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Re: Are PCI bridges automatically configured?



Hi Peter,

"Joel Sherrill " wrote:

>
>
> > I changed the hardwired number of busses from 2 to BusCountPCI() in the
> > mvme5500 pcifinddevice.c, and now I am seeing the PCI bus on the other
> > side of the DEC 21150 bridge:
> >
> > cexp_main>BSP_pciFindDevice(0x16d5,0x4d4d,0,pbus,pdev,pfun)
> > BSP_pciFindDevice: found 0x643011AB at 0/0/0
> > BSP_pciFindDevice: found 0x643011AB at 0/0/1
> > BSP_pciFindDevice: found 0x643011AB at 0/0/2
> > BSP_pciFindDevice: found 0x643011AB at 0/0/3
> > BSP_pciFindDevice: found 0x643011AB at 0/0/4
> > BSP_pciFindDevice: found 0x643011AB at 0/0/5
> > BSP_pciFindDevice: found 0x643011AB at 0/0/6
> > BSP_pciFindDevice: found 0x643011AB at 0/0/7
> > BSP_pciFindDevice: found 0x445716D5 at 0/6/0
> > BSP_pciFindDevice: found 0x00263388 at 0/10/0
> > BSP_pciFindDevice: found 0x000010E3 at 1/0/0
> > BSP_pciFindDevice: found 0x00221011 at 1/4/0
> > BSP_pciFindDevice: found 0x4D4D16D5 at 2/2/0
> > 0x00000000 (0)
> > cexp_main>
> >
> > so that last entry is my Acromag PMC341 card.
>  >
> > So now I guess I follow what I see in the libchip/network drivers for
> > setting things up using "pci_write_config_foo"?  I don't need any DEC
> > 21150 specific code anywhere?
>
> I can't guarantee that but is is quite likely.

What  I see in the 4.7 tree I have downloaded from three months ago,
the dec21140.c support DEC21140.   Perhaps you know the difference
between DEC21140 and DEC21150 ?

>
>
>  > Do the "pci_write_config_word" calls
> > allocate resources?
>
> No.  They just hide the procedure used to access the configuration space
> on the PCI bus.  It knows where it is mapped in local memory, proper
> endianness, special timing, etc.
>
> > Any "heads up" appreciated, I'm just getting started on this part.
>
> Converting the pci calls in the BSP to use the regular pci_ ones and
> specify the bus number would go a long way to helping. :)

Since I am back from my vacation, I will put this on my next thing
to do.

Regards,
Kate