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How to combine linux kernel and initrd without compiling?

I know that it's possible to extract from a linux kernel the embedded initramfs cpio. I want to know if the reverse operation is possible; i.e., given both a compiled kernel and initramfs archive, how ...
2
votes
0answers
188 views

Using an initrd/initramfs as the root filesystem

In Android, the initial RAM disk stays mounted throughout the entirety of the time the operating system is running. No switch_root/pivot_root takes place. Is this kind of setup easy to pull off with ...
2
votes
1answer
1k views

Proper manual OS setup on LUKS encrypted drive with non-aes algorithm on yum-based distro (CentOS)

I'm trying to achieve LUKS-encrypted CentOS 7 install with separate /boot partition and lvm on EFI-friendly motherboard. I've done partitioning fresh CentOS install from old CentOS(installed from GUI)...
2
votes
0answers
601 views

Cannot boot kali linux after dist-upgrade, stucks at 'Loading initial ramdisk …'

I did a dist-upgrade from 4.3.0-kali1-amd64 to 4.4.0-kali1-amd64 but when I restart, the screen stucks at 'Loading initial ramdisk ...'. I had to use the advanced boot options to boot using 4.3.0-...
2
votes
1answer
1k views

How can I replace root / filesystem with another filesystem?

When the Linux kernel starts up, it uses initrd as the root / filesystem, then replaces that with a filesystem partition in fstab. Based on a test in an early init script, I want to replace that root ...
2
votes
0answers
1k views

Why do I need to specify two init images - initrd and boot - inside KVM to boot to bash?

My machine is running inside a KVM virtual machine (Parallels Desktop v8), having a BIOS (not UEFI), having one SATA drive connected, one GPT partition on that disk, the partition is ext4 formatted, ...
1
vote
0answers
24 views

Initramfs not reading new configuration/scripts

I am trying to add some custom initramfs scripts to /etc/initramfs-tools/scripts/init-bottom/. However, these are not executed at next boot, after having rebuilt with # update-initramfs -u In fact, ...
1
vote
0answers
200 views

Why can't dd write to /dev/ram0 on Core Linux?

I created an ext2 file-system on /dev/ram0 ramdisk, and mounted it at /mnt/ram. mkdir /mnt/ram mkext2fs /dev/ram0 sudo mount /dev/ram0 /mnt/ram -o rw Reading from ramdisk with dd works. dd if=/dev/...
1
vote
1answer
283 views

How to use only automatically build RAID arrays on Ubuntu?

I have an Ubuntu 16.06 system where / on an SSD primary partition and /home with md RAID0 on four SSD devices. The file /etc/mdadm/mdadm.conf is automatically generated by mkconf and contains no ...
1
vote
0answers
360 views

Mounting real rootfs after initial booting using initrd

I'm booting kernel with root=/dev/ram0 on a embedded environment. After initial booting, how can I mount real rootfs present at /dev/mtd3 and make it as the only rootfs. I'm using root=/dev/ram0 ...
0
votes
0answers
41 views

trap signal in bash initramfs fails to work

inside /init bash script executed by the kernel in initramfs.img i need to send a signal to drop me to a rescue shell, so i have trap "exec /bin/bash" SIGINT but ctrl+C isn't effective. First why ...
0
votes
0answers
183 views

How to find modules used in initrd?

Is there a way to see all the kernel modules/drivers put in the initrd/intramfs?
0
votes
0answers
350 views

Accessing initramfs-tools features in Yocto generated initramfs image

I would like to load a few kernel modules, and activate framebuffer access prior to Plymouth launch. This is normally done using /etc/initramfs-tools directory provided with the initramfs-tools. ...