<div dir="ltr"><div class="gmail_extra"><div class="gmail_quote"><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><div class="gmail-HOEnZb"><div class="gmail-h5"><br>On Fri, May 05, 2017 at 04:58:27PM -0400, Aditya Basu wrote:<br>
> I am trying to compile and boot Linux Kernel v3.19 (64-bit version) using -<br>
><br>
> make defconfig<br>
> make kvmconfig<br>
> make -j8<br>
><br>
> The compilation works out without any errors but it doesn't boot<br>
> inside qemu or my host machine.<br>
> I use the following command line parameters to linux: "debug<br>
> earlyprintk loglevel=7"<br>
><br>
> # The boot hangs at the point -<br>
> ##############################<wbr>######<br>
> Booting from ROM...<br>
> early console in setup code<br>
> early console in decompress_kernel<br>
><br>
> Decompressing Linux... Parking ELF... done.<br>
> Booting the kernel .<br>
> ##############################<wbr>######<br>
><br>
> # Things I have tried so far:<br>
> - Interestingly if I uncheck the 64-bit build in config (from make<br>
> menuconfig), the resulting 32-bit kernel boots correctly.<br>
><br>
> - Have tried running qemu with different cpus (host) + with & without kvm.<br>
><br>
> sudo qemu-system-x86_64 -m 4G -append 'debug earlyprintk loglevel=7'<br>
> -kernel arch/x86/boot/bzImage -cpu host -enable-kvm<br>
><br>
> I know the kernel will panic because of no root filesystem, but it<br>
> happens later in the boot process. I am basing this from booting the<br>
> 32 bit version of the kernel which prints out a lot of stuff and then<br>
> panics due to no vfs_root.<br>
><br>
> - The 64-bit versions of kernel v4.2 and above don't have this issue -<br>
> meaning they boot correctly.<br>
<br>
</div></div>Great! Stick with newer kernels, 3.19 is really old, as is 4.2, lots<br>
and lots of things have been fixed since then, you aren't going to be<br>
able to get any help from anyone in the community if you use old kernels<br>
like that, sorry.</blockquote><div><br></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;display:inline">My primary goal is to build and boot LLVM Linux (<a href="http://llvm.linuxfoundation.org/index.php/Main_Page">http://llvm.linuxfoundation.org/index.php/Main_Page</a>). This project has patches available only till kernel v3.19. That's why I am trying to use the older version 3.19.</div></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small;display:inline"></div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"> <br></blockquote><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex"><span class="gmail-">
><br>
> Any pointers to what the mistake is?<br>
><br>
> *Linux Kernel Repo used*<br>
> git://<a href="http://git.kernel.org/pub/scm/linux/kernel/git/stable/linux-stable.git" rel="noreferrer" target="_blank">git.kernel.org/pub/scm/<wbr>linux/kernel/git/stable/linux-<wbr>stable.git</a><br>
<br>
</span>That has all kernel releases _ever_, you need to be a bit more specific<br>
as to the branch you are using :)<br>
<br></blockquote><div><br></div><div><div class="gmail_default" style="font-family:tahoma,sans-serif;font-size:small">I checkout on the tag _v3.19_.</div><br></div><div> </div><blockquote class="gmail_quote" style="margin:0px 0px 0px 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">
good luck!<br>
<br>
greg k-h<br>
<div class="gmail-HOEnZb"><div class="gmail-h5"><br>
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