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hedmo
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 Posted: Wed Jan 19, 2022 4:52 pm Post subject: dracut does not have /dev/disk with u-boot (solved) |
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hi all .
i have a odd problem. At the moment i am using . kexec and all works fine with the initramfs and kernel boot . but when i switch to u-boot it drops me to
dracut shell . when i check dmesg i get :
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dracut warning: /dev/disk/by-uuid/xxxx does not exist
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is there a way to change this for dracut to use root=/dev/mmcblk1p3
regards hedmo
Last edited by hedmo on Fri Jan 28, 2022 5:07 pm; edited 1 time in total |
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alamahant
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| Posted: Wed Jan 19, 2022 5:21 pm Post subject: |
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I guess dracut reads /etc/fstab and /etc/default/grub(maybe) so just avoid uuid in these files.
Use either plain partition naming or partuuid.
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grknight
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Joined: 20 Feb 2015
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| Posted: Wed Jan 19, 2022 5:30 pm Post subject: |
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/dev/disk/by-uuid/ is populated by udev which dracut incorporates into its initramfs.
Most likely, this mmc device is still being discovered by the kernel and registered by the initramfs' udev.
The first thing to try is increasing the time of rd.retry (default 30 seconds) on the kernel command-line so it can be discovered. e.g. rd.retry=180 |
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NeddySeagoon
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| Posted: Wed Jan 19, 2022 5:33 pm Post subject: |
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hedmo,
/dev/disk/by-* symlinks are created by udev, when it gets round to it.
They are not safe to use in the initrd as udev has to start and settle.
Do you have udev in your initrd?
If yes, are the links there when you get dropped into the shell?
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NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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hedmo
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Joined: 29 Aug 2009
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Location: sweden
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| Posted: Wed Jan 19, 2022 6:58 pm Post subject: |
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| NeddySeagoon wrote: | hedmo,
/dev/disk/by-* symlinks are created by udev, when it gets round to it.
They are not safe to use in the initrd as udev has to start and settle.
Do you have udev in your initrd?
If yes, are the links there when you get dropped into the shell? |
NeddySeagoon
when dracut loads it does not find /dev/disk and when i check i the shell it is not there .
| grknight wrote: |
/dev/disk/by-uuid/ is populated by udev which dracut incorporates into its initramfs.
Most likely, this mmc device is still being discovered by the kernel and registered by the initramfs' udev.
The first thing to try is increasing the time of rd.retry (default 30 seconds) on the kernel command-line so it can be discovered. e.g. rd.retry=180 |
can be that . the last thing before the warning is :
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mmc2: new SDIO card at address 0001
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regards hedmo |
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NeddySeagoon
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| Posted: Wed Jan 19, 2022 8:04 pm Post subject: |
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hedmo,
When you go into the shell do you see the /dev entries for your mmc devices.
As you mentioned mmc2, you must have mmc1 and mmc0 too.
They need not be storage devices as SDIO interfaces are used for other things too.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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hedmo
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| Posted: Wed Jan 19, 2022 8:19 pm Post subject: |
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| NeddySeagoon wrote: | hedmo,
When you go into the shell do you see the /dev entries for your mmc devices.
As you mentioned mmc2, you must have mmc1 and mmc0 too.
They need not be storage devices as SDIO interfaces are used for other things too. |
NeddySeagoon
Yes i have :
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mmc0 is internal storage
mmc1 is sd = Gentoo
mmc2 is wifi
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I have /dev/mmcblk1 (Gentoo) . But dont know how to skroll in a terminal
Regards hedmo |
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NeddySeagoon
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| Posted: Thu Jan 20, 2022 6:18 pm Post subject: |
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hedmo,
Console scrolling support was removed from the kernel some time ago.
Now you need to use screen or tmux.
If its command output you want to scroll, pipe it through less.
If less is missing, busybox has the 'more' command.
More only allows forward scrolling.
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Regards,
NeddySeagoon
Computer users fall into two groups:-
those that do backups
those that have never had a hard drive fail. |
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hedmo
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| Posted: Sat Jan 22, 2022 6:35 am Post subject: |
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i did add :
to the command line . but it did not work .i fstab i dont have uuid but /dev/mmcblk1p3 as root .
NeddySeagoon
i dont think i need to scroll . i see that the card is found in dmesg.
regards |
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hedmo
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| Posted: Fri Jan 28, 2022 8:57 am Post subject: |
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even if i use :
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dracut --add-fstab /etc/fstab --hostonly --force '' 5.16.0-rc6-next-20211224
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dracut still want to use udev. i even removed /dev/disk and /dev/block when i created the ramdisk and still it wont boot the ramdisk.
is there a way to use genkernel ?. genkernel wont drop me to a shell but it behaves the same .
regards |
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alamahant
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Joined: 23 Mar 2019
Posts: 3879
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| Posted: Fri Jan 28, 2022 4:39 pm Post subject: |
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Two thoughts:
In fstab and /etc/default/grub try using PARTUUID.
and in dracut.conf
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omit_dracutmodules+=" udev-rules "
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Plz retain the spacing and recreate initramfs.
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hedmo
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Joined: 29 Aug 2009
Posts: 1305
Location: sweden
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| Posted: Fri Jan 28, 2022 5:05 pm Post subject: |
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| alamahant wrote: | Two thoughts:
In fstab and /etc/default/grub try using PARTUUID.
and in dracut.conf
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omit_dracutmodules+=" udev-rules "
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Plz retain the spacing and recreate initramfs. |
alamahant
thank you so much . you dont know how i have been struggling with this  .
i know about the spaces  .
best regards |
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Installing Gentoo
