Re: [Qemu-devel] Cutting a new QEMU release

[Shin-ichiro KAWASAKI <kawasaki@juno.dti.ne.jp>]

Rob Landley wrote:
> On Saturday 07 February 2009 09:29:42 Shin-ichiro KAWASAKI wrote:
>> Anthony Liguori wrote:
>>> What do people think?  TCG seems to be in a good place.  We've got
>>> virtio, KVM, live migration, tons of new devices, bsd-user, etc.
>> The development of sh4 is rather slow, you know. Then there is no need to
>> think about it to decide when to cut the next version.
>>
>> From the point of view from sh4 system emulation, that's a good news.
>> It is a good way to provide current features for sh4 developers.
>> But before release, I hope these two points would handled by anyone.
>>
>> [1] USB support
>>
>> Current sh4 system emulation (r2d board) does not support USB host.
>> Without it, the graphic console does not receive any key input
>> via USB keyboard emulation.  Then, graphics console is not available
>> now.  I guess sh4 developers would feel it strange.
>>
>> Following patch adds usb host.
>>
>>     http://lists.gnu.org/archive/html/qemu-devel/2008-12/msg01620.html
>>
>> It does not apply to current svn head, because of line mismatch.
>> I'm willing to post new version, if the patch is OK.
>> Could anyone review it?
>>
>>
>> [2] sh4 kernel & disk image on QEMU's download page
>>
>> It's a bothering work to make kernel & disk image for sh4.  Not to obstruct
>> sh4 developers with it, I provide a small (4MB) set at following URL.
>>
>> http://www.assembla.com/spaces/qemu-sh4/documents/b18oeq850r3AhNab7jnrAJ/do
>> wnload?filename=sh-test-0.1.tar.bz2
> 
> I downloaded this and tried it out with an svn snapshot from today (svn 6613), 
> built on Ubuntu 8.10 with default "./configure; make; sudo make install".

Thank you Rob for trying, and sorry for my mistakes in the package.
I thought again about the contents again, and have uploaded it on the same
URL as before.


> Your README has a typo, it says "-kernel r2d_zImage" but the one you've 
> packaged is just "zImage".  Once that's worked around, it pops up a qemu 
> window within which it boots to a login prompt, but I can't type anything.  
> This is the USB issue you mentioned, confirmed by the stdout from qemu:
> 
>   char device redirected to /dev/pts/14
>   Warning: could not add USB device keyboard
>   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
> 
> I thought I'd work around that with a serial console (which is what I actually 
> use for in my FWL project anyway), but I can't get that to work either.  Your 
> command line -appends "console=ttySC0,115200" and "early_printk=serial" but 
> ctrl-alt-2 shows nothing, and booting with
> -nographic gives no output.
> 
> Also, going back to ctrl-alt-1 doesn't redraw the vga screen.  (The screen 
> will partially redraw itself if it's still producing output, but it never 
> redraws the penguin logo at the top of the frame buffer, and if the console 
> has finished producing output it just stays black from then on.)

Sorry to say, I completely missed to add '-serial null -serial stdio' in the
command line example.  Could you try following line again?

  % ./qemu-system-sh4 -M r2d -kernel zImage -hda sh-linux-mini.img -serial null -serial stdio -nographic

I hope you'll see the shell prompt.


> This is more functionality than I've ever gotten out of sh4, and I really look 
> forward to adding sh4 support to http://impactlinux.com/fwl .  If I can get a 
> serial console working I'm probably good to go, but right now it's not quite 
> working for me yet...
> 
> Your README says that you can extract the config.gz from the kernel with 
> linux/scripts/extract-ikconfig, but when I tried it it said:
> 
>   ERROR: Unable to extract kernel configuration information.
>          This kernel image may not have the config info.
> 
> Obviously, I can't get it by logging in and catting /proc/config.gz without a 
> working keyboard or serial console...

On my Ubuntu 8.04 env, I can't get config with scripts/extract-ikconfig.
On the other hand, with Ubuntu 8.10 env, I can.  I'm not sure about the reason.
Anyway, I removed the explanation about the way to get config before booting.

Additionally, I modified the default kernel boot options slightly,
and ran fsck.ext2 on the disk image before packing.
I hope the package is appropriate for qemu-sh users, now.

I'm looking forward the fwl system image.  I've been struggling
to get stable userland on which gcc is available.


Regards,
Shin-ichiro KAWASAKI