Re: [Qemu-discuss] Trouble getting ARM Linux kernel to boot

[Ezequiel Garcia]

On Mon, Sep 24, 2012 at 9:34 PM, Steven Frank <address@hidden> wrote:
>
> On Sep 21, 2012, at 5:51 PM, Ezequiel Garcia <address@hidden> wrote:
>
> On Fri, Sep 21, 2012 at 7:03 PM, Steven Frank <address@hidden> wrote:
>
>
> On Sep 21, 2012, at 11:59 AM, Ezequiel Garcia <address@hidden> wrote:
>
> I am using a Mac OS X host to build the Linux 3.5 kernel for ARM, and trying
> to boot it in QEMU 1.2.0.
>
> The kernel, to my surprise, built fine on my Mac using the arm-none-eabi-gcc
> toolchain from MacPorts.  I'm using the versatile_defconfig, since that
> turned up a lot when I was Googling how to do this.
>
> Then I try to boot my kernel in QEMU using this command line:
>
>       arm-softmmu/qemu-system-arm -m 16 -M versatilepb -kernel
> arch/arm/boot/zImage -serial stdio
>
> I don't have a rootfs yet -- I was hoping to just get as far as seeing the
> kernel boot messages.
>
> It outputs this:
>
>       Uncompressing Linux... done, booting the kernel.
>
> Then hangs, with an empty white window.  Nothing further appears to happen.
>
>
> I had the same problem just yesterday. Try with older kernel 2.6.32 /
> 2.6.38 and let me know.
>
> Also, what kernel config are you using?
>
>
> I'm using the versatile_defconfig to (hopefully) match up with QEMU's
> "versatilepb" machine.
>
> I just tried 2.6.32 and 2.6.38.  Same results, although 2.6.32 outputs more
> dots between "Uncompressing Linux" and "booting the kernel".  But both hang
> at the blank white screen, just like 3.5 did.
>
> There is one other interesting difference.  When trying to boot 2.6.32, QEMU
> remains responsive.  In other words, it responds to events like Cmd-Q to
> quit.  With the later kernels, QEMU hangs completely and must be force-quit
> (killed).
>
> Very curious.  Any thoughts?
>
>
> It was working yesterday. Let me check my qemu / kernel version and
> the parameters
> I'm using....
>
>
> I think I finally located the problem.
>
> The QEMU binary is defective when built with Apple's LLVM-based toolchain,
> as documented here:
>
> https://bugs.launchpad.net/qemu/+bug/925412
>
> My workaround was to install gcc 4.8 using MacPorts:
>
> sudo port install gcc48
>
> Configure and build QEMU like so:
>
> ./configure --disable-sdl --disable-kvm --target-list=arm-softmmu
> --cc=x86_64-apple-darwin12-gcc-4.8.0
> --host-cc=x86_64-apple-darwin12-gcc-4.8.0
>
> And now I can boot my compiled-from-source Linux kernel.
>

Nice! Which kernel version are you using?
Care to send your kernel config?

Also, have you tried mtd emulated devices? I had some problems with it.

Ezequiel.