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Full Discussion: How Much Space Before 1st Partition?
Top Forums UNIX for Dummies Questions & Answers How Much Space Before 1st Partition? Post 302926454 by mrm5102 on Monday 24th of November 2014 01:36:45 PM
Old 11-24-2014
Hey Corona, thanks for the reply.

I wish it were that easy... I'm not even sure what I want to do is possible, but here we go...

I have a bunch of CuBox's that boot off SD Cards. The CuBox's use the bootloader called U-Boot. And when I do a straight clone from one card
to another I am unable to boot the cloned SD Card. During the boot process, after the U-Boot screen, I get the error during boot log messages that says;

"Failed to find boot device"

I Believe this is because when I did the first boot of the source sd card (*the one that works), U-Boot writes data specific to that SD Card in
the u-boot.img file and also a compiled file called boot.scr. I also believe it records the Offsets, or has them pre-recorded, of the Kernel image file
that is flashed to the SDCard. The boot.scr file contains the kernel image's addr/offset for where to find it...

Another thing I tried was after I cloned the working SD Card to a new one, I mounted the cloned card to my laptop and ran the command:
Code:
mkimage -A arm -O linux -a 0 -e 0 -T script -C none -n 'Boot-Script' -d /media/root/boot/boot.script /media/root/boot/boot.scr

Which I believe recreates the boot.scr and boot.script files (*which contains all the boot env variables and boot cmds, etc...)

Now, after I did that and I try to boot the SD Card again, I get MUCH further along in the boot process, but I then get stopped at an error message
that says this below (*the name there is the by-id name of the ORIGINAL SD Card...):
Code:
[ ***]  (2 of 2) A start job is running for dev-disk-by\x2did=mmc\x2did=mmc\x2dSD08G_0xda132af2\x2dpart3.device

So I'm thinking the device name is getting written somewhere else in the boot partition, possibly in the zImage-3.14.14-cubox-i kernel
image file or maybe in u-boot.img file... So I thought I would try to take a fresh sd card that has had the OS image flashed to it, but has never
been booted, and copy the MBR and boot partitions from that FRESH SDCard and overwrite the MBR and boot partitions on the CLONED card
and see what happens...

I'm doing this becuase I need to configure about 15 of these CuBox's and I was hoping I could simply configure one SD Card exactly how I want it
then clone the SD Card for the other CUBox's to save A WHOLE LOT OF TIME...

I know when I change Hard Drives on my OpenSuSE laptop and I clone the HDD to a new Drive, I usually just need to edit the HDD names in GRUB and I'm
good to go, but this seems more complicated...

Any ideas?

Thanks Again,
MAtt
 

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LEARN ABOUT DEBIAN

installgrub

installgrub(1M) 														   installgrub(1M)

NAME

       installgrub - install GRUB in a disk partition or a floppy

SYNOPSIS

       /sbin/installgrub [-fm] stage1 stage2 raw-device

       The installgrub command is an -only program. GRUB stands for GRand Unified Bootloader.

       installgrub  installs  GRUB  stage  1  and  stage  2  files on the boot area of a disk partition. If you specify the -m option, installgrub
       installs the stage 1 file on the master boot sector of the disk.

       The installgrub command accepts the following options:

       -f

	   Suppresses interaction when overwriting the master boot sector.

       -m

	   Installs GRUB stage1 on the master boot sector interactively.

       The installgrub command accepts the following operands:

       stage1

	   The name of the GRUB stage 1 file.

       stage2

	   The name of the GRUB stage 2 file.

       raw-device

	   The name of the device onto which GRUB code is to be installed. It must be a character device that is readable and writable.  For  disk
	   devices,  specify  the  slice  where  the  GRUB  menu  file	is  located.  (For Solaris it is the root slice.) For a floppy disk, it is
	   /dev/rdiskette.

       Example 1: Installing GRUB on a Hard Disk Slice

       The following command installs GRUB on a system where the root slice is c0d0s0:

       example# /sbin/installgrub /boot/grub/stage1 
		/boot/grub/stage2 /dev/rdsk/c0d0s0

       Example 2: Installing GRUB on a Floppy

       The following command installs GRUB on a formatted floppy:

       example# mount -F pcfs /dev/diskette /mnt
       # mkdir -p /mnt/boot/grub
       # cp /boot/grub/* /mnt/boot/grub
       # umount /mnt
       # cd /boot/grub
       # /sbin/installgrub stage1 stage2 /dev/rdiskette

       /boot/grub

	   Directory where GRUB files reside.

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+
       |Interface Stability	     |Evolving			   |
       +-----------------------------+-----------------------------+

       boot(1M), fdisk(1M), fmthard(1M), kernel(1M), attributes(5)

       Installing GRUB on the master boot sector (-m option) overrides any boot manager currently installed on the machine. The system will always
       boot the GRUB in the Solaris partition regardless of which fdisk partition is active.

								    24 May 2005 						   installgrub(1M)
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