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Full Discussion: Kexec with Live USB/CD
Operating Systems Linux Kexec with Live USB/CD Post 302473278 by Corona688 on Friday 19th of November 2010 10:47:12 AM
Old 11-19-2010
Knowing what "blablabla" actually said would be really, really useful. But if I had to guess?

There's a delay of 5 seconds between Linux detecting a USB storage device and Linux making it available, to let it "settle"(most USB doesn't need this, some really badly-behaved ones do); so it may be trying to mount devices that don't exist yet. Try adding rootdelay=10 to the kernel commandline, which will make it wait a bit. This parameter was created specifically for USB booting as I understand it.

Or if usb-storage is loaded in the initrd instead of being a builtin, you might add your own delay of a few seconds after there somewhere with sleep.

And it may also be that your USB kernel and your running one just don't agree on which device is which, especially since the order of module-loading can easily change it, and/or your USB kernel may not have detected your main disks at all depending on its configuration. For this reason you should be handling UUID inside the initrd, not outside it! When it crashes to the busybox prompt, try mounting sysfs on /sys/ to see what's in /sys/class/block/. That's your window into kernel block devices.

Last edited by Corona688; 11-19-2010 at 12:01 PM..
 

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MIC-LIVECD-ISO-TO-DISK(1)				      General Commands Manual					 MIC-LIVECD-ISO-TO-DISK(1)

NAME
mic-livecd-iso-to-disk - Convert a livecd image to a live USB image then write to a USB disk or partition SYNOPSIS
mic-livecd-iso-to-disk [--reset-mbr] [--noverify] [--overlay-size-mb <size>] [--home-size-mb <size>] [--unencrypted-home] <isopath> [usbstick device] <isopath> is your livecd image path name, [usbstick device] is optional, if not provided, it will detect automatically and ask you to select. DESCRIPTION
mic-livecd-iso-to-disk can convert a livecd image to a live USB image and write it to a USB disk or partition, it is different from mic- image-writer which is just a safer dd with progress bar. mic-livecd-iso-to-disk can detect all the removable USB disks and let you select one of them, if you didn't insert any USB disk, it will ask you to insert until a USB disk is available, it can decide if your USB disk need to be formated and if your USB disk has an appropriate partition for this livecd image, all the operations are interactive and have warnings f they will damage your old data on your USB disk. mic-image-manager has a GUI tool for it. OPTIONS
--reset-mbr Set MBR on your USB disk --noverify Don't verify your livecd image --overlay-size-mb Specify overlay size, the default size is 64 MB --home-size-mb Specify home size, the default is 0 EXAMPLES
Write a Molib live image to your USB disk: mic-livecd-iso-to-disk your-2.1-final.img EXIT STATUS
mic-livecd-iso-to-disk returns a zero exist status if it succeeds, otherwise return non-zero and print error message. AUTHOR
Yi Yang, Anas Nashif, Jianfeng Ding SEE ALSO
mic-image-creator(1), mic-convertor(1), mic-chroot(1), mic-image-writer(1), mic-image-manager(1) perl v5.12.3 2011-05-31 MIC-LIVECD-ISO-TO-DISK(1)
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