Re: range of resource of PCI memory for PowerPC

[Michael <macallan%netbsd.org@localhost>]

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Hello,

On Dec 14, 2008, at 1:33 PM, KIYOHARA Takashi wrote:

> I know, bebox and prep (and ibmnws?) has resource problem of PCI  
> memory.
> We extent memory region at start 0x00000000.  However
> xf86PciBusAccWindowsFromOS() add to resource-list at 0x80000000.

That's the Xserver trying to play operating system and configure PCI  
devices. This list is largely bogus anyway - just set your entries to  
something big enough to cover any PCI memory or IO address legal on  
your hardware.
The start at 0x80000000 is more or less macppc-specific - all host  
bridges Apple ever used in PowerPC boxes have a rimilar address space  
layout - the lower 2GB for RAM and the upper 2GB for PCI space,  
firmware and various hardware registers. They even did that on the G5  
( with more RAM above 4GB ). Many IBM and Motorola hostbridges use a  
very similar layout ( in fact Apple used Motorola's MPC106 and IBM's  
CPC9x5 host bridges in some Macs, either can be found in prep or ofppc  
machines as well )

> Shall we define PCI_MAGIC_MEM_RANGE_{START,END} in param.h, just like
> PCI_MAGIC_IO_RANGE?

I don't see a need for that as long as you can  
mmap(some_pci_bus_address) via ttyE0 you should be fine.

have fun
Michael

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