Posts Tagged ‘build linux kernel’
Kernel Panic…VFS:Unable to mount root fs on unknown block…
Recently I was trying to install a linux kernel on a Compaq N800W. After I built the kernel I would always get the error kernel panic error. I found my answer on page 59 in here.
The full book is here.
I feel the main problem was that “ata_piix” was built as a plugin module instead of being built into the kernel. When I explicitly required “ata_piix” in the config file, then the kernel panic went away.
From the book but I want this as quick reference.
How to find out the Disk Controller:
$ tree -d /sys/block | egrep “hd|sd”
$ ls -l /sys/block/sda
…
device -> /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0
…
$ ls -l /sys/devices/pci0000:00/0000:00:1f.2/host0/target0:0:0/0:0:0:0
…
device -> ../../../../../../bus/scsi/drivers/sd
Notice here that the SCSI disk controller is responsible for making this device work.
Continuing up …
