OMAP MMC - problem with initing card

OMAP MMC - problem with initing card

[Marek Vašut]

Hi,
I posted this question some time ago, but I made some progress.
Here it is: I´ve been using omap mmc driver (omap.c) on Palm Zire71 since 
2.6.16 at least and it was working perfectly. I was using the mmc card as 
root device. There was no problem with it - I booted linux, mmc got inited, 
printed info about partitions on it (that mmc0: p1 p2) and system normally 
booted from it. This changed by this merge

http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=commit;h=36808520ce2c9ade647d36c80004c158c71d0510

which caused, that the list of partition wasnt displayed anymore and system 
ended up without root device. Like the mmc wasnt present at all. I tested 
latest git and when I used initramfs and (from initramfs environment) issued

mount /dev/mmcblk0p2 /mnt/card
(mount second partition of mmc to /mnt/card)

it made the kernel somehow init the card. So the list of partitions got 
printed (mmc0: p1 p2), but mount crashed and argued that it cant mount that 
partition. So I tried it once again... and voila, partition was mounted 
without problems and was working like before. But the problem still 
persists - I cant boot directly from it without initramfs. Any ideas?

Thanx a lot for anything, any ideas.
Enjoy tomorow ;-)

Best regards
Marek

Re: OMAP MMC - problem with initing card

[Tony Lindgren]

Hi,

* Marek Vašut <marek.vasut@gmail.com> [061223 14:33]:
> Hi,
> I posted this question some time ago, but I made some progress.
> Here it is: I´ve been using omap mmc driver (omap.c) on Palm Zire71 since 
> 2.6.16 at least and it was working perfectly. I was using the mmc card as 
> root device. There was no problem with it - I booted linux, mmc got inited, 
> printed info about partitions on it (that mmc0: p1 p2) and system normally 
> booted from it. This changed by this merge
> 
> http://source.mvista.com/git/gitweb.cgi?p=linux-omap-2.6.git;a=commit;h=36808520ce2c9ade647d36c80004c158c71d0510
> 
> which caused, that the list of partition wasnt displayed anymore and system 
> ended up without root device. Like the mmc wasnt present at all. I tested 
> latest git and when I used initramfs and (from initramfs environment) issued
> 
> mount /dev/mmcblk0p2 /mnt/card
> (mount second partition of mmc to /mnt/card)
> 
> it made the kernel somehow init the card. So the list of partitions got 
> printed (mmc0: p1 p2), but mount crashed and argued that it cant mount that 
> partition. So I tried it once again... and voila, partition was mounted 
> without problems and was working like before. But the problem still 
> persists - I cant boot directly from it without initramfs. Any ideas?
> 
> Thanx a lot for anything, any ideas.
> Enjoy tomorow ;-)

Just a guess, but it sounds like something is not ready with MMC when
compiled in. Maybe try rootdelay=3 or something to try to troubleshoot
it?

Tony