I am trying to compile and boot Linux Kernel v3.19 (64-bit version) using -

    make defconfig
    make kvmconfig
    make -j8
The compilation works out without any errors but it doesn't boot inside qemu or my host machine. I use the following command line parameters to linux: "debug earlyprintk loglevel=7"

The boot hangs at the point -

Booting from ROM...
early console in setup code
early console in decompress_kernel

Decompressing Linux... Parking ELF... done.
Booting the kernel .

Things I have tried so far -

  • Interestingly if I uncheck the 64-bit build in config (from make menuconfig), the resulting 32-bit kernel boots correctly.
  • Have tried running qemu with different cpus (host) + with & without kvm.
    sudo qemu-system-x86_64 -m 4G -append 'debug earlyprintk loglevel=7' -kernel arch/x86/boot/bzImage -cpu host -enable-kvm

I know the kernel will panic because of no root filesystem, but it happens later in the boot process. I am basing this from booting the 32 bit version of the kernel which prints out a lot of stuff and then panics due to no vfs_root.

  • The 64-bit versions of kernel v4.2 and above don't have this issue - meaning they boot correctly.

Any pointers to what the mistake is?

Linux Kernel Repo used: git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git

My Config: https://dl.dropboxusercontent.com/u/9020146/errors/linux_2017_05_05/config-used

QEMU version: QEMU emulator version 2.5.0 (Debian 1:2.5+dfsg-5ubuntu10.11

Your Answer

By clicking "Post Your Answer", you acknowledge that you have read our updated terms of service, privacy policy and cookie policy, and that your continued use of the website is subject to these policies.

Browse other questions tagged or ask your own question.