[linux-sunxi] Re: [PATCH 4/4] simplefb: add clock handling code

[Luc Verhaegen]

On Tue, Aug 26, 2014 at 09:52:49AM +0200, Thierry Reding wrote:
> On Mon, Aug 25, 2014 at 05:09:00PM +0200, Luc Verhaegen wrote:
> > On Mon, Aug 25, 2014 at 05:05:04PM +0200, Thierry Reding wrote:
> > > 
> > > No. simplefb just wants to write to some memory that hardware has been
> > > set up to scan out. The platform requires that the clocks be on.
> > 
> > Simplefb also requires that the memory is there and is persistent. Fine 
> > for discrete graphics cards, fine for rpi where most things are hidden 
> > from the ARM core anyway, not so fine for anybody else.
> 
> I don't understand. This patch series isn't changing anything about the
> memory aspects of the driver yet it's working for you on sunxi, isn't
> it? So it can't be all that broken.
> 
> Thierry

Oh, i had to go wrestle with UBoot options and reserve 8MB off the top, 
which the kernel never gets told about. A nice throwback to x86 IGP 
bioses, a past i had thought i had left behind forgood.

Luc Verhaegen.