[U-Boot] multichannel mmc strangeness on omap

[Tom Rini]

On Mon, Jul 30, 2012 at 06:36:24AM -0700, Steve Sakoman wrote:
> Does anyone have any experience enabling the second or third mmc
> channels in u-boot on an omap3 board?
> 
> I used the feature successfully a couple of years ago on Overo, but of
> course there have been many changes in the mmc code since then.
> 
> Here's what I tried for overo with the current head of tree:
> 
> diff --git a/board/overo/overo.c b/board/overo/overo.c
> index f973870..51315b3 100644
> --- a/board/overo/overo.c
> +++ b/board/overo/overo.c
> @@ -404,6 +404,7 @@ int board_eth_init(bd_t *bis)
>  int board_mmc_init(bd_t *bis)
>  {
>  	omap_mmc_init(0, 0, 0);
> +	omap_mmc_init(2, 0, 0);
>  	return 0;
>  }
>  #endif
> 
> The result is a hang after printing: MMC: OMAP SD/MMC 0,  SD/MMC 1
> 
> After adding a few printf's, it seems that the crash/hang is occurring
> when calling env_relocate_spec in env_nand.c, which of course is
> completely unrelated code!

I've spent some time scratching my head against a hang in the same spot,
on am335x.  I only have seen it when booting from NAND (same image from
MMC or UART is fine).  Further, it only showed up when a change was made
in another driver which isn't even entered before the hang.

-- 
Tom