[PATCH] ARM: Implement cpu_v7_reset.

[u.kleine-koenig@pengutronix.de (Uwe Kleine-König)]

Hello,

> > +#ifdef CONFIG_MMU
> > +	mcr     p15, 0, ip, c8, c7, 0           @ invalidate I & D TLBs
> > +#endif
> > +	mrc     p15, 0, ip, c1, c0, 0           @ ctrl register
> > +	bic     ip, ip, #0x000f                 @ ............wcam
> > +	bic     ip, ip, #0x1100                 @ ...i...s........
> > +	mcr     p15, 0, ip, c1, c0, 0           @ ctrl register
> 
> On a related note, I was always a bit confused since proc-v6 and proc-v7
> don't turn off the MMU in their cpu_reset functions, which doesn't seem
> correct with respect to Documentation/arm/Booting. Is it necessary to
> turn off the MMU when kexec'ing the kernel? Last time I tried kexec'ing
> on a v6 it worked fine without turning off the MMU.
The boot process isn't that strict.  Having the MMU off is the safest,
but e.g. having an 1:1 mapping worked OK last time I checked.  But this
has to be considered to be by chance and it might not work with 2.6.37.

Best regards
Uwe

-- 
Pengutronix e.K.                           | Uwe Kleine-K?nig            |
Industrial Linux Solutions                 | http://www.pengutronix.de/  |