4-bit SD Card mode

[Krassimir Slavchev]

Look at this thread:

http://lists.freebsd.org/pipermail/freebsd-arm/2007-March/000458.html

I have made some attempts to enable 4-bit mode but always it seems to 
read wrong data from the card.

Björn König wrote:
> I wrote:
>
>   
>> There are issues with AT91RM9200, but now I think the problem is
>>  something else than I assumed.
>>     
>
> The boot process hangs in kern/vfs_mount:root_mount_prepare() during
> g_waitidle(). Probably a timing issue? This occurs in 4-bit mode only.
>
> Björn
>
>
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