[Qemu-devel] Parallel Port Support

[Qemu-devel] Parallel Port Support

[Trev Jackson]

Hi

I have also posted this (QEMU for Linux //// has anyone got their parallel 
port working?) on the QEMU forum regarding this, but since I understand 
parallel port support is recent I thought It might be useful to post on the 
development list as well.

I am trying to capture my parallel port scanner setup data so a Linux driver 
can be written, (portmon for windows doesn't capture anything).

I cannot currently get the scanner working on windows 98SE running on QEMU.

I first downloaded the QEMU binary, but QEMU wouldn't run with the parallel 
port option enabled:

# qemu -parallel /dev/parport0 -dummy-net -enable-audio -localtime -boot c 
windows.img
Could not open '/dev/kqemu' - QEMU acceleration layer not activated
qemu: could not open parallel device '/dev/parport0' 

I did the following to create the /dev/parport0 device:

modprobe parport-pc && modprobe ppdev
rmmod lp

I then ran
makedev /dev

and that created /dev/parport0 to /dev/parport7 

I have now built QEMU 0.7.2 from source and am getting a similar error 
message:

# qemu -parallel /dev/parport0 -dummy-net -enable-audio -localtime -boot c 
windows.img
qemu: could not open parallel device '/dev/parport0'

Is this a problem with my set up or does this problem occur with everyones.

Best Regards

Trev

Re: [Qemu-devel] Parallel Port Support

[Trev Jackson]

Hi everyone

I looked at the code (vl.c) and I don't know if I am missing something, but as 
far as I can see unless the parameter passed to -parallel is either "vc" 
"null" "pty" or "stdio" the function qemu_chr_open function that is called 
returns null, which sets parallel_hds[0] to null, which in turn causes the 
error message "qemu: could not open parallel device" to print and exit the 
program.

Best Regards

Trev

On Tuesday 13 Dec 2005 17:08, Trev Jackson wrote:
> Hi
>
> I have also posted this (QEMU for Linux //// has anyone got their parallel
> port working?) on the QEMU forum regarding this, but since I understand
> parallel port support is recent I thought It might be useful to post on the
> development list as well.
>
> I am trying to capture my parallel port scanner setup data so a Linux
> driver can be written, (portmon for windows doesn't capture anything).
>
> I cannot currently get the scanner working on windows 98SE running on QEMU.
>
> I first downloaded the QEMU binary, but QEMU wouldn't run with the parallel
> port option enabled:
>
> # qemu -parallel /dev/parport0 -dummy-net -enable-audio -localtime -boot c
> windows.img
> Could not open '/dev/kqemu' - QEMU acceleration layer not activated
> qemu: could not open parallel device '/dev/parport0'
>
> I did the following to create the /dev/parport0 device:
>
> modprobe parport-pc && modprobe ppdev
> rmmod lp
>
> I then ran
> makedev /dev
>
> and that created /dev/parport0 to /dev/parport7
>
> I have now built QEMU 0.7.2 from source and am getting a similar error
> message:
>
> # qemu -parallel /dev/parport0 -dummy-net -enable-audio -localtime -boot c
> windows.img
> qemu: could not open parallel device '/dev/parport0'
>
> Is this a problem with my set up or does this problem occur with everyones.
>
> Best Regards
>
> Trev
>
>
>
> _______________________________________________
> Qemu-devel mailing list
> Qemu-devel@nongnu.org
> http://lists.nongnu.org/mailman/listinfo/qemu-devel

Re: [Qemu-devel] Parallel Port Support

[Oliver Gerlich]

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Trev Jackson schrieb:
> Hi everyone
> 
> I looked at the code (vl.c) and I don't know if I am missing something, but as 
> far as I can see unless the parameter passed to -parallel is either "vc" 
> "null" "pty" or "stdio" the function qemu_chr_open function that is called 
> returns null, which sets parallel_hds[0] to null, which in turn causes the 
> error message "qemu: could not open parallel device" to print and exit the 
> program.

Sorry, I guess I overlooked in the forum thread that you use the binary
version :( The host parallel port support is at the moment only
available in the CVS version (the CVS log message is at
http://lists.gnu.org/archive/html/qemu-devel/2005-11/msg00185.html).

So, if you want to use the host parallel port with qemu, you should
upgrade to the current CVS version.
Daily CVS snapshots are available at
http://qemu.dad-answers.com/download/qemu/

Regards,
Oliver
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Re: [Qemu-devel] Parallel Port Support

[Trev Jackson]

>
> Sorry, I guess I overlooked in the forum thread that you use the binary
> version :( The host parallel port support is at the moment only
> available in the CVS version (the CVS log message is at
> http://lists.gnu.org/archive/html/qemu-devel/2005-11/msg00185.html).
>
> So, if you want to use the host parallel port with qemu, you should
> upgrade to the current CVS version.
> Daily CVS snapshots are available at
> http://qemu.dad-answers.com/download/qemu/
>
> Regards,
> Oliver
>
>
Thanks for the answer

The snapshot appears to be 46 bytes in size.
I would be grateful if you would let me know how to download from CVS or how 
to download the snapshot without it downloading only 46 bytes.

Best Regards

Trev

Re: [Qemu-devel] Parallel Port Support

[Oliver Gerlich]

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Trev Jackson schrieb:
>>Sorry, I guess I overlooked in the forum thread that you use the binary
>>version :( The host parallel port support is at the moment only
>>available in the CVS version (the CVS log message is at
>>http://lists.gnu.org/archive/html/qemu-devel/2005-11/msg00185.html).
>>
>>So, if you want to use the host parallel port with qemu, you should
>>upgrade to the current CVS version.
>>Daily CVS snapshots are available at
>>http://qemu.dad-answers.com/download/qemu/
>>
>>Regards,
>>Oliver
>>
>>
> 
> Thanks for the answer
> 
> The snapshot appears to be 46 bytes in size.

Wow... looks like Fabrice stripped down Qemu to its bare minimum during
the past days ;)

Seriously, probably the script which downloads the CVS version every day
broke somehow... But I can confirm that it still worked on 2005-12-07,
though.

> I would be grateful if you would let me know how to download from CVS or how 
> to download the snapshot without it downloading only 46 bytes.

On the Qemu website, on the links page, there's a link to the page which
also hosts the Qemu CVS. The quick link to the relevant page is probably
http://savannah.nongnu.org/cvs/?group=qemu

Regards,
Oliver
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Re: [Qemu-devel] Parallel Port Support

[Johannes Schindelin]

Hi,

On Tue, 13 Dec 2005, Oliver Gerlich wrote:

> Wow... looks like Fabrice stripped down Qemu to its bare minimum during
> the past days ;)
> 
> Seriously, probably the script which downloads the CVS version every day
> broke somehow... But I can confirm that it still worked on 2005-12-07,
> though.

No. Savannah changed the way anonymous checkouts work. If you do a manual 
"cvs update", you'll see a message leading to the forum post. The new 
CVSROOT is :pserver:anonymous@cvs.savannah.nongnu.org:/cvsroot/qemu

Hth,
Dscho

Re: [Qemu-devel] Parallel Port Support

[Andreas Schwab]

Johannes Schindelin <Johannes.Schindelin@gmx.de> writes:

> CVSROOT is :pserver:anonymous@cvs.savannah.nongnu.org:/cvsroot/qemu
                                                         ^^^^^^^

That should be "sources".

Andreas.

-- 
Andreas Schwab, SuSE Labs, schwab@suse.de
SuSE Linux Products GmbH, Maxfeldstraße 5, 90409 Nürnberg, Germany
PGP key fingerprint = 58CA 54C7 6D53 942B 1756  01D3 44D5 214B 8276 4ED5
"And now for something completely different."

Re: [Qemu-devel] Parallel Port Support

[Trev Jackson]

> >
> > Thanks for the answer
> >
> > The snapshot appears to be 46 bytes in size.
>
> Wow... looks like Fabrice stripped down Qemu to its bare minimum during
> the past days ;)
>
> Seriously, probably the script which downloads the CVS version every day
> broke somehow... But I can confirm that it still worked on 2005-12-07,
> though.
>
> > I would be grateful if you would let me know how to download from CVS or
> > how to download the snapshot without it downloading only 46 bytes.
>
> On the Qemu website, on the links page, there's a link to the page which
> also hosts the Qemu CVS. The quick link to the relevant page is probably
> http://savannah.nongnu.org/cvs/?group=qemu
>
> Regards,
> Oliver
>
Hi

I have now downloaded the CVS version of the driver.

I have edited parallel.c and uncommented the #define DEBUG_PARALLEL so that 
the parallel port reads and writes are reported.

I have run qemu as follows:

$ qemu -parallel /dev/parport0 -net none -enable-audio -localtime -boot c 
windows.img 1>printer.txt

The file printer.txt contains lots of printer port reads and writes i.e. it is 
1216 lines long, however I am still getting the "scanner not found" error 
from windows.

I believe the scanner driver is expecting the parallel port to be set to EPP, 
mode. I don't know enough about the parallel port and the emulation software 
to know what it is emulated as at the moment.

From the looks of the file a lot of the reads occur 8 times with the same 
value read back all 8 times, so I would guess the code is expecting the value 
to change and it isn't so I am not sure if it is a speed problem - although I 
wouldn't have thought so because the scanner worked OK on my old 200MHz 
computer and  my current computer is more than 10 times faster than that so 
the emulation layer shouldn't slow it down that much.

Any further advice would be gratefully received.

Best Regards

Trev