When selecting whether to boot linux from a USB drive, CDROM, or SATA drive it looks like I have to take 2 (or more) routes:

1. Learn how to create an Initrd image and incorporate it into my GRUB configuration

2. Learn how to boot with ISOLINUX

Before I jump into those guides which seem as big as the LFS guide, can anyone tell me if there is any simple solution?

I've booted my LFS (or should I say GRUB only) on a USB drive and it generates an error when mounting "root=" claiming my USB drive /dev/sdb1 couldn't be found. I get a list of "available" partitions which are all of the /dev/sda* persuasion, and thus, the local computer drive (which I do not want to set as root)

I guess it's not as simple as setting root=/dev/sdb1 or somehow inserting a script to mount /dev/sdb1 before that line is called?

hi

there may be more than one solution such as compiling a kernel with usb BUILTIN instead of modules, but I am wondering if you understood that when you built your usb system....you were likely to have booted from hard drive so sdb for usb was reasonable.

When you change boot order to usb....it should be sda1....try it and see what happens

2) usb devices also need time to settle....does LFS have a boot code like TC which is waitusb=number

---------- Post added 23-08-11 at 20:16 ----------

hi

there may be more than one solution such as compiling a kernel with usb BUILTIN instead of modules, but I am wondering if you understood that when you built your usb system....you were likely to have booted from hard drive so sdb for usb was reasonable.

When you change boot order to usb....it should be sda1....try it and see what happens

2) usb devices also need time to settle....does LFS have a boot code like TC which is waitusb=number

1 members found this post helpful.

Instead of giving device descriptors, like /dev/sdb1, to the root option I would try it with labels or UUIDs.

I'll give this a shot soon and post results. Thanks for the suggestions

No luck, I'm going to try using the grub instructions from this link:

http://www.gnu.org/software/grub/man...ble-CD_002dROM

Basically, make a grub rescue disk but include my entire LFS system onto the rescue USB disk.

hi

that might make a bootable image but it won't have your filesystem unless you populate it more ok?

so

I am assuming you are using grub-legacy? or does LFS now use grub2


after creating the folder iso....use ROOT powers to populate all folders of underneath so eg you could use a file manager to navigate to

iso/etc/fstab

if you don't use root powers you won't copy across your root only files

Following the GRUB instructions I run the grub-mkrescue and get: genisoimage: command not found

So finding that genisoimage is in a package called cdrkit, I try to get cdrkit. I've only found it in RPM format.

BLFS guide (current) recommends using a rpm2targz converter, I ran into some dependency problems and other such things so I took up trying to install RPM on a fresh LFS 6.3 install in order to install the cdrkit for GRUB.

I'm going to start a separate thread for RPM installing.