site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Thread-index: Acb8uU1A2SXVTRaQSTSQghcisf6a8ABLmb/R Thread-topic: pci-probe-mask This is off topic for the Darwin list but anyway... What you have to do is examine how pci-probe-mask is used in the probe-slots method of /pci There is a pci-probe-history value that keeps track of which slots were probed. On a fully populated B&W G3, this would be 0x0001005F (bit positions 0,1,2,3,4,6,0x10). probe-slots of /pci calls probe-slots of /pci/pci-bridge (" /pci/@d") with pci-probe-request which is pci-probe-mask minus pci-probe-history. probe-slots of /pci/pci-bridge then calls a method 6 times with values 0,1,2,3,4,6. That method probes the slot depending on the mask. When probe-slots of /pci/pci-bridge returns, probe-slots of /pci calls a method with a value of 0x10. On my B&W G3, I have devices: ff85ec58: /pci@80000000 ff85faf0: /pci-bridge@d ff860a58: /mac-io@5 ff873730: /firewire@0 ff8739f8: /pci-ata@1 ff877ff0: /usb@2 ff87bdc0: /pci17fc,1688@2,3 ff87c078: /pci104c,8025@3 ff87c320: /ACARD,6280M@4 ff887c00: /usb@6 ff88bd08: /ATY,BugsyParent@10 I'm guessing that for each bit, the slots are: 0: built-in firewire 1: built-in ata 2: built-in usb 3: 33 MHz 64 bit PCI slot 4: 33 MHz 64 bit PCI slot 6: 33 MHz 64 bit PCI slot 0x10: 66 MHz 32 bit PCI slot

---------- From: Rakesh Singhal Sent: Monday, October 30, 2006 10:53 PM

I'm using a G3 machine with the following configuration:

Machine Name: PowerMacG3series Machine Model: PowerMac1,1 CPU Type: PowerPC 750 (2.2) Number Of CPUs: 1 CPU Speed: 350 MHz L2 Cache (per CPU): 1 MB Memory: 256 MB Bus Speed: 100 MHz Boot ROM Version: 1.1.1f4

I need to disable probing of pci slots to test my firmware code. I know pci-probe-mask is the NVRAM variable where I need to mask the bit for a particular PCI slot. But I haven't found any document so far describing the bit significance of pci-probe-mask. With trial and error I could find the masking bit for a G4 machine but for G3 this mask is not working.

Can anyone tell me how do achieve what I'm looking for.

Thanks

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