Re: Solution for 855GM video memory issue

2003-09-05 Thread Christian Zietz
Hi,

since there was no 855patch related traffic on the list in the last
weeks and my mailbox is already crammed by Sobig.F, I'm unsubscribing.

So, from now on please CC any mails you want me to read to me.

Christian
http://www.chzsoft.com.ar/855patch.html


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Re: Solution for 855GM video memory issue

2003-08-14 Thread Christian Zietz
Hi,

I made a small webpage for 855patch that summarizes the important
information: http://www.chzsoft.com.ar/855patch.html

Christian


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Re: Solution for 855GM video memory issue

2003-07-28 Thread Christian Zietz
Hi,

Egbert Eich schrieb:

 One could verify if the current value in this location really matches
 the value reported by the BIOS.

I wrote a new version of 855patch which does just that. So it should be
safer to use than before. Everyone interested is invited to try it out:
http://www.chzsoft.com.ar/855patch.tar.gz

 I would like to know if the people from the desktop department from
 Intel would be happy with such a solution. If so, I'd add the code.

If you know whom to ask at Intel please do so. For me as an unknown,
unimportant developer it'll probably be much harder to contact the right
person.

Christian
-- 
Christian Zietz  -  CHZ-Soft  -  [EMAIL PROTECTED]
WWW: http://chzsoft.com.ar/ - Fido: Christian [EMAIL PROTECTED]:2437/74.9
PGP-Key auf Anfrage oder ueber http://wwwkeys.de.pgp.net (Port 11371)


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Re: Solution for 855GM video memory issue

2003-07-21 Thread Egbert Eich
This could easily be integrated in the driver (it would be much more
easy to do than writing a separate program) but like you say in your
disclaimer: we cannot guarantee that nothing bad happens. Therefore
I don't think it is the way to go.
However what I find more interesting is that you updated the BIOS with
one form the Intel web site. Intel claims that this issue has been
fixed with later versions of the BIOS, so that the driver can use a
specific BIOS function to teach the BIOS of the changed size.
Therefore - according to Intel - you should not need this program 
any more.

Egbert.


Christian Zietz writes:
  Hi,
  
  PLEASE CC any answers to [EMAIL PROTECTED] as I'm not subscribed to the list.
  
  first,  my problem as summarized by David H. Dawes:
  It appears that some 855GM-based laptops only pre-allocate 1MB of video
  memory, and don't provide any BIOS configuration options for increasing
  this. Although the XFree86 driver will allocate more (if the correct
  agpgart kernel support is present), the mechanism used to inform the
  video BIOS of the additional allocation doesn't seem to be implemented
  on these laptops. This results in the video BIOS refusing to program
  video modes that require more than 1MB (actually 832KB).
  
  As far as I know there hasn't been any solution for this. So I spent my
  day digging through Intel datasheets and disassembling the Video BIOS
  and came up with a hack that works for me:
  The Video BIOS stores the memory size it thinks it is allocated at a
  certain location in RAM. This location is write-protected by default but
  can me made writable by setting the appropiate chipset registers. That's
  what I do and then I can set the memory size so XFree86 works with
  higher resolutions and color depths.
  
  Since I don't have the XFree86 sources to patch, I implemented this hack
  in a separate program called 855patch. It takes the desired video memory
  size in KB as argument. Note that it only tells the BIOS what memory
  size to expect but does NOT actually allocate the memory. So you'll have
  to set the VideoRAM option in the XF86Config Device section to at least
  the size you used when calling 855patch (more is fine) or your system
  will probably crash.
  
  The hack works nicely on my Dell Inspiron 500m laptop (Intel Video BIOS
  version 2945) and the mechanism I described is also implemented in
  version 2973 I downloaded from Intel.com. So I suggest you try it, if
  you have the problem described above. I'd be very glad if this snippet -
  if it works on other systems - found it's way to XFree86 sources.
  
  Disclaimer: Obviously I can't guarantee that it'll work for you. So
  don't blame me if something bad happens.
  
  Download: http://www.chzsoft.com.ar/855patch.c
  
  Christian Zietz, now able to run XFree86 in 1024x768x16bpp
  
  
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Solution for 855GM video memory issue

2003-07-19 Thread Christian Zietz
Hi,

PLEASE CC any answers to [EMAIL PROTECTED] as I'm not subscribed to the list.

first,  my problem as summarized by David H. Dawes:
It appears that some 855GM-based laptops only pre-allocate 1MB of video
memory, and don't provide any BIOS configuration options for increasing
this. Although the XFree86 driver will allocate more (if the correct
agpgart kernel support is present), the mechanism used to inform the
video BIOS of the additional allocation doesn't seem to be implemented
on these laptops. This results in the video BIOS refusing to program
video modes that require more than 1MB (actually 832KB).

As far as I know there hasn't been any solution for this. So I spent my
day digging through Intel datasheets and disassembling the Video BIOS
and came up with a hack that works for me:
The Video BIOS stores the memory size it thinks it is allocated at a
certain location in RAM. This location is write-protected by default but
can me made writable by setting the appropiate chipset registers. That's
what I do and then I can set the memory size so XFree86 works with
higher resolutions and color depths.

Since I don't have the XFree86 sources to patch, I implemented this hack
in a separate program called 855patch. It takes the desired video memory
size in KB as argument. Note that it only tells the BIOS what memory
size to expect but does NOT actually allocate the memory. So you'll have
to set the VideoRAM option in the XF86Config Device section to at least
the size you used when calling 855patch (more is fine) or your system
will probably crash.

The hack works nicely on my Dell Inspiron 500m laptop (Intel Video BIOS
version 2945) and the mechanism I described is also implemented in
version 2973 I downloaded from Intel.com. So I suggest you try it, if
you have the problem described above. I'd be very glad if this snippet -
if it works on other systems - found it's way to XFree86 sources.

Disclaimer: Obviously I can't guarantee that it'll work for you. So
don't blame me if something bad happens.

Download: http://www.chzsoft.com.ar/855patch.c

Christian Zietz, now able to run XFree86 in 1024x768x16bpp


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