Boot issues with custom 64-bit kernel v3.19

[Aditya Basu]

>
>
> On Fri, May 05, 2017 at 04:58:27PM -0400, Aditya Basu wrote:
> > 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.
>
> Great!  Stick with newer kernels, 3.19 is really old, as is 4.2, lots
> and lots of things have been fixed since then, you aren't going to be
> able to get any help from anyone in the community if you use old kernels
> like that, sorry.


​My primary goal is to build and boot LLVM Linux (
http://llvm.linuxfoundation.org/index.php/Main_Page). This project has
patches available only till kernel v3.19. That's why I am trying to use the
older version 3.19.
​


>
>
>
> > Any pointers to what the mistake is?
> >
> > *Linux Kernel Repo used*
> > git://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git
>
> That has all kernel releases _ever_, you need to be a bit more specific
> as to the branch you are using :)
>
>
​I checkout on the tag _v3.19_.



> good luck!
>
> greg k-h
>
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