Author: alex Date: 2007-11-29 02:23:08 +0100 (Thu, 29 Nov 2007) New Revision: 532
Modified: LinuxBIOSv3/device/pci_rom.c Log: The attached patch adds code to checksum the pci extension rom and warn if the stored and calculated checksum differ.
There is no easy way to check extension ROMs in the current machine for correct signatures, but you could copy out the memory between 0xc0000 - 0xf00000 from /dev/mem and search for extension headers in it (see the code in pci_rom.c).
Signed-off-by: Alex Beregszaszi alex@rtfs.hu Acked-by: Stefan Reinauer stepan@coresystems.de Acked-by: Carl-Daniel Hailfinger c-d.hailfinger.devel.2006@gmx.net
Modified: LinuxBIOSv3/device/pci_rom.c =================================================================== --- LinuxBIOSv3/device/pci_rom.c 2007-11-28 22:51:31 UTC (rev 531) +++ LinuxBIOSv3/device/pci_rom.c 2007-11-29 01:23:08 UTC (rev 532) @@ -33,6 +33,8 @@ unsigned long rom_address; struct rom_header *rom_header; struct pci_data *rom_data; + unsigned int i; + unsigned char sum = 0, *rom_bytes;
if (dev->on_mainboard) { /* In case some device PCI_ROM_ADDRESS can not be set @@ -67,7 +69,15 @@ le32_to_cpu(rom_header->signature)); return NULL; } + + /* checksum */ + rom_bytes = (unsigned char *)rom_address; + for (i = 0; i < rom_header->size * 512; i++) + sum += *(rom_bytes + i);
+ if (sum != 0) + printk(BIOS_ALERT, "Incorrent Expansion ROM checksum (%02x != 0)\n", sum); + rom_data = (struct pci_data *)((unsigned char *)rom_header + le32_to_cpu(rom_header->data));