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List:       linux-omap
Subject:    Re: Tracking N770 breakage
From:       Andrew de Quincey <adq_dvb () lidskialf ! net>
Date:       2009-05-22 22:18:26
Message-ID: 20090522231826.12833dwwkvi7rv0g () lidskialf ! net
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Quoting Andrew de Quincey <adq@lidskialf.net>:

> Quoting Andrew de Quincey <adq_dvb@lidskialf.net>:
>
>> Quoting Tony Lindgren <tony@atomide.com>:
>>
>>> * Andrew de Quincey <adq_dvb@lidskialf.net> [090519 22:15]:
>>>> Quoting Tony Lindgren <tony@atomide.com>:
>>>>
>>>>> * Andrew de Quincey <adq_dvb@lidskialf.net> [090516 19:17]:
>>>>>> Argh, my N770 seems to have just died; it has been behaving slightly
>>>>>> oddly and now it simply won't turn on (black screen and no sign of life
>>>>>> whatsoever).
>>>>>>
>>>>>> It is well out of warranty and frankly I don't see myself buying another
>>>>>> one, so this effectively ends my hacking on it :(
>>>>>
>>>>> Bummer :(
>>>>>
>>>>> After a quick try, CONFIG_OMAP_RESET_CLOCKS was the first stopper, then
>>>>> it could not mount the MMC root.
>>>>
>>>> Ahh excellent, that was why I posted my progress, in case it rang a bell
>>>> with anyone! I think the touchpad driver may be broken as well BTW.
>>>>
>>>>> I think there was a patch posted for the omap1 MMC by Ladislav few months
>>>>> ago that probably fixes it.
>>>>
>>>> Cool - I hope I may be back in the running soon (I was rather annoyed
>>>> when I posted that message!); I've ordered a new battery in case its
>>>> just that. A kind person has also offered me one thats broken in a
>>>> different way that I can probably cobble together with the remains of
>>>> mine if its something more critical that has died.
>>>
>>> Good to hear, let's hope it just needs a new battery.
>>>
>>> See also the n8x0 thread. If we get drivers/cbus to mainline, we
>>> pretty much have everything we need for 770 in mainline too.
>>>
>>> It would be nice to get the drivers/mmc/host/omap.c patch integrated
>>> for 2.6.30 to make omap1 MMC work again. Ladislav, any news on that?
>>
>> OK! My friend has lent me his N770 in the meantime so I can get  
>> going again. It seems the board is fried on mine as my battery  
>> works perfectly fine in his. gah!
>>
>> Anyway, I have just tried disabling RESET_CLOCKS, but it still  
>> doesn't work for me with the very latest linux-omap-2.6.
>>
>> With my HWA patch applied, at least the screen goes black, but I  
>> don't see any console output, and the thing doesn't appear as a USB  
>> gadget (I'm mounting NFS as root over USB with cdc_ether).
>>
>> I wish the thing had an LED I could turn on! Hmm, I wonder if I  
>> could turn off the backlight easily..
>
> Actually, after playing a bit, I discovered I'm getting a boot  
> penguin logo ok, but no actual textual console output; weird!

I feel really silly; the N770's bootloader had "serial-console"  
enabled, which meant all the kernel messages were being sent out that  
instead of being displayed on the fb. So I can now see WTF is going on!

Next problem for me: ohci-hcd.c is reporting an initialisation error  
in the latest kernels, which is why my NFS-over-USB mount fails. I  
can't see any changes in the initialisation *values* used, but there  
have obviously been the "kill OMAP_TAG_USB" changes; I'm wondering if  
its some initialisation ordering problem.

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