Jan 1 00:00:00 1970 From: Gary Thomas Date: Thu, 12 Jul 2012 10:44:49 -0600 Subject: [U-Boot] Ethernet on PandaBoard In-Reply-To: <20120712161654.GE7993@oliver-linux> References: <4FFD7AE2.8000109@mlbassoc.com> <20120712092018.GA5464@oliver-linux> <20120712093036.GB5464@oliver-linux> <4FFECBBA.9030308@mlbassoc.com> <20120712131501.GC7993@oliver-linux> <4FFECE87.7070301@mlbassoc.com> <20120712132055.GD7993@oliver-linux> <4FFED0DD.10203@mlbassoc.com> <4FFEDEAF.1060406@mlbassoc.com> <20120712161654.GE7993@oliver-linux> Message-ID: <4FFEFF01.1050806@mlbassoc.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: u-boot@lists.denx.de On 2012-07-12 10:16, Tom Rini wrote: > On Thu, Jul 12, 2012 at 08:26:55AM -0600, Gary Thomas wrote: >> On 2012-07-12 07:27, Gary Thomas wrote: >>> On 2012-07-12 07:20, Tom Rini wrote: >>>> 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. >>>> >>> >>> No difference, sorry. >>> >> >> After some poking around, I found that the GPIO pins used by the USB >> (GPIO_1 = hub power, GPIO_62 = hub reset) were not muxed at all. This >> left those signals (and many others) in strange limbo. >> >> Adding CONFIG_SYS_ENABLE_PADS_ALL brought it back to life and the network >> is working once more. > > OK. Can you confirm if f3f98bb0b8cc520e08ea2bdfc3f9cbe4e4ac29f5 is what > breaks / unbreaks things? The USB pins are supposed to all be set > (1a89a217f5c5ab3645c80c1247e8911a8b5ad491) but perhaps some got missed. > Correct. Reverting f3f98bb0b8cc520e08ea2bdfc3f9cbe4e4ac29f5 solves the problem in general. That's what I discovered on my own. Without CONFIG_SYS_ENABLE_PADS_ALL, the changes in 1a89a217f5c5ab3645c80c1247e8911a8b5ad491 leave out platform specific pins, in particular the GPIO pins used by the USB HUB. Perhaps they should be defined in a different section? I am loathe to experiment much with this as the board is 6000 miles away. If I mess up something, the network breaks and the only way to fix it is to take out the SD card and reprogram it on a PC - something I can only do with on-site help and they've all gone home for the night :-) If you need me to work this more, it'll have to wait until tomorrow. -- ------------------------------------------------------------ Gary Thomas | Consulting for the MLB Associates | Embedded world ------------------------------------------------------------