[U-Boot] Enabling ARM DCache (and MMU setup) in U-Boot

[Alessandro Rubini]

> I am having exactly the same problem as described here by Drasko. Once I
> enable MMU on ARM920T by setting the cp15 register 1, I get a data abort.

Would you please try my patch? I haven't tried on 920T, but it worked
well on 926.  If needed I can try on 920T, as I have one.

I sent it on Jan 26 2010.  I think it's high time to add the missing
flush and resend it, but it's in the archives anyways (message-id
<20100126161608.GA20946 at morgana.gnudd.com>)

/alessandro