Re: [Qemu-arm] Booting Raspbian on RPi emulation

[Guenter Roeck]

On 11/29/18 6:42 PM, BALATON Zoltan wrote:
> On Thu, 29 Nov 2018, Guenter Roeck wrote:
> > On 11/29/18 4:43 PM, Philippe Mathieu-Daudé wrote:
> > > Hi Zoltan,
> > >
> > > On 29/11/18 21:29, BALATON Zoltan wrote:
> > > > Hello,
> > > >
> > > > I could not boot Raspbian on QEMU's raspi emulation and I'm not sure why
> > > > it fails. So question is if this is supposed to work or am I doing
> > > > something wrong or any clues what may be missing? I'm trying with this
> > > > command line with v3.1.0-rc3:
> > > >
> > > > qemu-system-arm -M raspi2 -serial stdio \
> > > > -kernel rpi-kernel7.img -dtb bcm2709-rpi-2-b.dtb \
> > > > -append "rw earlyprintk loglevel=8 console=ttyAMA0,115200
> > > > dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2" \
> > > > -drive file=2018-10-09-raspbian-stretch-lite.img,format=raw,if=sd
> > > >
> > > > Kernel starts to boot, I see raspberries on the guest screen and log
> > > > output to serial:
> > > >
> > > > Booting Linux on physical CPU 0xf00
> > > > Linux version 4.14.71-v7+ (address@hidden) (gcc version 4.9.3
> > > > (crosstool-NG crosstool-ng-1.22.0-88-g8460611)) #1145 SMP Fri Sep 21
> > > > 15:38:35 BST 2018
> > > > CPU: ARMv7 Processor [410fc075] revision 5 (ARMv7), cr=10c5387d
> > > > [...]
> >
> > My version (https://github.com/groeck/qemu) seems to work, using
>
> Tried with your v3.1.0-local branch but got same results (does not find mmcblk0 
> on raspi2, nothing on raspi3) so probably it's not one of the patches in your 
> tree that's missing.
>
> > multi_v7_defconfig.
>
> Then maybe it's your kernel config that's different? Do you have compiled 
> kernels available that I could try?

Shouldn't be, but I attached my configuration. This time with v4.14.84 and
"make ARCH-arm savedefconfig" after building the image. The output is identical
to "make ARCH=arm multi_v7_defconfig; make ARCH=arm savedefconfig".

Oh, and here is my qemu configuration.

--disable-user --disable-gnutls --disable-docs \
        --disable-nettle --disable-gcrypt --disable-vnc-png \
        --disable-xen --disable-xen-pci-passthrough \
        --enable-debug --disable-strip

That should not make a difference either, but who knows.
Just to be sure, I copied a kernel and a root file system
to http://server.roeck-us.net/qemu/arm-raspi2/

Hope it helps.

Guenter

defconfig
Description: Text document