[Linux-usb-users] ehci_hcd with slower FSB than normal (fwd)

Someone who knows about PCI and EHCI may be able to answer this...

It's odd that the enumeration fails partway through instead of right at 
the beginning.

Alan Stern

---------- Forwarded message ----------
Date: Sun, 04 Feb 2007 14:20:52 -0500
From: [email protected]
To: [email protected]
Subject: [Linux-usb-users] ehci_hcd with slower FSB than normal

I have a pc that I use as a VDR. In order to use less power and make it 
a little quiter I run
it with a lower FSB than I could. Normal is FSB 133 Mhz and I run it 
with 66 Mhz FSB.

The problem is that the ehci_hcd doesn't work with my FSB 66 Mhz.
No USB 2.0 memory stick and no USB 2.0 harddisk.
If I remove ehci_hcd it runs nicely with uhci_hcd, but slowly of course.

When I run it with FSB 66 Mhz I get:

kernel: usb 4-2: new high speed USB device using ehci_hcd and address 2
kernel: usb 4-2: no configurations
kernel: usb 4-2: can't read configurations, error -22

When I run it with FSB 133 Mhz I get:

kernel: usb 4-2: new high speed USB device using ehci_hcd and address 2
kernel: usb 4-2: configuration #1 chosen from 1 choice

When I boot into Windows USB seems to work nicely in FSB 66 so
it shouldn't be a hardware problem?

The processor is an AMD 2400+ XP.
Kernel:Fedora core 6 2.6.19-1.2895.fc6

Josce

My lcpci -v:

00:00.0 Host bridge: VIA Technologies, Inc. VT8377 [KT400/KT600 AGP] 
Host Bridge (rev 80)
        Subsystem: ASRock Incorporation K7VT6 motherboard
        Flags: bus master, 66MHz, medium devsel, latency 8
        Memory at e0000000 (32-bit, prefetchable) [size=64M]
        Capabilities: [80] AGP version 3.5
        Capabilities: [c0] Power Management version 2

00:01.0 PCI bridge: VIA Technologies, Inc. VT8237 PCI Bridge (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: dfe00000-dfefffff
        Prefetchable memory behind bridge: cfd00000-dfcfffff
        Capabilities: [80] Power Management version 2

00:0a.0 Multimedia controller: Philips Semiconductors SAA7146 (rev 01)
         Subsystem: Technotrend Systemtechnik GmbH Technotrend/Hauppauge 
DVB card rev2.1
        Flags: bus master, medium devsel, latency 32, IRQ 18
        Memory at dffffe00 (32-bit, non-prefetchable) [size=512]

00:0c.0 Ethernet controller: Atheros Communications, Inc. AR5212 
802.11abg NIC (rev 01)
        Subsystem: D-Link System Inc DWL-G520 Wireless PCI Adapter
        Flags: bus master, medium devsel, latency 168, IRQ 17
        Memory at dffe0000 (32-bit, non-prefetchable) [size=64K]
        Capabilities: [44] Power Management version 2

00:10.0 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: ASRock Incorporation K7VT6
        Flags: bus master, medium devsel, latency 32, IRQ 16
        I/O ports at e400 [size=32]
        Capabilities: [80] Power Management version 2

00:10.1 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: ASRock Incorporation K7VT6
        Flags: bus master, medium devsel, latency 32, IRQ 16
        I/O ports at e800 [size=32]
        Capabilities: [80] Power Management version 2

00:10.2 USB Controller: VIA Technologies, Inc. VT82xxxxx UHCI USB 1.1 
Controller (rev 80) (prog-if 00 [UHCI])
        Subsystem: ASRock Incorporation K7VT6
        Flags: bus master, medium devsel, latency 32, IRQ 16
        I/O ports at ec00 [size=32]
        Capabilities: [80] Power Management version 2

00:10.3 USB Controller: VIA Technologies, Inc. USB 2.0 (rev 82) 
(prog-if 20 [EHCI])
        Subsystem: ASRock Incorporation K7VT6 motherboard
        Flags: bus master, medium devsel, latency 32, IRQ 16
        Memory at dffffd00 (32-bit, non-prefetchable) [size=256]
        Capabilities: [80] Power Management version 2

00:11.0 ISA bridge: VIA Technologies, Inc. VT8235 ISA Bridge
        Subsystem: ASRock Incorporation K7VT2 motherboard
        Flags: bus master, stepping, medium devsel, latency 0
        Capabilities: [c0] Power Management version 2

00:11.1 IDE interface: VIA Technologies, Inc. 
VT82C586A/B/VT82C686/A/B/VT823x/A/C PIPC Bus Master IDE (rev 06) 
(prog-if 8a [Master SecP PriP])
        Subsystem: ASRock Incorporation K7VT2/K7VT6 motherboard
        Flags: bus master, medium devsel, latency 32, IRQ 255
        I/O ports at fc00 [size=16]
        Capabilities: [c0] Power Management version 2

00:11.5 Multimedia audio controller: VIA Technologies, Inc. 
VT8233/A/8235/8237 AC97 Audio Controller (rev 50)
        Subsystem: ASRock Incorporation K7VT6 motherboard
        Flags: medium devsel, IRQ 19
        I/O ports at e000 [size=256]
        Capabilities: [c0] Power Management version 2

01:00.0 VGA compatible controller: ATI Technologies Inc Radeon RV100 QY 
[Radeon 7000/VE] (prog-if 00 [VGA])
        Subsystem: Connect Components Ltd Radeon 7000 64MB DDR + DVI
         Flags: bus master, stepping, 66MHz, medium devsel, latency 32, 
IRQ 11
        Memory at d0000000 (32-bit, prefetchable) [size=128M]
        I/O ports at c800 [size=256]
        Memory at dfef0000 (32-bit, non-prefetchable) [size=64K]
        Expansion ROM at dfec0000 [disabled] [size=128K]
        Capabilities: [58] AGP version 2.0
        Capabilities: [50] Power Management version 2

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Get stuff done quickly with pre-integrated technology to make your job easier.
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