[U-Boot] MMC broken after a7778f8fbee098c78b1fa1e1331313a7e217fb30

Tom Rini trini at ti.com
Mon Mar 5 15:58:16 CET 2012

On 03/04/2012 01:32 PM, Pali Rohár wrote:
> On Sunday 04 March 2012 13:23:44 Tom Rini wrote:
>> On Sun, Mar 4, 2012 at 1:06 PM, Pali Rohár<pali.rohar at gmail.com>  wrote:
>>> Hi,
>>> this commit is breaking MMC support on Nokia N900:
>>> a7778f8fbee098c78b1fa1e1331313a7e217fb30 omap_hsmmc: Wait for CMDI to be
>>> clear
>>> I'm geting only error message "timedout waiting on cmd inhibit to clear"
>>> and I cannot read files from eMMC and SD card. When I reverted commit
>>> that commit I all is OK.
>> OK, we need to debug what the n900 is doing (do you see this in qemu,
>> real HW or both?) since clearing the bit fixes certain SD cards on
>> other boards (beagleboard and gumstix iirc, but it was a generic
>> issue).  Thanks!
> RX-51 build of U-Boot in qemu cannot read mmc. It report error about bad
> voltage. This was problem also before that commit. RX-51 Linux kernel does not
> have any problem with mmc, special prepaired Maemo 5 image (with some SW on
> eMMC) from Nokia working fine in qemu.
> I ignored above problem in qemu, because mmc worked fine on real n900. But
> after that commit mmc does not working on real n900 too.

First, if you change SD cards, does the problem go away?  Second, my 
expectation is that we will make further changes, probably not in time 
for v2012.03, to the omap_hsmmc.c driver to bring it more in-line with 
how the kernel driver works.  Thanks!


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