Messages in this thread |  | | | From | Zehetbauer Thomas <> | | Subject | Cannot access PCI device | | Date | Thu, 12 Jul 2001 12:42:32 +0200 |
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Hi! I am trying to access a custom PCI device on a Walnut Rev. D system running Hard Hat Linux Rev. 1.2 with Montavista kernel snapshot 01.04.12. The following code is beeing executed in the probe function of a kernel module and works well on Linux 2.4.2/Intel but returns useless values on PowerPC.
### begin code ### unsigned long linux_addr_start, linux_addr_end, val; u32 config_addr;
pdev = pci_find_device(0x10ee, 0x4030, pdev); if (NULL == pdev) return(-1); if (pci_enable_device(pdev)) return(-1); linux_addr_start = pci_resource_start(pdev, 0); linux_addr_end = pci_resource_end(pdev, 0); pci_read_config_dword(pdev, PCI_BASE_ADDRESS_0, &config_addr); printk("Found %s\n", pdev->name); printk("pci_resource_start=%lx\n", linux_addr_start); printk("pci_resource_end=%lx\n", linux_addr_end); printk("PCI_BASE_ADDRESS_0=%lx\n", config_addr); IOAddress = ioremap(config_addr, 0xffff); if (IOAddress) { val = readl(IOAddress + 0xb000); printk("read %lx at remapped PCI_BASE_ADDRESS_0\n", val); iounmap(IOAddress); } IOAddress = ioremap(linux_addr_start, 0xffff); if (IOAddress) { val = readl(IOAddress + 0xb000); printk("read %lx at remapped pci_resource_start\n", val); iounmap(IOAddress); } ### end code ### ### begin i686 result ### Found PCI device 10ee:4030 (Xilinx, Inc.) pci_resource_start=e2000000 pci_resource_end=e200ffff PCI_BASE_ADDRESS_0=e2000000 read fffffff0 at remapped PCI_BASE_ADDRESS_0 read fffffff0 at remapped pci_resource_start ### end i686 result ### ### begin ppc result ### Found PCI device 10ee:4030 (Xilinx, Inc.) pci_resource_start=10000000 pci_resource_end=0 PCI_BASE_ADDRESS_0=ffff0000 read 0 at remapped PCI_BASE_ADDRESS_0 Machine Check: PLB0 bear= 0x1000b000 acr= 0x00000000 besr= 0x0c000000 Machine Check: PLB0 to OPB bear= 0x80401000 besr0= 0x00000000 besr1= 0x00000000 Data Machine Check in kernel mode. Oops: machine check, sig: 7 NIP: C3004160 XER: 20000000 LR: C3004148 SP: C1E69DA0 REGS: c1e69cf0 TRAP: 0200 MSR: 00009230 EE: 1 PR: 0 FP: 0 ME: 1 IR/DR: 11 TASK = c1e68000[30] 'insmod' Last syscall: 128 last math 00000000 last altivec 00000000 GPR00: C3011000 C1E69DA0 C1E68000 C3006000 00000000 00000F45 00000015 C013E000 GPR08: 00000C30 C3016000 C3006000 C02F3000 C013EC30 1001F130 100ABCB0 00000000 GPR16: 100A4C50 10010000 7FFFDF98 00000000 00009230 01E69E80 C1E69DE8 C1ECB2E0 GPR24: 00000008 C1E69E4C 10022B38 0000004C FFFFFFEA 00000000 10000000 C3000000 Call backtrace: C3004148 C30044E8 C0013B98 C00026B4 10010000 10003360 100039F4 0FF055B8 00000000 Bus error ### end ppc result ### Any hints/suggestions?
Regards Tom - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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