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 _______________________________________________ Kernelnewbies mailing list Kernelnewbies@xxxxxxxxxxxxxxxxx https://lists.kernelnewbies.org/mailman/listinfo/kernelnewbies
