Lots of memory on 826x

[Rune Torgersen]

> -----Original Message-----
> From: Kumar Gala [mailto:kumar.gala at freescale.com] 
> Sent: Tuesday, March 08, 2005 17:14
> To: Rune Torgersen
> Cc: linuxppc-embedded at ozlabs.org; Matt Porter
> Subject: Re: Lots of memory on 826x
> 
> Hmm, I think there is an expectation that virt->phys is a simple 
> translation (ie, subtract KERNELBASE) for lowmem.  lowmem most parts 
> tops out at 768M.  So changing VMALLOC_START would break that.

Yep noticed..... (tried changing it...)

> 
> Is there an issue with moving the IMMR virt address up higher?
Not really. Will have to redo a whole lot of address maps for some
external devices, but not too bad...

I did change the kernel start address, and that seems to work better,
except that things is still broken when CONFIG_HIGHMEM is set
When that option is set, it maps the highmem to 0xFE000000, which is in
the IO area mapped for IMMR and other memory mapped devices.
(0xF0000000-0xFFFFFFFF)

This can be changed by CONFIG_HIGHMEM_START. Any good ideas on where to
move it to?

(Maybe change IMMR/IO to 0xF8000000 and up, and set HIGHMEM_START to
0xF0000000?)