Problems mapping OCM memory from 460EX to user space
ayman at elkhashab.com
Sun Jul 11 14:14:18 EST 2010
On 7/7/2010 2:48 PM, ayman at austin.rr.com wrote:
> rc = io_remap_pfn_range(vma, PLB_OCM_BASE_ADDR>>PAGE_SHIFT, vma->vm_start, len, vma->vm_page_prot);
> I am fairly certain the physical address is correct, I've verified that the
> TLB entries in u-boot look ok. Any tips on how to make this work?
I found / fixed the issue. The first problem is that start and offset
are swapped in the io_remap_pfn_range invocation. The 2nd was that
there were some TLB changes that were needed to map the OCM.
More information about the Linuxppc-dev