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KatsuoRyuu
n00b
Joined: 08 Nov 2016
Posts: 54
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 Posted: Sun Mar 22, 2020 5:51 pm Post subject: Booting from IMG file fails root block device not found in |
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Hi
Im trying to boot Gentoo from a IMG file, and is somewhat successfull.
The kernel, initramfs, ucode are being loaded, but as soon as they are loaded im getting an error saying the system is unable to find the root block device.
i am using the following configuration:
/etc/40_custom:
| Code: |
menuentry "Gentoo IMG file" {
load_video
set gfxpayload=keep
insmod gzio
insmod part_gpt
insmod ext2
set imgfile="/boot/5.5.5-gentoo-v1-amdgpu-2020-03-21.img"
set kernelimg="/boot/kernel-genkernel-x86_64-5.5.5-gentoo-v1-amdgpu"
set initramfs="/boot/initramfs-genkernel-x86_64-5.5.5-gentoo-v1-amdgpu"
set initucode="/boot/amd-uc.img"
search --no-floppy -f --set=root_partition $imgfile
probe -u $root_partition --set=disk_uuid
set root_disk="/dev/disk/by-uuid/$disk_uuid"
loopback loop $imgfile
echo 'Loading Linux x86_64-5.5.5-gentoo-v1-amdgpu from IMG file ...'
linux (loop)$kernelimg img_dev=$root_disk img_loop=$imgfile init=/usr/lib/systemd/systemd boot=casper splash=silent,theme:gentoo console=tty1 quiet
echo 'Loading initial ramdisk from IMG file ...'
initrd (loop)$initucode (loop)$initramfs
}
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I know normally you would set the `root=/dev/xzy` but i dont know how to set this when booting from an image.
I hope anybody has been playing with this before and is able to help? |
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fturco
Veteran
Joined: 08 Dec 2010
Posts: 1181
Location: Italy
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| Posted: Sun Mar 22, 2020 6:36 pm Post subject: |
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| Please post the contents of the GRUB_CMDLINE_LINUX variable from /etc/default/grub. |
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KatsuoRyuu
n00b
Joined: 08 Nov 2016
Posts: 54
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| Posted: Sun Mar 22, 2020 6:50 pm Post subject: |
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Hi Fturco
| Code: |
GRUB_CMDLINE_LINUX="init=/usr/lib/systemd/systemd"
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if there is anything else needed please let me know, on a note this implementation is a custom menuentry dont know what that variable will help with? |
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KatsuoRyuu
n00b
Joined: 08 Nov 2016
Posts: 54
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| Posted: Mon Mar 23, 2020 5:35 am Post subject: |
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So I have noticed that grub is booting correctly, but after the initial load from grub it seems gentoo is unable to find the mountable root file system.
basically upon boot you get a console where you and enter the root block device.
if i enter `/dev/sda2` which is my boot drive it starts without any problem. But my `/` is now the harddrive, I would like to have the iso/img file as the rootfs. This would be for a secure rescue option or a custom system.
My thinking is i would either set it to load `/dev/sda2` as the root drive and then bind the dirs from the image to the /etc /bin /lib etc but I feel that is the wrong way to do it.
I found that Manjaro seems to be able to boot from an iso image, with my current configuration, so im wondering if there is something i am missing somewhere else.
Anybody tried this before? |
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fturco
Veteran
Joined: 08 Dec 2010
Posts: 1181
Location: Italy
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| Posted: Mon Mar 23, 2020 10:02 am Post subject: |
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I don't know if this can help you, but I have a USB flash drive with ISO images from Ubuntu.
Example GRUB configuration:
| Code: | menuentry "Ubuntu 19.10" {
set iso=/iso/ubuntu-19.10-desktop-amd64.iso
loopback loop $iso
linux (loop)/casper/vmlinuz boot=casper quiet splash iso-scan/filename=$iso
initrd (loop)/casper/initrd
} |
Gentoo ISO images probably need a different set of parameters, but I haven't tried doing that yet. |
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KatsuoRyuu
n00b
Joined: 08 Nov 2016
Posts: 54
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| Posted: Sat Apr 18, 2020 8:06 am Post subject: |
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Sorry for the late reply.
I will try looking into this, thanks for the suggestion, will report back if it works |
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