Grub2 on usb stick

drimades · 10-14-2012, 03:15 AM

Quote:

Originally Posted by spiky0011

Hi

Can you get a grub prompt, If so try loading manually

I can enter the grub prompt and I can see that it recognizes the usb as (hd1,gpt1) (?)
and when I try root(hd1,gpt1) it gives me error: unknown command root(hd1,gpt1)

spiky0011 · 10-14-2012, 03:22 AM

The gpt I have not seen normally it would be msdos1 etc root=(hd1,msdos1)
All mine show like this, Although they are usb harddrives but I dont think there should be a difference

drimades · 10-14-2012, 03:29 AM

I am up to

Code:

linux /boot/vmlinuz root=/

and the possibilities it gives are: bin/ lib/ dev/, but not dev/sd...

drimades · 10-14-2012, 03:30 AM

Quote:

Originally Posted by spiky0011

The gpt I have not seen normally it would be msdos1 etc root=(hd1,msdos1)
All mine show like this, Although they are usb harddrives but I dont think there should be a difference

I think that's because I created the partition with GParted.

spiky0011 · 10-14-2012, 03:34 AM

No i used gparted as well. So at grub prompt if you type ls it returns
hd0,xxx

drimades · 10-14-2012, 03:36 AM

I've got ..., (hd0,msdos2), (hd0,msdos1) ... (hd1,gpt1)

spiky0011 · 10-14-2012, 03:47 AM

Hi

I found this https://wiki.archlinux.org/index.php...c_instructions
Not sure how you get round it though

spiky0011 · 10-14-2012, 04:01 AM

It dosn't look easy to convert drive to mbr from gpt.
http://www.rodsbooks.com/gdisk/mbr2gpt.html
Here might help
http://www.ehow.com/how_12119053_con...mbr-linux.html

drimades · 10-14-2012, 04:59 AM

I changed the partition table and now I have a normal ext3 partition in my usb stick.
the strange things now is that when I install grub with grub-install /dev/sdb1 it says Installation finished. No errors reported, but the grub folder in /mnt/lfs/boot/ is empty?!

spiky0011 · 10-14-2012, 05:05 AM

Should it be /dev/sdb not /dev/sdb1

colorpurple21859 · 10-14-2012, 08:18 AM

On first boot with grub2 installed to usb key, grub2 will see the usb key as the first hard drive, however the linux kernel that is being booted will see the internal hard drive as the first hard drive. If I'm not mistaken it will switch around on a reboot and the usb grub2 will see the internal hard drive as the first hard drive. On first boot this should work

Code:

set root(hd1,msdos1)
linux /boot/vmlinuz root=/dev/sda1

on reboots

Code:

set root(hd0,msdos1)
linux /boot/vmlinuz root=/dev/sda1

I believe the use of uuids will solve the problem

drimades · 10-15-2012, 02:52 AM

I created a partition in my HDD (/dev/sda3) and trying to boot the system from there. In the grub shell I write

Code:

set default=0 
set timeout=5
insmod ext2 
set root=(hd0, msdos3)
linux	/boot/vmlinuz root=/dev ro
boot

It start decompressing the kernel and it stops after a while with a Kernel panic fatal exception!

spiky0011 · 10-15-2012, 03:45 AM

Why have you got a partition on hdd for i thought you was using usb

drimades · 10-15-2012, 05:45 AM

I switched to HDD for now to complete the process and start the distribution. As you know, I was having problems with gpt partition and I didn't have time to solve the problems.
Now I'm able to get the bash shell after booting the system. But for know I'm using the image of a kernel I had in my host Ubuntu. With the image I prepared from scratch, I'm having problems (kernel panic). It seems that even if I configured it with make allyesconfig the necessary support for the hardware is still missing.

spiky0011 · 10-15-2012, 06:00 AM

Why not build the kernel as per book