> -----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?)
