Seems my mailer broke the patch, so I'm sending it as attachement.

Ilya A. Volynets-Evenbakh wrote:

> Ilya A. Volynets-Evenbakh wrote:
>
>> Hi all,
>>
>> Here is patch to allow IP32 to access full 1G of memory.
>> I was able to boot an O2 with 576M of ram using NFS-root.
>>
>> Two notes:
>> 1. This patch will only work with latest linux-mips.org CVS tree
>> 2.  Seems that PCI support is messed up by this patch, so SCSI 
>> doesn't work.
>>
>> If someone can see something obvious regarding #2, I'll be glad to 
>> hear it.
>>
>>    Ilya.
>>
> So, I found the problem.
> Memory above 256M is mapped at 0x40000000+256M in IP32. However, PCI 
> sees whole 1G as contiguous chunk at
> offset 0. This means we have to translate dma addreses differently, 
> depending on wether they fall within first
> 256M or not.
>
> So, I created separate implemetation of pci_dma_* routines.
>