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Yes, thanks, that did it, |
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Helmut |
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On 06/25/2016 10:19:12 PM, Tom H wrote: |
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> On Sat, Jun 25, 2016 at 2:33 PM, Helmut Jarausch <jarausch@××××××.be> |
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> wrote: |
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> > |
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> > I'm a dino since I still use grub-1 but I prefer recent kernels |
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> (currently |
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> > 4.70-rc4) |
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> > |
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> > I don't understand the 'root=' option on the boot line like |
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> > kernel /boot/vmlinuz-4.7.0-rc4 root=/dev/sda1 |
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> > |
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> > Here my bad experience: |
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> > |
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> > Having booted by SystemRescueCD from the cdrom device, my root |
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> device is |
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> > labelled /dev/sda1 |
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> > BUT trying to use that on the kernel boot line fails (the kernel |
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> cannot |
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> > find the root file system) |
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> > |
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> > By trial and error I've found that I have to use root=/dev/sdb1 |
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> > |
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> > but if I plug in an external drive (via USB) this doesn't work any |
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> more. |
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> > |
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> > So, I came up with root=UUID=uuid_number of the root file system. |
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> > |
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> > But to my surprise I now got a kernel panic |
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> > syncing: VFS: unable to mount root fs on unknown block(0,0) |
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> > |
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> > So, please tell me what I'm missing? |
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> |
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> Are you using an initramfs? You can't use "root=UUID=uuid" if you |
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> don't. |
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> |
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> You can use "root=PARTUUID=partuuid" where |
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> |
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> on an msdos-labeled disk: |
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> |
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> # findmnt / -o TARGET,SOURCE,PARTUUID |
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> TARGET SOURCE PARTUUID |
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> / /dev/sda1 0006c8d7-01 |
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> |
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> on a gpt-labeled disk: |
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> |
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> # findmnt / -o TARGET,SOURCE,PARTUUID |
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> TARGET SOURCE PARTUUID |
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> / /dev/sda3 41e9268f-484a-43e2-ae81-54d8c84119e0 |
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> |
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> |
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> |
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