I am building LFS from book 6.4 on an ext3 logical partition of an external USB harddisk. My host system is SUSE 10.3 on one of my two internal harddisks.
Booting from the USB disk fails with "[4.410067] Kernel panic - not syncing: VFS: Unable to mount root fs on unknown-block (2,0)" In the lines right before the panic the kernel seems to enumerate the partitions on my internal harddisks: "[......] 0801 number sdxy" where x=a or b, in y I recognize the partitionnumbers on my two internal harddisks and "number" correlates with the size of the partitions. So it looks as though the panic has something to do with the USB-disk, which is next in line for enumeration. The fstab-entry for the USB-disk is: /dev/disk/by-id/usb-SAMSUNG_HM160HI_160000113662-0:0-part8 /mnt/lfs ext3 defaults 1 1 lspci -v showed as USB-drivers on my host system: USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB UHCI Controller and USB Controller: Intel Corporation 82801EB/ER (ICH5/ICH5R) USB2 EHCI Controller. On that basis I build every reasonable USB- and SCSI-configuration entries into the kernel as well as all of the ext2 and ext3 filesystem-entries, but nothing worked. I have a SUSE 10.3-installation on a primary partition of the same USB-disk and that boots fine. But from the SUSE kerel-configuration I have not been able to figure out the relevant difference with the LFS-kernel-configuration. In the support-archives are some posts with comparable problems, for instance Charles Turner in April (but I could not find his solution) and RaptorX in August (but that was not about an USB-harddisk). Baho Uto gave an excellent exposition to the problem of Rodolfo Perez, but I work the other way round. I tried his solution and copied my LSF-instance from the USB- to my second harddisk, build the kernel there and changed fstab, but Grub protested: "Bad file or directory type". I have not had the time yet to figure out what went wrong there. It took me a long time with LFS to come as far as this (and I enjoyed it very much and learned a lot from it), so I hope somebody can help me with the last hurdle. -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
