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From: Ayman El-Khashab <ayman@elkhashab.com>
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Subject: Re: Problems mapping OCM memory from 460EX to user space
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On 7/7/2010 2:48 PM, ayman@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.