error with initrd.img

ashraf.qadir · 09-28-2009, 12:12 AM

Hi

I have distro kubuntu 9.04 on my machine with kernel-2.6.28-11. I compiled another custom kernel-2.6.31.1 on my usb. I copied vmlinuz and system.map in my boot and When i tried to make RAMdisk image using "mkinitrd -o /boot/initrd-2.6.31.1.img 2.6.31.1" in my boot i got the warning

"add_modules_dep_2_5: modprobe failed
FATAL: Module sg not found.

WARNING: This failure MAY indicate that your kernel will not boot!
but it can also be triggered by needed modules being compiled into
the kernel."

what does this mean? Is any thing wrong with my compilation?

I also want to know how do i add this kernel in my grub menu list?

Thanks

Ashraf

kbp · 09-28-2009, 07:31 AM

Hi Ashraf,

Do you remember whether you set 'sg' to be a module or compiled into the kernel ? ... if you compiled it in, then the warning should be safe to ignore. As far as adding the new kernel to your boot menu, simply edit /boot/grub/menu.lst, copy an existing entry and modify the version numbers

An entry is usually made up of 4 lines as below:

Code:

title Fedora (2.6.30.5-43.fc11.i586)
	root (hd0,0)
	kernel /vmlinuz-2.6.30.5-43.fc11.i586 ro root=/dev/mapper/vg_xxxxxx-lv_root rhgb quiet
	initrd /initrd-2.6.30.5-43.fc11.i586.img

Note that grub counts each entry(4 lines) when numbering the options, so

Code:

default=0

indicates that grub will boot the first set of 4 lines starting with 'title xxx' by default, the next set will be 1 .. and so on

cheers,

kbp

krkz · 09-28-2009, 03:17 PM

Hi.

First of all, 'sg' refers to the SCSI generic support in your kernel.
More exactly, 'sg' refers to the option CONFIG_CHR_DEV_SG.

Try this cat your/new/config/file | grep -ie sg. And search for the option given previously. Check if it is set to Y or M or not set. It has to be Y or M, afair.

However, if you are completely sure that you wont need SCSI at all, you can ignore that warning.

ashraf.qadir · 09-30-2009, 05:04 PM

thanks for your replies. I am really grateful.

But i forgot to tell that i got another error

"FATAL: Module sd_mod not found" along with the FATAL: Module sg not found.

I guess this is something serious.

Waiting for your feedback.

Thanks

Ashraf