Re: [Qemu-devel] Running u-boot on qemu's emulation of arm integratorcp926?

[andrzej zaborowski]

Hi,

On 27/10/06, Michael Opdenacker <address@hidden> wrote:
>     * In my embeded Linux training sessions, to practice with U-boot
>       without having to carry real boards, with their cables and power
>       supplies (which would definitely make customs officers frown and
>       think I'm importing commercial or even sensitive devices).

I've travelled with a full backpack of rare PC intestines and the
customs didn't mind but I guess it depends.

>     * For students and community members, to get familiar with U-boot
>       without having to get real hardware.
>     * To create qemu/U-boot demos, showing the capabilities of both tools.
>
> Has anyone already experimented with this? I haven't found any useful
> detail on the net yet.

Well, I've been running U-boot in qemu-system-arm but it was on the
old OMAP 310 board emulator, which is currently stalled. Never tried
the integrator version. All I can say is it worked like on the real
board.

> As I have no U-boot development knowledge yet, I started in a naive,
> optimistic way:
>
>     * Got U-boot 1.1.5 sources
>     * Configured U-boot for the arm integratorcp926 board:
>       make make cp926ejs_config
>     * Compiled U-boot with a gcc 3.4.x cross compiling toolchain for arm:
>       export PATH=/usr/local/uclibc-0.9.28-3/arm/bin:$PATH
>       make
>     * Ran qemu:
>       qemu-system-arm -kernel ~/tmp/tmp/u-boot-1.1.5/u-boot.bin -nographic
>
> (qemu) qemu: fatal: Board reset
> R00=10000000 R01=00000008 R02=00000013 R03=00000000
> R04=00000000 R05=00000000 R06=00000000 R07=00000000
> R08=00000000 R09=00000000 R10=00000000 R11=00000000
> R12=00010064 R13=00000000 R14=000100f4 R15=000103a0

Executing "info symbol 0x000103a0" or even "edit *0x000103a0" should
tell you where in the source u-boot tried to reboot, and maybe why.
You would run gdb this way:

cd ~/tmp/tmp/u-boot-1.1.5/
arm-yourtoolchain-gnu-linux-gdb u-boot.elf      # or similar

You could even do this and connect to qemu over the socket and then do:
(gdb) break *0x000103a0
(gdb) c
and you would maybe get a backtrace.

> PSR=800001d3 N--- A svc32 bff14784
> s00=00000000(0.000000) s01=00000000(0.000000) d00=0000000000000000(0.000000)
> s02=00000000(0.000000) s03=00000000(0.000000) d01=0000000000000000(0.000000)
> s04=00000000(0.000000) s05=00000000(0.000000) d02=0000000000000000(0.000000)
> s06=00000000(0.000000) s07=00000000(0.000000) d03=0000000000000000(0.000000)
> s08=00000000(0.000000) s09=00000000(0.000000) d04=0000000000000000(0.000000)
> s10=00000000(0.000000) s11=00000000(0.000000) d05=0000000000000000(0.000000)
> s12=00000000(0.000000) s13=00000000(0.000000) d06=0000000000000000(0.000000)
> s14=00000000(0.000000) s15=00000000(0.000000) d07=0000000000000000(0.000000)
> s16=00000000(0.000000) s17=00000000(0.000000) d08=0000000000000000(0.000000)
> s18=00000000(0.000000) s19=00000000(0.000000) d09=0000000000000000(0.000000)
> s20=00000000(0.000000) s21=00000000(0.000000) d10=0000000000000000(0.000000)
> s22=00000000(0.000000) s23=00000000(0.000000) d11=0000000000000000(0.000000)
> s24=00000000(0.000000) s25=00000000(0.000000) d12=0000000000000000(0.000000)
> s26=00000000(0.000000) s27=00000000(0.000000) d13=0000000000000000(0.000000)
> s28=00000000(0.000000) s29=00000000(0.000000) d14=0000000000000000(0.000000)
> s30=00000000(0.000000) s31=00000000(0.000000) d15=0000000000000000(0.000000)
> FPSCR: 00000000
> Aborted
>
> Now, I know that as usual,  I need time and patience to get more
> familiar with the emulated board and with U-boot requirements.
>
> However, if any of you has suggestions for doing that or experience to
> share, your are most welcome!
>
>     I will keep you posted in the next days and weeks.
>
>     Cheers,
>
>     Michael.
>
> --
> Michael Opdenacker, Free Electrons
> Free Embedded Linux Training Materials
> on http://free-electrons.com/training
> (More than 1000 pages!)
>
>
>
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Hope this helps,
Andrew