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SubjectProblems with agpgart on MVP3

On a RedHat 7.0 stock kernel, agpgart finds the AGP aperture the first
time it's loaded, but if it's unloaded and reloaded, it gets confused
and seems to think the aperture is located at 0. At this point,
starting the Xserver (3.x or 4.x) or loading DRM drivers manually
freezes the system. SysRq doesn't work.

This is on an Epox MVPG3-M board (VIA MVP3 chipset) running an AMD
K6-2/400 and a Matrox G200 accelerator. I've tried this on RedHat
6.2's most recent kernel as well as a few 2.4.0-testX kernels, and the
result is readily reproducible on all versions of the
kernel. matroxfb/vesafb don't seem to affect this problem either way.

relevant dmesg output and lspci -v are attached.

Please cc: me, as I'm not subscribed to this list.

-ed

00:00.0 Host bridge: VIA Technologies, Inc. VT82C597 [Apollo VP3] (rev 04)
Flags: bus master, medium devsel, latency 16
Memory at e0000000 (32-bit, prefetchable)
Capabilities: [a0] AGP version 1.0

00:01.0 PCI bridge: VIA Technologies, Inc. VT82C598 [Apollo MVP3 AGP] (prog-if 00 [Normal decode])
Flags: bus master, 66Mhz, medium devsel, latency 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=0
I/O behind bridge: 0000c000-0000cfff
Memory behind bridge: e4000000-e7ffffff
Prefetchable memory behind bridge: e8000000-e8ffffff

00:07.0 ISA bridge: VIA Technologies, Inc. VT82C596 ISA [Apollo PRO] (rev 06)
Subsystem: VIA Technologies, Inc. VT82C596/A/B PCI to ISA Bridge
Flags: bus master, stepping, medium devsel, latency 0

00:07.1 IDE interface: VIA Technologies, Inc. VT82C586 IDE [Apollo] (rev 06) (prog-if 8a [Master SecP PriP])
Flags: bus master, medium devsel, latency 64
I/O ports at d000

00:07.2 USB Controller: VIA Technologies, Inc. VT82C586B USB (rev 02) (prog-if 00 [UHCI])
Subsystem: Unknown device 0925:1234
Flags: bus master, medium devsel, latency 64, IRQ 10
I/O ports at d400

00:07.3 Host bridge: VIA Technologies, Inc.: Unknown device 3050
Flags: medium devsel

00:08.0 SCSI storage controller: Initio Corporation 360P (rev 02)
Subsystem: Unknown device 9292:0202
Flags: bus master, medium devsel, latency 64, IRQ 11
I/O ports at d800
Memory at ea000000 (32-bit, non-prefetchable)
Expansion ROM at e9000000 [disabled]

00:0a.0 Multimedia audio controller: Ensoniq ES1371 [AudioPCI-97] (rev 06)
Subsystem: Ensoniq Creative Sound Blaster AudioPCI64V, AudioPCI128
Flags: bus master, slow devsel, latency 64, IRQ 12
I/O ports at dc00
Capabilities: [dc] Power Management version 1

00:0b.0 Ethernet controller: Realtek Semiconductor Co., Ltd. RTL-8029(AS)
Subsystem: Realtek Semiconductor Co., Ltd. RT8029(AS)
Flags: medium devsel, IRQ 5
I/O ports at e000

01:00.0 VGA compatible controller: Matrox Graphics, Inc. MGA G200 AGP (rev 01) (prog-if 00 [VGA])
Subsystem: Matrox Graphics, Inc. Millennium G200 AGP
Flags: bus master, medium devsel, latency 64, IRQ 11
Memory at e8000000 (32-bit, prefetchable)
Memory at e4000000 (32-bit, non-prefetchable)
Memory at e5000000 (32-bit, non-prefetchable)
Capabilities: [dc] Power Management version 1
Capabilities: [f0] AGP version 1.0

Linux version 2.2.16-22 (root@porky.devel.redhat.com) (gcc version egcs-2.91.66 19990314/Linux (egcs-1.1.2 release)) #1 Tue Aug 22 16:16:55 EDT 2000
Detected 400913 kHz processor.
ide_setup: ide0=dma
ide_setup: ide1=dma
Console: colour VGA+ 80x25
Calibrating delay loop... 799.54 BogoMIPS
Memory: 127376k/131072k available (1048k kernel code, 408k reserved, 1728k data, 64k init, 0k bigmem)
Dentry hash table entries: 262144 (order 9, 2048k)
Buffer cache hash table entries: 131072 (order 7, 512k)
Page cache hash table entries: 32768 (order 5, 128k)
VFS: Diskquotas version dquot_6.4.0 initialized
CPU: L1 I Cache: 32K L1 D Cache: 32K
CPU: AMD AMD-K6(tm) 3D processor stepping 0c
Checking 386/387 coupling... OK, FPU using exception 16 error reporting.
Checking 'hlt' instruction... OK.
POSIX conformance testing by UNIFIX
mtrr: v1.35a (19990819) Richard Gooch (rgooch@atnf.csiro.au)
PCI: PCI BIOS revision 2.10 entry at 0xfb4d0
PCI: Using configuration type 1
PCI: Probing PCI hardware
PCI: 00:38 [1106/0596]: Work around ISA DMA hangs (00)
Activating ISA DMA hang workarounds.
Linux NET4.0 for Linux 2.2
Based upon Swansea University Computer Society NET3.039
NET4: Unix domain sockets 1.0 for Linux NET4.0.
NET4: Linux TCP/IP 1.0 for NET4.0
IP Protocols: ICMP, UDP, TCP, IGMP
TCP: Hash tables configured (ehash 131072 bhash 65536)
Linux IP multicast router 0.06 plus PIM-SM
Initializing RT netlink socket
Starting kswapd v 1.5
Detected PS/2 Mouse Port.
Serial driver version 4.27 with MANY_PORTS MULTIPORT SHARE_IRQ enabled
ttyS00 at 0x03f8 (irq = 4) is a 16550A
ttyS01 at 0x02f8 (irq = 3) is a 16550A
pty: 256 Unix98 ptys configured
apm: BIOS version 1.2 Flags 0x07 (Driver version 1.13)
Real Time Clock Driver v1.09
RAM disk driver initialized: 16 RAM disks of 4096K size
VP_IDE: IDE controller on PCI bus 00 dev 39
VP_IDE: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA
ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:DMA, hdd:DMA
hda: IBM-DJNA-371350, ATA DISK drive
hdb: IBM-DTTA-371010, ATA DISK drive
hdd: CD-ROM CDU4011, ATAPI CDROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: IBM-DJNA-371350, 12949MB w/1966kB Cache, CHS=1650/255/63, UDMA
hdb: IBM-DTTA-371010, 9641MB w/465kB Cache, CHS=9795/32/63, UDMA
floppy0: no floppy controllers found
md driver 0.90.0 MAX_MD_DEVS=256, MAX_REAL=12
raid5: measuring checksumming speed
raid5: MMX detected, trying high-speed MMX checksum routines
pII_mmx : 872.490 MB/sec
p5_mmx : 761.238 MB/sec
8regs : 587.502 MB/sec
32regs : 408.051 MB/sec
using fastest function: pII_mmx (872.490 MB/sec)
scsi : 0 hosts.
scsi : detected total.
md.c: sizeof(mdp_super_t) = 4096
Partition check:
hda: hda1 hda2 < hda5 hda6 >
hdb: hdb1 hdb2 < hdb5 >
RAMDISK: Compressed image found at block 0
autodetecting RAID arrays
autorun ...
... autorun DONE.
VFS: Mounted root (ext2 filesystem).
i91u: PCI Base=0xD800, IRQ=11, BIOS=0xFF000, SCSI ID=7
i91u: Reset SCSI Bus ...
scsi0 : Initio INI-9X00U/UW SCSI device driver; Revision: 1.03g
scsi : 1 host.
Vendor: SEAGATE Model: ST31230W Rev: 0640
Type: Direct-Access ANSI SCSI revision: 02
Detected scsi disk sda at scsi0, channel 0, id 0, lun 0
Vendor: YAMAHA Model: CRW4416S Rev: 1.0g
Type: CD-ROM ANSI SCSI revision: 02
Detected scsi CD-ROM sr0 at scsi0, channel 0, id 1, lun 0
sr0: scsi3-mmc drive: 16x/16x writer cd/rw xa/form2 cdda tray
Uniform CD-ROM driver Revision: 3.10
SCSI device sda: hdwr sector= 512 bytes. Sectors= 2069860 [1010 MB] [1.0 GB]
sda: sda1 sda2
matroxfb: Matrox Millennium G200 (AGP) detected
matroxfb: MTRR's turned on
matroxfb: 640x480x8bpp (virtual: 640x13100)
matroxfb: framebuffer at 0xE8000000, mapped to 0xc881e000, size 8388608
Console: switching to colour frame buffer device 80x30
fb0: MATROX VGA frame buffer device
autodetecting RAID arrays
autorun ...
... autorun DONE.
VFS: Mounted root (ext2 filesystem) readonly.
change_root: old root has d_count=1
Trying to unmount old root ... okay
Freeing unused kernel memory: 64k freed
Adding Swap: 65832k swap-space (priority -1)
usb.c: registered new driver usbdevfs
usb.c: registered new driver hub
usb-uhci.c: $Revision: 1.232 $ time 16:21:43 Aug 22 2000
usb-uhci.c: High bandwidth mode enabled
usb-uhci.c: USB UHCI at I/O 0xd400, IRQ 10
usb-uhci.c: Detected 2 ports
usb.c: new USB bus registered, assigned bus number 1
usb.c: USB new device connect, assigned device number 1
hub.c: USB hub found
hub.c: 2 ports detected
usb.c: USB new device connect, assigned device number 2
usb.c: This device is not recognized by any installed USB driver.
hub.c: already running port 2 disabled by hub (EMI?), re-enabling...
usb.c: USB disconnect on device 2
usb.c: USB new device connect, assigned device number 2
usb.c: This device is not recognized by any installed USB driver.
usb.c: registered new driver hid
input0: USB HID v1.10 Mouse [Logitech USB Mouse] on usb1:2.0
mouse0: PS/2 mouse device for input0
mice: PS/2 mouse device common for all mice
es1371: version v0.22 time 16:21:06 Aug 22 2000
es1371: found chip, vendor id 0x1274 device id 0x1371 revision 0x06
es1371: found es1371 rev 6 at io 0xdc00 irq 12
es1371: features: joystick 0x0
es1371: codec vendor TRA (0x545241) revision 35 (0x23)
es1371: codec features none
es1371: stereo enhancement: no 3D stereo enhancement
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 96M
agpgart: Detected Via VP3 chipset
agpgart: AGP aperture is 64M @ 0xe0000000
ne2k-pci.c:vpre-1.00e 5/27/99 D. Becker/P. Gortmaker http://cesdis.gsfc.nasa.gov/linux/drivers/ne2k-pci.html
ne2k-pci.c: PCI NE2000 clone 'RealTek RTL-8029' at I/O 0xe000, IRQ 5.
eth0: RealTek RTL-8029 found at 0xe000, IRQ 5, 00:40:33:56:EF:F9.
mtrr: 0xe8000000,0x1000000 overlaps existing 0xe8000000,0x800000
[drm] AGP 0.99 on VIA VP3 @ 0xe0000000 64MB
[drm] Initialized mga 1.0.0 20000719 on minor 63
matroxfb: cannot set xres to 800, rounded up to 832
mtrr: 0xe8000000,0x1000000 overlaps existing 0xe8000000,0x800000
ISO 9660 Extensions: RRIP_1991A
mtrr: 0xe8000000,0x1000000 overlaps existing 0xe8000000,0x800000
[drm:mga_release] *ERROR* Process 4280 dead, freeing lock for context 1
[drm] Module unloaded
Linux agpgart interface v0.99 (c) Jeff Hartmann
agpgart: Maximum main memory to use for agp memory: 96M
agpgart: Detected Via VP3 chipset
agpgart: AGP aperture is 64M @ 0x0
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