>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
Have you tried changing the partition number up or down by one? >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. I tend not to use a configuration across distros, unless I had built the first from a pure kernel source from kernel.org or similar. In fact, most of my kernel configurations are done from scratch, because I have had trouble in the past in areas where the flavor customized the kernel for the sub-version of the distribution. > >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. Try re-partitioning, setting the boot flag, and swap partition type. I prefer cfdisk. >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. As much as I like LFS, it's not great for a production OS. Without distancing yourself from the OS too much, Gentoo automates the tedious end of things, but specific customizations can be applied relatively easily. -- http://linuxfromscratch.org/mailman/listinfo/lfs-support FAQ: http://www.linuxfromscratch.org/lfs/faq.html Unsubscribe: See the above information page
