Boot issues with custom 64-bit kernel v3.19

[Aditya Basu]

I'll try it out with 4.11 and 4.12-rc1.

Thanks,
Aditya

On Mon, May 22, 2017 at 11:43 AM, Greg KH <greg at kroah.com> wrote:

> On Mon, May 22, 2017 at 11:29:29AM -0400, Aditya Basu wrote:
> >
> >     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.
>
> 4.11 should build/boot using llvm, or if not, I think 4.12-rc1 can, as
> the remaining changes went in then.
>
> No need to stick with an obsolete kernel version just to try out an
> alternative compiler :)
>
> good luck!
>
> greg k-h
>



-- 
Regards,
Aditya Basu
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