Re: driver for the mvme5100

On Fri, Sep 14, 2001 at 10:01:54AM +0200, Xavier Grave wrote:

in the driver there is two code lines :
pci_read_config_dword(carte.pci,PCI_BASE_ADDRESS_0,&tmp);
carte.bus_delta = carte.pci->resource[0].start - tmp;
on the mvme2303 it gives 0xc000 0000 which is the prep offset.
on the mvme5100 it gives 0. Since the mvme5100 is chrp-like I wait
for a 0x4000000 value or something different from zero ?

Does anybody have an idea ?

That's what you should expect to see.  In Linux a PCI mem resource
is defined as an ioremapable token.  It may or may not be a PCI or
processor bus address.  In the case of a PReP memory map, PCI bus
addresses are translated in a non-1:1 fashion.  So an offset of
0xc0000000 is correct for the difference between the actual BAR
value and the corresponding Linux resource value.  In the case
of a CHRP memory map, PCI bus addresses are 1:1 with processor
bus addresses (like most developers like to assume..x86).  In
this case the mem resource start will be the same as the actual
memory BAR value.

--
Matt Porter
MontaVista Software, Inc.
mporter@mvista.com

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