Hi, I am facing a strange problem with a PCI express device. I have written a simple PCI driver(pci_skel sample driver for LDD book) just to detect a PCI device and read its vender and device id from its configuration space. When I connect the device on a standard i386 based PC, it works fine, as expected. But when I run the same driver on the MPC837xERDB board(powerpc arch based processor from freescale), it gives me error. Below is the O/P on both the architectures. Could anyone suggest what can be the cause of this problem? I am new to linux device driver development.
i386 output. [ 921.097050] PCI driver: Init function [ 921.097415] PCI driver: Probe function [ 921.097442] pci_skel 0000:04:00.0: PCI INT A -> GSI 18 (level, low) -> IRQ 18 [ 921.097453] PCI driver Vendor ID = 1204 [ 921.097462] PCI driver Device ID = e250 [ 921.097471] PCI driver Revision = 0 Powerpc output PCI driver: Init function PCI driver: Probe function pci_skel 0001:02:00.0: device not available (can't reserve [mem 0x00000000-0x0003ffff]) Unable to Enable PCI device:-22 pci_skel: probe of 0001:02:00.0 failed with error -22 Thanks in advance Ravi Gupta
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