>Number:         23860
>Category:       kern
>Synopsis:       no agp(4) support for 82845G/GL without integrated video device
>Confidential:   no
>Severity:       non-critical
>Priority:       low
>Responsible:    kern-bug-people
>State:          open
>Class:          sw-bug
>Submitter-Id:   net
>Arrival-Date:   Tue Dec 23 17:15:00 UTC 2003
>Closed-Date:
>Last-Modified:
>Originator:     Nicolas Joly
>Release:        NetBSD 1.6ZG (-current)
>Organization:
	Institut Pasteur
>Environment:
System: NetBSD cluster3.sis.pasteur.fr 1.6ZG NetBSD 1.6ZG (GENERIC) #8: Tue Dec 23 16:21:32 CET 2003 njoly@hal.sis.pasteur.fr:/local/src/NetBSD/obj/i386/sys/arch/i386/compile/GENERIC i386
Architecture: i386
Machine: i386
>Description:
NetBSD has partial agp(4) support for 82845G/GL. It works fine if the
corresponding intergrated 82845G graphics device is present, but support
is missing otherwise :

[...]
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82845G/GL DRAM Controller / Host-Hub I/F Bridge (rev. 0x03)
agp0 at pchb0: can't find internal VGA device config space
ppb0 at pci0 dev 1 function 0: Intel 82845G/GL Host-to-AGP Bridge (rev. 0x03)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
[...]
vga1 at pci1 dev 0 function 0: ATI Technologies product 0x5446 (rev. 0x00)
wsdisplay0 at vga1 kbdmux 1: console (80x25, vt100 emulation)
wsmux1: connecting to wsdisplay0

>How-To-Repeat:
>Fix:

Apply the following patch, and check agp messages:

[...]
pchb0 at pci0 dev 0 function 0
pchb0: Intel 82845G/GL DRAM Controller / Host-Hub I/F Bridge (rev. 0x03)
agp0 at pchb0: using generic initialization for Intel AGP
agp0: aperture at 0xf8000000, size 0x4000000
ppb0 at pci0 dev 1 function 0: Intel 82845G/GL Host-to-AGP Bridge (rev. 0x03)
pci1 at ppb0 bus 1
pci1: i/o space, memory space enabled
[...]

The sample code provided in agp(4) man page give good results :

root@cluster3 [tmp/agp]# ./chkagp
version:        0.0
id:             25608086
mode:           1f000217
base:           f8000000
size:           64M
total mem:      112640
system mem:     112640
used mem:       0

alloc key 0, paddr 0
used mem now:   64

agp test successful


Index: agp_i810.c
===================================================================
RCS file: /cvsroot/src/sys/dev/pci/agp_i810.c,v
retrieving revision 1.20
diff -u -r1.20 agp_i810.c
--- agp_i810.c	2003/09/07 15:40:57	1.20
+++ agp_i810.c	2003/12/23 16:10:31
@@ -147,6 +147,7 @@
 		switch (PCI_PRODUCT(pa->pa_id)) {
 		case PCI_PRODUCT_INTEL_82840_HB:
 		case PCI_PRODUCT_INTEL_82865_HB:
+		case PCI_PRODUCT_INTEL_82845G_DRAM:
 			return agp_intel_attach(parent, self, aux);
 		}
 #endif
>Release-Note:
>Audit-Trail:
>Unformatted: