Bug 20

Summary: Kernel AGP support needs to be initialized sooner
Product: Drivers Reporter: Joseph Fannin (jfannin)
Component: Video(AGP)Assignee: Dave Jones (davej)
Status: CLOSED CODE_FIX    
Severity: low    
Priority: P2    
Hardware: IA-32   
OS: Linux   
Kernel Version: Subsystem:
Regression: --- Bisected commit-id:

Description Joseph Fannin 2002-11-14 13:25:47 UTC 
The kernel AGP drivers need to be initialized earlier in the boot process    
-- before the framebuffer system.  This is needed for Antonio Daplas's    
framebuffer driver for the i810 video chipset which has no video memory of its    
own and must use the AGP GART to get linear memory for the framebuffer driver.    
 
  Issues like this are why this driver is not merged yet. :-)
Comment 1 Dave Jones 2002-11-22 07:28:24 UTC 
Should be as simple as reordering the entry in the Makefile so that AGP gets
linked before the video/ bits shouldn't it ?  Or is something else needed ?
Comment 2 Joseph Fannin 2002-11-25 18:11:41 UTC 
I think so, but James Simmons would be the one who knows.  He submitted this   
change, or a part of it, as part of a larger fbdev patch, but this part was   
rejected because it was too much at once and made for a very large changeset.   
   
The thread where this was discussed on LKML is archived : <a 
href="http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=fa.fcagvav.1agmfgf%40ifi.uio.no&rnum=2&prev=/groups%3Fq%3Dfbdev%2Bi810%2Bgroup:fa.linux.kernel%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm%3Dfa.fcagvav.1agmfgf%2540ifi.uio.no%26rnum%3D2%26filter%3D0">http://groups.google.com/groups?hl=en&lr=&ie=UTF-8&threadm=fa.fcagvav.1agmfgf%40ifi.uio.no&rnum=2&prev=/groups%3Fq%3Dfbdev%2Bi810%2Bgroup:fa.linux.kernel%26hl%3Den%26lr%3D%26ie%3DUTF-8%26selm%3Dfa.fcagvav.1agmfgf%2540ifi.uio.no%26rnum%3D2%26filter%3D0</a>
Comment 3 Dave Jones 2002-12-10 09:22:54 UTC 
Fix is now in agpgart bk tree (bk://linux-dj.bkbits.net/agpgart) and will go to
Linus for 2.5.52

Note, that i810fb needs to call agp_init() for this to work. The fix was just to
allow the agp_init() routine to be called explicitly, and multiple times (and do
nothing on subsequent calls).
Comment 4 Bug Me Administrator 2002-12-17 14:31:54 UTC 
Changed category to Drivers.