Greetings everyone.
I have a peculiar problem with USB MIDI timing that appears beginning with
kernel 2.6.24, and still persists in 2.6.28.4. Kernel 2.6.23.17 works fine.
The symptom is some note events seem to arrive noticeably late. The problem
is most apparent with rapid scales or situations where multiple note events
are supposed to be played at once (chords).
The MIDI interface dongle I am using is only a full speed device.
The problem is _not_ present when connected directly to the root hub (the
MIDI dongle binds to the OHCI driver), and it is not present with
ehci_hcd unloaded or unbind'ed from the EHCI interface handling the bus
(forcing everything to use ohci), even when using external hubs.
The problem _is_ present when the MIDI dongle is connected to any
external USB 2.0 hub and EHCI is in use. I have reproduced on 2 different
hosts with two different EHCI chipsets (NVIDIA and ICH9) and about 4
different hubs. No EHCI setup with kernel >=2.6.24 works right. Not
knowing anything else, I would suspect the problem has something to do with
scheduling at the hub's TT.
Some background on the MIDI interfacing:
MIDI consists of a 7-bit serial data stream running at 38400 baud. The USB
midi driver simply takes the midi data stream and pushes it out via a bulk
transfer endpoint on the dongle, which in turn dumps the data out on the
MIDI line. MIDI data is real-time, and hence somewhat latency/jitter
sensitive, even though mechanisms are in place to align concurrent events
onto the same tick. In my case, alsa is getting it's timing via RTC.
Although I don't have an easy way to measure it, it sounds like some events
may be arriving around a 1/10 of a second late. The problem may also be
constrained to two URBs back to back or something similar.
I've reviewed the diffs between 2.6.23.17 and 2.6.24 for the ehci code but
it doesn't look like anything changed that would result in this problem. I
have also tried both settings for CONFIG_USB_EHCI_TT_NEWSCHED with at least
one 2.6.24* kernel build while I was trying to narrow down when the problem
was introduced. I'm also 64-bit (one AMD Athlon based system the other
Intel Core2 quad). If it becomes necessary to try this at 32-bit, I can
rebuild a box or something.
So, with that said, do you folks have any suggestions on where to look next?
Has anything changed that might affect the PCI side of things? Are there
any URB retry-like conditions that I can debug for? Any suggestions for
debugging timing?
I'm starting with this forum rather than the alsa forum as this problem
appears most related to the USB side, not the midi side. This only occurs
when using EHCI, and drivers aren't supposed to care about that. That being
said, I can happily take the question there, but they may just send me back
here. :-)
Thanks folks!
David
Here's an lsusb of my test setup (two external hubs chained between the midi
interface and the host), followed by an lspci.
Bus 002 Device 008: ID 0763:1002 Midiman
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 1.00
bDeviceClass 0 (Defined at Interface level)
bDeviceSubClass 0
bDeviceProtocol 0
bMaxPacketSize0 64
idVendor 0x0763 Midiman
idProduct 0x1002
bcdDevice 1.21
iManufacturer 0
iProduct 0
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 53
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xa0
(Bus Powered)
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 5
bInterfaceClass 255 Vendor Specific Class
bInterfaceSubClass 0
bInterfaceProtocol 0
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 1
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x82 EP 2 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x02 EP 2 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x84 EP 4 IN
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x04 EP 4 OUT
bmAttributes 2
Transfer Type Bulk
Synch Type None
Usage Type Data
wMaxPacketSize 0x0020 1x 32 bytes
bInterval 0
Device Status: 0x0000
(Bus Powered)
Bus 002 Device 007: ID 0409:0058 NEC Corp. HighSpeed Hub
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x0409 NEC Corp.
idProduct 0x0058 HighSpeed Hub
bcdDevice 1.00
iManufacturer 1 NEC Corporation
iProduct 2 USB2.0 Hub Controller
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x00a9
Per-port power switching
Per-port overcurrent protection
TT think time 16 FS bits
Port indicators
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0103 power enable connect
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
Bus 002 Device 006: ID 05e3:0608 Genesys Logic, Inc.
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x05e3 Genesys Logic, Inc.
idProduct 0x0608
bcdDevice 9.01
iManufacturer 0
iProduct 1 USB2.0 Hub
iSerial 0
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 100mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0001 1x 1 bytes
bInterval 12
Hub Descriptor:
bLength 9
bDescriptorType 41
nNbrPorts 4
wHubCharacteristic 0x00e0
Ganged power switching
Ganged overcurrent protection
TT think time 32 FS bits
Port indicators
bPwrOn2PwrGood 50 * 2 milli seconds
bHubContrCurrent 100 milli Ampere
DeviceRemovable 0x00
PortPwrCtrlMask 0xff
Hub Port Status:
Port 1: 0000.0503 highspeed power enable connect
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Device Qualifier (for other device speed):
bLength 10
bDescriptorType 6
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 0 Full speed hub
bMaxPacketSize0 64
bNumConfigurations 1
Device Status: 0x0001
Self Powered
Bus 002 Device 001: ID 0000:0000
Device Descriptor:
bLength 18
bDescriptorType 1
bcdUSB 2.00
bDeviceClass 9 Hub
bDeviceSubClass 0 Unused
bDeviceProtocol 1 Single TT
bMaxPacketSize0 64
idVendor 0x0000
idProduct 0x0000
bcdDevice 2.06
iManufacturer 3 Linux 2.6.24 ehci_hcd
iProduct 2 EHCI Host Controller
iSerial 1 0000:00:02.1
bNumConfigurations 1
Configuration Descriptor:
bLength 9
bDescriptorType 2
wTotalLength 25
bNumInterfaces 1
bConfigurationValue 1
iConfiguration 0
bmAttributes 0xe0
Self Powered
Remote Wakeup
MaxPower 0mA
Interface Descriptor:
bLength 9
bDescriptorType 4
bInterfaceNumber 0
bAlternateSetting 0
bNumEndpoints 1
bInterfaceClass 9 Hub
bInterfaceSubClass 0 Unused
bInterfaceProtocol 0 Full speed hub
iInterface 0
Endpoint Descriptor:
bLength 7
bDescriptorType 5
bEndpointAddress 0x81 EP 1 IN
bmAttributes 3
Transfer Type Interrupt
Synch Type None
Usage Type Data
wMaxPacketSize 0x0004 1x 4 bytes
bInterval 12
Hub Descriptor:
bLength 11
bDescriptorType 41
nNbrPorts 10
wHubCharacteristic 0x000a
No power switching (usb 1.0)
Per-port overcurrent protection
TT think time 8 FS bits
bPwrOn2PwrGood 10 * 2 milli seconds
bHubContrCurrent 0 milli Ampere
DeviceRemovable 0x00 0x00
PortPwrCtrlMask 0xff 0xff
Hub Port Status:
Port 1: 0000.0100 power
Port 2: 0000.0100 power
Port 3: 0000.0100 power
Port 4: 0000.0100 power
Port 5: 0000.0100 power
Port 6: 0000.0100 power
Port 7: 0000.0100 power
Port 8: 0000.0100 power
Port 9: 0000.0100 power
Port 10: 0000.0503 highspeed power enable connect
Device Status: 0x0003
Self Powered
Remote Wakeup Enabled
lspci -vv, fwiw:
00:00.0 RAM memory: nVidia Corporation MCP55 Memory Controller (rev a1)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Capabilities: <access denied>
00:01.0 ISA bridge: nVidia Corporation MCP55 LPC Bridge (rev a2)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem+ BusMaster+ SpecCycle+ MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
00:01.1 SMBus: nVidia Corporation MCP55 SMBus (rev a2)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Interrupt: pin A routed to IRQ 11
Region 4: I/O ports at 1c00 [size=64]
Region 5: I/O ports at 1c40 [size=64]
Capabilities: <access denied>
00:01.2 RAM memory: nVidia Corporation MCP55 Memory Controller (rev a2)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
00:02.0 USB Controller: nVidia Corporation MCP55 USB Controller (rev a1) (prog-if 10 [OHCI])
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (750ns min, 250ns max)
Interrupt: pin A routed to IRQ 23
Region 0: Memory at fe02f000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:02.1 USB Controller: nVidia Corporation MCP55 USB Controller (rev a2) (prog-if 20 [EHCI])
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (750ns min, 250ns max)
Interrupt: pin B routed to IRQ 22
Region 0: Memory at fe02e000 (32-bit, non-prefetchable) [size=256]
Capabilities: <access denied>
00:04.0 IDE interface: nVidia Corporation MCP55 IDE (rev a1) (prog-if 8a [Master SecP PriP])
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem- BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (750ns min, 250ns max)
Region 0: [virtual] Memory at 000001f0 (32-bit, non-prefetchable) [disabled] [size=8]
Region 1: [virtual] Memory at 000003f0 (type 3, non-prefetchable) [disabled] [size=1]
Region 2: [virtual] Memory at 00000170 (32-bit, non-prefetchable) [disabled] [size=8]
Region 3: [virtual] Memory at 00000370 (type 3, non-prefetchable) [disabled] [size=1]
Region 4: I/O ports at f400 [size=16]
Capabilities: <access denied>
00:05.0 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2) (prog-if 85 [Master SecO PriO])
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (750ns min, 250ns max)
Interrupt: pin A routed to IRQ 20
Region 0: I/O ports at 09f0 [size=8]
Region 1: I/O ports at 0bf0 [size=4]
Region 2: I/O ports at 0970 [size=8]
Region 3: I/O ports at 0b70 [size=4]
Region 4: I/O ports at e000 [size=16]
Region 5: Memory at fe02d000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:05.1 IDE interface: nVidia Corporation MCP55 SATA Controller (rev a2) (prog-if 85 [Master SecO PriO])
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (750ns min, 250ns max)
Interrupt: pin B routed to IRQ 23
Region 0: I/O ports at 09e0 [size=8]
Region 1: I/O ports at 0be0 [size=4]
Region 2: I/O ports at 0960 [size=8]
Region 3: I/O ports at 0b60 [size=4]
Region 4: I/O ports at cc00 [size=16]
Region 5: Memory at fe02c000 (32-bit, non-prefetchable) [size=4K]
Capabilities: <access denied>
00:06.0 PCI bridge: nVidia Corporation MCP55 PCI bridge (rev a2) (prog-if 01 [Subtractive decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR+ FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0
Bus: primary=00, secondary=01, subordinate=01, sec-latency=32
I/O behind bridge: 0000b000-0000bfff
Memory behind bridge: fde00000-fdefffff
Prefetchable memory behind bridge: fdd00000-fddfffff
Secondary status: 66MHz- FastB2B+ ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA+ VGA- MAbort- >Reset- FastB2B-
Capabilities: <access denied>
00:06.1 Audio device: nVidia Corporation MCP55 High Definition Audio (rev a2)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O- Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (500ns min, 1250ns max)
Interrupt: pin B routed to IRQ 11
Region 0: Memory at fe024000 (32-bit, non-prefetchable) [size=16K]
Capabilities: <access denied>
00:08.0 Bridge: nVidia Corporation MCP55 Ethernet (rev a2)
Subsystem: Holco Enterprise Co, Ltd/Shuttle Computer Unknown device 3077
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz+ UDF- FastB2B+ ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0 (250ns min, 5000ns max)
Interrupt: pin A routed to IRQ 510
Region 0: Memory at fe02b000 (32-bit, non-prefetchable) [size=4K]
Region 1: I/O ports at c800 [size=8]
Region 2: Memory at fe02a000 (32-bit, non-prefetchable) [size=256]
Region 3: Memory at fe029000 (32-bit, non-prefetchable) [size=16]
Capabilities: <access denied>
00:0f.0 PCI bridge: nVidia Corporation MCP55 PCI Express bridge (rev a2) (prog-if 00 [Normal decode])
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 64 bytes
Bus: primary=00, secondary=02, subordinate=02, sec-latency=0
I/O behind bridge: 0000a000-0000afff
Memory behind bridge: fa000000-fcffffff
Prefetchable memory behind bridge: 00000000e0000000-00000000efffffff
Secondary status: 66MHz- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- <SERR- <PERR-
BridgeCtl: Parity- SERR- NoISA+ VGA+ MAbort- >Reset- FastB2B-
Capabilities: <access denied>
00:18.0 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] HyperTransport Technology Configuration
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Capabilities: <access denied>
00:18.1 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Address Map
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
00:18.2 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] DRAM Controller
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap- 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
00:18.3 Host bridge: Advanced Micro Devices [AMD] K8 [Athlon64/Opteron] Miscellaneous Control
Control: I/O- Mem- BusMaster- SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Capabilities: <access denied>
01:08.0 FireWire (IEEE 1394): VIA Technologies, Inc. IEEE 1394 Host Controller (rev 80) (prog-if 10 [OHCI])
Subsystem: VIA Technologies, Inc. IEEE 1394 Host Controller
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping+ SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=medium >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 64 (8000ns max), Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 16
Region 0: Memory at fdeff000 (32-bit, non-prefetchable) [size=2K]
Region 1: I/O ports at bc00 [size=128]
Capabilities: <access denied>
02:00.0 VGA compatible controller: nVidia Corporation G72 [GeForce 7300 SE] (rev a1) (prog-if 00 [VGA])
Subsystem: eVga.com. Corp. Unknown device c429
Control: I/O+ Mem+ BusMaster+ SpecCycle- MemWINV- VGASnoop- ParErr- Stepping- SERR- FastB2B-
Status: Cap+ 66MHz- UDF- FastB2B- ParErr- DEVSEL=fast >TAbort- <TAbort- <MAbort- >SERR- <PERR-
Latency: 0, Cache Line Size: 64 bytes
Interrupt: pin A routed to IRQ 5
Region 0: Memory at fa000000 (32-bit, non-prefetchable) [size=16M]
Region 1: Memory at e0000000 (64-bit, prefetchable) [size=256M]
Region 3: Memory at fb000000 (64-bit, non-prefetchable) [size=16M]
[virtual] Expansion ROM at fc000000 [disabled] [size=128K]
Capabilities: <access denied>
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