[Macchiato] SD problems

[Ard Biesheuvel]

> On 14 Jun 2017, at 21:51, Marcin Wojtas <mw at semihalf.com> wrote:
> 
> 
> 
> 2017-06-14 21:50 GMT+02:00 Ard Biesheuvel <ard.biesheuvel at linaro.org>:
>> 
>> 
>>> On 14 Jun 2017, at 21:49, Marcin Wojtas <mw at semihalf.com> wrote:
>>> 
>>> 
>>> 
>>> 2017-06-14 20:19 GMT+02:00 Ard Biesheuvel <ard.biesheuvel at linaro.org>:
>>>> On 14 June 2017 at 20:09, Marcin Wojtas <mw at semihalf.com> wrote:
>>>> > Hi Steve,
>>>> >
>>>> > I tried two different SD cards, both worked, so maybe I was lucky. Anyway,
>>>> > are you sure, you have MBR partition table + the first (boot) partition
>>>> > starts at 4096?
>>>> >
>>>> 
>>>> I can confirm it is a board level issue: I had the pleasure of playing
>>>> with Steve's board as well as my own, and as he reported, one of my
>>>> working SDs also worked on his board. My experience is not as bad, but
>>>> out of my sizable collection, only two uSD cards are accepted by the
>>>> bootrom.
>>>> 
>>> 
>>> Who knows, maybe it's somehow related to unstable SD card operation in UEFI? 7040/8040-DB do not have such problems with this interface (and same cards).
>>> 
>> 
>> But we are talking about boot from SD, long before uefi is even involved.
> 
> I know, but if the bootrom has problems with some cards, why UEFI couldn't?
>  

Ah, I see. Yes, those could be related, indeed.

I seriously wonder whether the layout of this board was validated for high speed signal integrity


>> 
>>> Anyway, please boot via UART, following this instruction:
>>> https://wiki.solid-run.com/doku.php?id=products:a8040:software:development:u-boot_atf
>>> We found it today, and it really eases the whole process. I'll take it to main McBin wiki.
>>> 
>>> Please let know if it worked for you.
>>> 
>>> Best regards,
>>> Marcin
>>> 
>> 
>> Thanks
>> 
>>>  
>>>> 
>>>> > 2017-06-14 18:49 GMT+02:00 Steve McIntyre <steve at einval.com>:
>>>> >>
>>>> >> Hey guys,
>>>> >>
>>>> >> I'm sstill stumped here with getting my Macchiato to boot off SD. I've
>>>> >> tried lots of different cards and can't find anything that will
>>>> >> work. The *only* card that I've seen work is the unlabelled/unknown
>>>> >> card that Ard brought with him to Cambridge last month. Nothing else
>>>> >> even comes close to booting on my board, which makes it really
>>>> >> difficult to get much further with doing anything on my machine.
>>>> >>
>>>> >> If it wasn't for this *one* SD card working fine first time, I'd be
>>>> >> tempted to say my machine had a hardware fault. I've tried multiple
>>>> >> Sandisk cards from 1GB up to 64GB, Samsung 32G, Toshiba 32G, Kingston
>>>> >> 8G and up, Intenso 4G. I'm waiting on another Kingston 4G card to land
>>>> >> tomorrow, to try that too. It's very frustrating. :-(
>>>> >>
>>>> >> I'm assuming failure logs are not interesting. I can supply them if
>>>> >> desired - just ask.
>>>> >
>>>> >
>>>> > Yes, please show the logs.
>>>> >
>>>> > Best regards,
>>>> > Marcin
>>>> >
>>>> >>
>>>> >>
>>>> >> In the meantime, I can see that there's a fallback option to boot via
>>>> >> UART. Is there any documentation about what's needed to use that
>>>> >> anywhere?
>>>> >>
>>>> >> --
>>>> >> Steve McIntyre, Cambridge, UK.
>>>> >> steve at einval.com
>>>> >>   Armed with "Valor": "Centurion" represents quality of Discipline,
>>>> >>   Honor, Integrity and Loyalty. Now you don't have to be a Caesar to
>>>> >>   concord the digital world while feeling safe and proud.
>>>> >>
>>>> >>
>>>> >> _______________________________________________
>>>> >> Macchiato mailing list
>>>> >> Macchiato at lists.einval.com
>>>> >> https://lists.einval.com/cgi-bin/mailman/listinfo/macchiato
>>>> >
>>>> >
>>>> >
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>>> 
> 
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