[U-Boot] qemu-system-arm segfaults on zynq_zed

[Douglas Rupp]

For versatilepb arm, there's a blog post that describes a recipe of how to
build and boot "uboot.bin" in qemu.  It works fine, here's the link if
you're interested.
https://balau82.wordpress.com/2010/03/10/u-boot-for-arm-on-qemu/

I assumed that uboot was standardized enough so that it would work the same
for other machine/board emulations. I'd like to understand why it's not
working.

The problem I'm trying to solve is to configure networking in uboot for the
xilinx-zynq-a9 bsp for vxworks7 running under qemu.  Vxworks7 uses uboot
where 6.9 didn't, and the default device tree isn't set correctly for my
network, it just has some random defaults that are expected to be
customized.  The alternative is to use real hardware, which should work
well enough for debugging but in general it's much easier to debug and run
tests in qemu especially when working remotely.

So any ideas you might have on what's special about zynq utboot would be
appreciated.

On Mon, Nov 24, 2014 at 9:45 AM, Sören Brinkmann <soren.brinkmann at xilinx.com
> wrote:

> I don't think boot.bin is a legal "kernel". IIRC, I had issues running
> on QEMU, but it was slightly better than what you describe.
>
>         Sören
>
> On Mon, 2014-11-24 at 09:40AM -0800, Douglas Rupp wrote:
> >    The result is:
> >
> >    arm-softmmu/qemu-system-arm -M arm-generic-fdt -nographic -smp 2
> -machine
> >    linux=on -serial mon:stdio -dtb devicetree.dtb -kernel boot.bin
> >    SPI device 0x7f8161521ee0
> >    qemu: fatal: Trying to execute code outside RAM or ROM at 0xfffffff0
> >
> >    then a register dump
> >
> >    The "boot.bin" and "devicetree.dtb" is from xilinx binary release
> >    2014.3-release/zed
> >
> >    I tried removing -smp 2 -machine linux=on, and same error.
> >    On Mon, Nov 24, 2014 at 9:21 AM, Sören Brinkmann
> >    <[1]soren.brinkmann at xilinx.com> wrote:
> >
> >      Could you try whether these instructions work?
> >      [2]http://www.wiki.xilinx.com/QEMU
> >
> >              Sören
> >      On Mon, 2014-11-24 at 08:58AM -0800, Douglas Rupp wrote:
> >      > I built qemu-system-arm from the xilinx-master branch.
> >       xilinx-zynq-a9 is
> >      > not a supported machine. :(
> >      >
> >      > On Mon, Nov 24, 2014 at 7:02 AM, Douglas Rupp
> >      <[3]douglas.b.rupp at gmail.com>
> >      > wrote:
> >      >
> >      > > It's the version of qemu-system-arm downloaded for Ubuntu 14.04
> >      > > Version info:
> >      > > qemu-system-arm --version
> >      > > QEMU emulator version 2.0.0 (Debian 2.0.0+dfsg-2ubuntu1.7)
> >      > >
> >      > > I also tried the three "boot.bin" files in
> "2014.3-release.tar.gz"
> >      > > downloaded from the Xilinx website, those in subdirectories
> >      zc70x/zc706/
> >      > > and zc70x/zc702/, and zed/ .  Same command line.  Hangs with no
> >      output.
> >      > >
> >      > > I also tried the version 2.0.0 version of qemu-system-arm from
> the
> >      > > [4]open-do.org website that we regular use with xlnx-zynq-a9
> bsp for
> >      > > vxworks7, it boots vxworks without uboot, but hangs with uboot.
> >      > >
> >      > > You're suggesting that only the qemu-system-arm built from the
> >      xilinx repo
> >      > > is functional with uboot?  I used that version of qemu about a
> year
> >      ago,
> >      > > and it worked fine for Linux but it was an ancient version of
> qemu
> >      (at that
> >      > > time).
> >      > >
> >      > > On Sun, Nov 23, 2014 at 10:17 PM, Jagan Teki
> >      <[5]jagannadh.teki at gmail.com>
> >      > > wrote:
> >      > >
> >      > >> On 24 November 2014 at 06:03, Douglas Rupp
> >      <[6]douglas.b.rupp at gmail.com>
> >      > >> wrote:
> >      > >> > I'm brand new to Uboot, so hopefully this is just some
> missing
> >      switch.
> >      > >> I
> >      > >> > did search the archive, and I was able to build and u-boot a
> >      > >> versaatilepb
> >      > >> > version, but xilinx-zynq-a9 is the one I really need.
> >      > >> >
> >      > >> > u-boot-2014.10$ make zynq_zed_defconfig
> >      > >> > u-boot-2014.10$ make all CROSS_COMPILE=arm-none-eabi-
> ARCH=arm
> >      > >> > u-boot-2014.10$ qemu-system-arm -M xilinx-zynq-a9 -m 1024M
> >      -nographic
> >      > >> > -kernel u-boot-dtb.bin
> >      > >> > Segmentation fault (core dumped)
> >      > >>
> >      > >> I guess it may be qemu usage issue, is qemu from
> >      > >> [7]https://github.com/Xilinx/qemu ?
> >      > >>
> >      > >> + Peter
> >      > >> Hope, he will give some inputs
> >      > >>
> >      > >> >
> >      > >> > What am I doing wrong?
> >      > >>
> >      > >> thanks!
> >      > >> --
> >      > >> Jagan.
> >      > >>
> >      > >
> >      > >
> >
> >      > _______________________________________________
> >      > U-Boot mailing list
> >      > [8]U-Boot at lists.denx.de
> >      > [9]http://lists.denx.de/mailman/listinfo/u-boot
> >
> > Links:
> > 1. mailto:soren.brinkmann at xilinx.com/
> > 2. http://www.wiki.xilinx.com/QEMU
> > 3. mailto:douglas.b.rupp at gmail.com/
> > 4. http://open-do.org/
> > 5. mailto:jagannadh.teki at gmail.com/
> > 6. mailto:douglas.b.rupp at gmail.com/
> > 7. https://github.com/Xilinx/qemu
> > 8. mailto:U-Boot at lists.denx.de/
> > 9. http://lists.denx.de/mailman/listinfo/u-boot
>