MMC init failed

[abhilash h]

Hi All,
I am facing a very peculiar issue. I am using 3.8.13-bone81 with busybox RFS.
Everything is working fine. But if i connect Bi-Directional Logic Level Converter to some gpio's the system freezes.
Below is the serial logs.It would be great if someone could help me out.

U-Boot SPL 2017.01-rc1-00065-g53e8ca2 (Dec 14 2016 - 14:59:19)
Trying to boot from MMC2Card did not respond to voltage select!
*** Warning - MMC init failed, using default environment

** Partition 1 not valid on device 1 **
spl_register_fat_device: fat register err - -1
spl_load_image_fat: error reading image u-boot.img, err - -1
Card did not respond to voltage select!
*** Warning - MMC init failed, using default environment

spl: no partition table found
SPL: failed to boot from all boot devices
### ERROR ### Please RESET the board ###

[Dennis Lee Bieber]

On Fri, 5 May 2017 00:48:51 -0700 (PDT), abhilash h
<abhit...@gmail.com> declaimed the
following:

>Hi All,
>I am facing a very peculiar issue. I am using 3.8.13-bone81 with busybox
>RFS.
>Everything is working fine. But if i connect Bi-Directional Logic Level
>Converter to some gpio's the system freezes.

WHICH GPIO pins?

http://beagleboard.org/Support/bone101/#headers

Any pin starting with MMC1_ should not be used without turning off the
on-board eMMC (meaning you need to boot from an SD card -- and also pinmux
the MMC1_ pins to some other mode)

--
Wulfraed Dennis Lee Bieber AF6VN
wlf...@ix.netcom.com HTTP://wlfraed.home.netcom.com/

[abhilash h]

Hi,

Gpio50, gpio50, gpio 31. The problem is if i disconnect the logic level its working fine. I am using 3.3 to 5 v bi directional logic level .

--
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[Robert Nelson]

On Fri, May 5, 2017 at 9:06 AM, abhilash h <abhit...@gmail.com> wrote:
> Hi,
> Gpio50, gpio50, gpio 31. The problem is if i disconnect the logic level its
> working fine. I am using 3.3 to 5 v bi directional logic level .

That should make it obvious to NOT use those pins, as they are read by
the bootrom on power up.

Take a look at the SRM there's a whole section dedicated to those
pin's with the limitation listed.

Regards,

--
Robert Nelson
https://rcn-ee.com/

[Dennis Lee Bieber]

On Fri, 5 May 2017 09:10:45 -0500, Robert Nelson
<robert...@gmail.com> declaimed the
following:

>
>Take a look at the SRM there's a whole section dedicated to those
>pin's with the limitation listed.
>

It isn't obvious...

Best I've found is table 6 (page 63) which uses the names gpmc_can1,
gpmc_can2 (I think, the PDF is blurry), gpmc_ad0.._ad3 -- and then table 13
(page 86) where one can match gpmc_a2 (NOT _ad2 as on table 6) to P9 pin
14. One has to look elsewhere to find that P9 pin 14 is also known as
GPIO_50 (http://beagleboard.org/Support/bone101/#headers)

[abhilash h]

Thanks robert and dennis  its working now . I changed my design. 

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