bug in Linux 2.4.19RC1 i815e agpgart module, unable to determine aperture size.

I think I have found a bug in agpgart code in Linux. To replicate this error boot into linux in text mode. Modeprobe agpgart and get this message. Agpgart work flawless with Linux 2.4.19-pre10 and all other 2.4.X kernels. You may notice that I have Nvidia Geforce but NVdriver was not loaded when I tried to load agpgart, and the kernel was untainted. Please CC me in your reply since I do not subscribe to lkml.

/lib/modules/2.4.19-rc1-xfs/kernel/drivers/char/agp/agpgart.o:
init_module: Invalid argument /lib/modules/2.4.19-rc1-xfs/kernel/drivers/char/agp/agpgart.o: insmod /lib/modules/2.4.19-rc1-xfs/kernel/drivers/char/agp/agpgart.o failed /lib/modules/2.4.19-rc1-xfs/kernel/drivers/char/agp/agpgart.o: insmod agpgart failed
Hint: insmod errors can be caused by incorrect module parameters, including invalid IO or IRQ parameters

Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 203M
agpgart: Detected Intel i815 chipset
agpgart: unable to determine aperture size.

00:00.0 Host bridge: Intel Corp. 82815 815 Chipset Host Bridge and Memory Controller Hub (rev 02)
00:01.0 PCI bridge: Intel Corp. 82815 815 Chipset AGP Bridge (rev 02) 00:1e.0 PCI bridge: Intel Corp. 82801BA/CA PCI Bridge (rev 02) 00:1f.0 ISA bridge: Intel Corp. 82801BA ISA Bridge (LPC) (rev 02) 00:1f.1 IDE interface: Intel Corp. 82801BA IDE U100 (rev 02) 00:1f.2 USB Controller: Intel Corp. 82801BA/BAM USB (Hub (rev 02) 00:1f.3 SMBus: Intel Corp. 82801BA/BAM SMBus (rev 02) 01:00.0 VGA compatible controller: nVidia Corporation NV15 [GeForce2 GTS] (rev a4)
02:0a.0 Ethernet controller: 3Com Corporation 3c905B 100BaseTX [Cyclone] (rev 30)
02:0c.0 Multimedia audio controller: Creative Labs SB Live! EMU10k1 (rev
07)
02:0c.1 Input device controller: Creative Labs SB Live! MIDI/Game Port (rev 07)

cat /proc/modules

ide-scsi                9344   0
scsi_mod              101496   1 [ide-scsi]
ide-cd                 30368   0
cdrom                  32000   0 [ide-cd]
nls_iso8859-1           3520   1 (autoclean)
nls_cp437               5152   1 (autoclean)
vfat                   11516   1 (autoclean)
fat                    36728   0 (autoclean) [vfat]
ext3                   63744   2 (autoclean)
jbd                    46672   2 (autoclean) [ext3]
usb-uhci               24420   0 (unused)
usbcore                71328   1 [usb-uhci]

Since -rc1 agpgart_be.c uses for the 815 new 815-specific instead of the generic intel functions.

Could you try whether reverting the following part of the patch fixes the problem?

@@ -3929,7 +4005,7 @@
 		INTEL_I815,
 		"Intel",
 		"i815",
-		intel_generic_setup },
+		intel_815_setup },
 	{ PCI_DEVICE_ID_INTEL_820_0,
 		PCI_VENDOR_ID_INTEL,
 		INTEL_I820,

cu
Adrian

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