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e41b196977
PCI config read fails should return all 1 bits. All unused registers in an existing PCI device should return 0. Because that's what my Power Mac 8600 returns when I run my Open Firmware lspci command. Any bus/device/function that doesn't exist returns FF and won't be listed by lspci. Any registers that are unused will show as 00 in the lspci output. Make grackle log bus:device.function @register.size in all cases.