[En-Nut-Discussion] olimex-sam7-ex256 mmc problem

[Andreas Wickström]

Hi Rob
I have no problem reading the card in my pc so I know that the card works
fine.
I tried to format the card again and now the MBR has moved from the
beginning of the card to an offset around 0x10000 in the card.
Will the PHAT filesystem take care of that or what will happened?
I also wounder is there any way to check if the read partition part is ok?
I think that my problem lies there some whare. I will investigate that more
later in the week.

/Andreas

-----Original Message-----
From: en-nut-discussion-bounces at egnite.de
[mailto:en-nut-discussion-bounces at egnite.de] On Behalf Of PragmaLab
Sent: den 2 maj 2008 22:31
To: en-nut-discussion at egnite.de
Subject: Re: [En-Nut-Discussion] olimex-sam7-ex256 mmc problem

Hello Andreas,

> Hi
> I have now tried the httpd example with no luck.
> The card I use is a 1 GB card SD card from TEKQ. Is there any 
> differens in using a mmc card or using a sd card so maybe 
> that is my problem?
> When I debug the code I get the MBR right I think. I get the 
> MSDOS5.0 in the beginning and the 0x55 and 0xAA in the end. 

As far as I know there is no difference between a MMC and SD card as long as
you use it in SPI-mode. If you can read the MBR without any problem, a lot
of things already are OK (at least this excludes timing-issues and low level
block acces is also working). Only thing I can think of for now is that you
are using a SD-HC card (that will result in reading the MBR correct, but
fails when trying to locate the FAT-tables). On the other hand, you say you
have a 1 GB card, which is not HC. I suppose the card is working without
problems in a PC-reader or other SD-ready device....?

Regards,

Rob van Lieshout

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