CentOS - Jul 2015 - Installing from USB

I found this http://wiki.centos.org/HowTos/InstallFromUSBkey

So for centos 7 if did the dd command seemed to work great.
I did the install.

So now I'd like to "modify" the USB key to add a boot menu option
with my
customer install options. I mounted /dev/sdb2 and edited the file
/mnt/usb/EFI/BOOT/grub.conf

added my menu item and rebooted to try to use it.
It does not show up in the menu.

How do I get the USB to use my new menu?

Thanks

Jerry

On Sun, Jul 12, 2015 at 1:11 PM, Jerry Geis <geisj at pagestation.com>
wrote:
> I found this http://wiki.centos.org/HowTos/InstallFromUSBkey
>
> So for centos 7 if did the dd command seemed to work great.
> I did the install.
>
> So now I'd like to "modify" the USB key to add a boot menu
option with my
> customer install options. I mounted /dev/sdb2 and edited the file
> /mnt/usb/EFI/BOOT/grub.conf
>
> added my menu item and rebooted to try to use it.
> It does not show up in the menu.
>
> How do I get the USB to use my new menu?
Does the computer have UEFI or BIOS firmware? If BIOS you need to edit
the isolinux.cfg, and I'm pretty sure when this is media created by
dd, the isolinux.cfg is not on a FAT volume, it's on the ISO 9660
volume which is read only. You'd need to use livecd-iso-to-disk to
create the install media, which ought to put both boot loaders on FAT
and is thus editable.


-- 
Chris Murphy