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====== ROM Dumping ====== Sometimes it can be useful to dump PCI expansion ROMs for debugging and troubleshooting purposes. This page shows how to extract PCI expansion ROM contents. ===== ROM Dumping on Linux ===== Sysfs provides access to all PCI devices on a system ([[http://lxr.linux.no/linux/Documentation/filesystems/sysfs-pci.txt|sysfs-pci.txt documentation]]). It is possible to map in expansion ROMs in order to dump their contents. First select the PCI device you want to dump the ROM from: # lspci -nn # this lists PCI devices and their bus IDs 00:00.0 Host bridge [0600]: Intel Corporation Mobile 915GM/PM/GMS/910GML Express Processor to DRAM Controller [8086:2590] (rev 04) 00:02.0 VGA compatible controller [0300]: Intel Corporation Mobile 915GM/GMS/910GML Express Graphics Controller [8086:2592] (rev 04) [...] Enable the expansion ROM for the device: # cd /sys/bus/pci/devices/0000\:00\:02.0 # the VGA controller from above # echo 1 >rom Dump the ROM contents: # cp rom /tmp/rom_dump Disable the expansion ROM for the device: # echo 0 >rom
