[PATCH] ARM: Versatile Express: Add default memory layout

[linux@arm.linux.org.uk (Russell King - ARM Linux)]

On Thu, Jul 22, 2010 at 11:54:29AM +0100, Catalin Marinas wrote:
> On Thu, 2010-07-22 at 11:30 +0100, Russell King - ARM Linux wrote:
> > On Wed, Jul 21, 2010 at 05:55:09PM +0100, Catalin Marinas wrote:
> > > Since this platform is known to have 1GB of RAM at 0x60000000, add a
> > > .fixup function to set the defaults in case no "mem=" option is passed
> > > on the kernel command line.
> > 
> > And the reason why uboot can't pass the RAM information to the kernel
> > is...
> 
> It needs implementing, or ask the user to pass it on the kernel command
> line. For the latter, I think it would be nicer if the kernel has some
> sane defaults.

The kernel does have some sane _safe_ defaults - it assumes that there's
at least 16M of RAM.

> But anyway I'm proposing this patch for similarities to mach-realview.

I don't think that's a good enough justification.  We have the fixup for
realview because of the dual RAM mappings in physical space, and the
boot loader doesn't know which one we're using.  That problem is unique
to the Realview platforms, and doesn't exist on any of the other ARM
development platforms.