Re: [Qemu-devel] qemu-system-sh4 broken again.

[Aurelien Jarno <aurelien@aurel32.net>]

On Sat, Mar 13, 2010 at 01:51:35AM -0600, Rob Landley wrote:
> Using qemu-system-sh4, this commit:
> 
> e1c09175bc00dd8dfb2ad1b26e1858dcdc109b59 is first bad commit
> commit e1c09175bc00dd8dfb2ad1b26e1858dcdc109b59
> Author: Gerd Hoffmann <kraxel@redhat.com>
> Date:   Tue Dec 8 13:11:44 2009 +0100
> 
>     zap serial_monitor_mux
>     
>     The logic in this code obviously predates the multiple monitor
>     capability of qemu and looks increasingly silly these days.
>     
>     I think the intention of this piece of code is to get a reasonable
>     default for the -nographic case: have monitor and serial line muxed
>     on stdio.
>     
>     With the new default_serial and default_monitor variables we have now
>     doing just that became much easier ;)
>     
>     Signed-off-by: Gerd Hoffmann <kraxel@redhat.com>
>     Signed-off-by: Anthony Liguori <aliguori@us.ibm.com>
> 
> Made "-serial stdio" now do:
> 
>   chardev: opening backend "stdio" failed
>   qemu: could not open serial device 'stdio': Inappropriate ioctl for device
> 
> Am I using it wrong?
> 
> If I don't override it, I instead get:
> 
>   long read to SH7750_WCR1_A7 (0x000000001f800008) ignored
>   long read to SH7750_WCR2_A7 (0x000000001f80000c) ignored
>   long read to SH7750_WCR3_A7 (0x000000001f800010) ignored
>   long read to SH7750_MCR_A7 (0x000000001f800014) ignored
>   long read to SH7750_MCR_A7 (0x000000001f800014) ignored
>   sh_serial: unsupported read from 0x10
>   qemu-system-sh4: /home/landley/qemu/git/hw/sh_serial.c:285:
>     sh_serial_ioport_read: Assertion `0' failed.
> 
> Is anybody out there actually using the sh4 emulator?  I've gotten it to work 
> several times before on various random git snapshots, but never in a release 
> version...
> 

Would be nice to give that you give the actual command line to try to
use. I am using the stable-0.12 branch (plus some backporting patches
for the MMU) to do development on sh4. HEAD still works correctly here.
I am using the following command line:

~/git/qemu/sh4-softmmu/qemu-system-sh4 -M r2d -kernel zImage -drive file=sh4.img -serial null -serial stdio -usb -append "root=/dev/sda1 console=tty0 console=ttySC0,115200 noiotrap" -usbdevice keyboard -usbdevice mouse


-- 
Aurelien Jarno	                        GPG: 1024D/F1BCDB73
aurelien@aurel32.net                 http://www.aurel32.net