On  29 Jul, this message from Benjamin Herrenschmidt echoed through cyberspace:

On Wed, Jul 28, 1999, Michel Lanners [off-list ref] wrote:

quoted

It seems that OpenFirmware is not doing its job well in initializing all
PCI devices.For the planb driver, which uses an onboard PCI device
(video input) known to OF (i.e Apple device), I need to set
PCI_COMMAND_MEMORY | PCI_COMMAND_MASTER | PCI_COMMAND_INVALIDATE. Or is
it just a problem with IO space enabling, and memory is already
switched on by OF?

OF will not enable memory space if there's no OF boot code on the board.
I beleive it doesn the same with IO space (but I didn't check). The lack
of PCI_COMMAND_INVALIDATE can be considered as an OF bug if the card
already has PCI_COMMAND_MASTER set as a default. I think the kernel
should add this to all devices at fixup time. (It should be harmless for
non-master devices anyway).

Right, according to 'Designing PCI cards and Drivers..', OF never
enables neither memory space, nor IO space, neither ROM. It should,
however, set both PCI_COMMAND_MASTER and PCI_COMMAND_INVALIDATE. I
didn't chek, though...

I'm getting a patch ready that fixes this on the PMac plkatform. Geert,
how about OF in your CHRP box? Does it need the enable fix as well?

Michel

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