Moving system from ssd to sd card

[erg_samowzbudnik]

I'm having an issue moving system from ssd to sd card.

My procedure is as follows:

1. Make a stage4 using mkstage4 utility:

[NeddySeagoon]

erg_samowzbudnik,

That looks OK.

Either rootdelay=60 or rootwait should work.
rootdelay=60 is preferred until it works as the kernel will wait 60s they try to mount root, regardless of it being ready or not.
When its not ready, you get a useful panic message.

rootwait will wait forever, which is good when it works as it should be a lot less than 60 sec.

Does your kernel still have SD card support?

As you don't have a screen available, do you have a USB to serial port doda that will suit the Pi?
You need to see whats going one.

Is the disk lable MSDOS or EFI?
Both work with an up to date bootcode.bin
Is the bootable flag set on the boot partition. That used to matter?
_________________
Regards,

NeddySeagoon

Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail.

[pingtoo]

erg_samowzbudnik,

Let's analyse this situation

Your premise is that moving ssd contents exactly as is to sd should be successful for only deference is rootfs location from kernel point of view.

In my mind your steps are correct and I agree with your idea, that only different should be rootfs location.

At the moment your test indicate boot from SD the result is not "pingable". So

• Have you review if your network cable connected correctly?
  
• Have you try to reseat your SD card to make sure its contact will?
  
• Did you leave only SD and remove the SSD connect?
  
• What was you PI led situation after power on?
  
• Was ethernet socket leds lit after sometime you believe your boot sequence finish?
  
• Have you review your /boot/config.txt?

eventually best way to diagnostic this situation is attach a display. so if you are not able to attach HTMI monitor, will you able to attach serial connection?

If you need further diagnostic, please share contents on SD

• We need to know if boot partition have right type as in "fdisk -l /dev/mmcblk0"
  
• content of boot patition as in "ls -l <mountpoint_of_/dev/mmc0blk0p1>"
  
• content of config.txt
  
• cpntent of cmdline.txt

[Logicien]

I had a similar problem with Archlinux on Odroid-Xu4. I had change root=UUID to root=/dev/mmcblk0p1 as kernel parameter in Uboot and fstab. I think the Linux kernel do not recognise device files names at the early boot stage. Sometimes it was booting sometime not even with an initramfs. Put back root=UUID make it work.

I think that most filesystem tools create a UUID at the same time than the filesystem. It's always available to boot with.
_________________
Paul

[erg_samowzbudnik]

Thank you! Got it to a 'pingable' state, even 'ssh-able'!

@NeddySeagoon: thanks for pointing out bootable flag thing, was not on, and for explaining rootwait/rootdelay. rootwait it is then

@pingtoo: thanks for making me check formatting of the SD card ... :