RE: [PATCH] Disable the non working eMMC on Zoom2/3

["Madhusudhan" <madhu.cr@ti.com>]

> -----Original Message-----
> From: Tony Lindgren [mailto:tony@atomide.com]
> Sent: Wednesday, April 28, 2010 2:23 PM
> To: Madhusudhan
> Cc: 'Nishanth Menon'; 'Ghorai, Sukumar'; linux-omap@vger.kernel.org;
> linux-mmc@vger.kernel.org
> Subject: Re: [PATCH] Disable the non working eMMC on Zoom2/3
> 
> * Tony Lindgren <tony@atomide.com> [100427 11:16]:
> > * Madhusudhan <madhu.cr@ti.com> [100408 10:07]:
> > > > >
> > > > > Tony, do you care to just look up the serial number of your board?
> > > >
> > > > Sorry for the delay in replying, I've been travelling for a few
> weeks
> > > > and been in meetings quite a bit. Anyways, it's a 1013037 REV A
> board,
> > > > which seems to be production in the table above.
> > > >
> > >
> > > That means we can not assume all production units have a working eMMC.
> > > Would you mind sharing your bootup log? When this device is detected
> > > something like below is a clear issue.
> > >
> > > mmcblk1: mmc1:0001 STM16G 1.00 GiB
> > > mmcblk1: p1 p2
> 
> For the eMMC I seem to have that:
> 
> [    0.978363] mmc1: new high speed MMC card at address 0001
> [    0.984344] mmcblk1: mmc1:0001 STM16G 1.00 GiB
> [    0.989105]  mmcblk1: unknown partition table
> ...
> 
> zoom:~# fdisk -l /dev/mmcblk1
> [  120.306396] mmcblk1: retrying using single block read
> [  120.503692] mmcblk1: retrying using single block read
> [  120.683593] mmcblk1: error -110 transferring data, sector 2097144, nr
> 8, card status 0x900
> [  120.691894] end_request: I/O error, dev mmcblk1, sector 2097144
> [  120.872680] mmcblk1: error -110 transferring data, sector 2097145, nr
> 7, card status 0x900
> ...
> 
> > Hmm, finally got around looking into this again. Looks like the mmc
> > is now working on my zoom3 with the current Linus' tree at commit
> > 7c6bd2010fced38444c9fd658f4c6ce61bd185bf. So I guess something that
> > we had in omap-fixes fixed this. Or maybe some fix for drivers/mmc?
> >
> > This is with the debug_ll patch applied:
> >
> > https://patchwork.kernel.org/patch/87532/
> 
> For the microSD card, turns out the card I used was flakey. So
> that should explain some of the problems. I'm almost certain
> I tried with two different cards earlier though. In any case,
> let's assume the problem is only the eMMC.
> 
Sorry, I did not get a complete picture. Your earlier email said that with
Linus tree eMMC on your Zoom3 is working. Is that correct?

IMHO, an omap level fix can not solve the problem with eMMC because as I can
see from the log you provided above that a 16G device is detected as 1G.
This is certainly due to the issue I mentioned earlier. 

Regards,
Madhu

> Regards,
> 
> Tony