[U-Boot] [PATCH] mpc83xx: Make it boot again

[Scott Wood]

On Fri, 12 Nov 2010 09:58:53 -0600
Kumar Gala <galak at kernel.crashing.org> wrote:

> 
> On Nov 4, 2010, at 11:47 AM, Wood Scott-B07421 wrote:
> 
> > Joakim Tjernlund wrote:
> >> Trial and error suggests that map_flash_by_law1 needs
> >> an isync(padding with 4 nop's also did the trick)
> >> after updating LBLAWAR1 to make sure the the change has
> >> reached the HW before continuing with the code that depends on it.
> >> Add an isync to remap_flash_by_law0 for good measure too.
> > 
> > To be totally safe, we probably want to do a readback plus twi (to turn a data dependency into a flow dependency) before the isync.
> 
> We only do the 'twi' for loads/in_beX not stores/out_beX.

Yes, and the readback is a load.

-Scott