Re: uhci_hcd ohci_hcd ehci_hcd

Jean-David Beyer <jeandavid8@xxxxxxxxxxx>:

You probably need this:

http://www.linux-usb.org/FAQ.html

uhci is 1.0 and ehci is usb 2.0? I've never heard of ohci. Sorry for
the top post, but the following is more pertinent than my comments.

I run RHEL 5 on my machine. The motherboard has three USB 1.1 controllers on
it and I wanted some USB 2 controllers, so I put in a StarTech.com 6 Port
USB 2.0 PIC Card in it PCI625USB2I. This board has 4 external USB connectors
and 2 internal USB connectors. Nothing is plugged into any of these USB
connectors at the moment.

/proc/interrupts reveals:

169: 0 0 0 0 IO-APIC-level uhci_hcd:usb3
177: 0 0 0 0 IO-APIC-level uhci_hcd:usb1
185: 0 0 0 0 IO-APIC-level uhci_hcd:usb2
193: 0 0 0 0 IO-APIC-level ohci_hcd:usb4
201: 0 0 0 0 IO-APIC-level ohci_hcd:usb5
209: 0 0 0 0 IO-APIC-level ohci_hcd:usb6
217: 0 0 0 0 IO-APIC-level ehci_hcd:usb7

The ones listed as uhci_hcd were the original USB 1.1 controllers. Two of
them have two USB connectors each. One has just one.

The ones listed as ohci_hcd and ehci_hcd appeared when I plugged in the new
card -- I believe.

1.) I do not know what the uhci, ohci, and ehci stand for.

2.) Why are only 4 new USB controllers listed instead of six? Could there be
four controllers, two of which have two connectors? Which are which? I could
not tell from the StarTech web site.

3.) Why are the new USB controllers not all listed as the same type?

/sbin/lspci reveals that, among other things, the following modules have
been loaded. It would seem to reflect the above:

ehci_hcd 33229 0
ohci_hcd 23389 0
uhci_hcd 25549 0

/sbin/lspci -v reveals:

00:1d.0 USB Controller: Intel Corporation 82801CA/CAM USB Controller #1 (rev
02) (prog-if 00 [UHCI])
Subsystem: Super Micro Computer Inc P4DP6
Flags: bus master, medium devsel, latency 0, IRQ 177
I/O ports at 2000 [size=32]

00:1d.1 USB Controller: Intel Corporation 82801CA/CAM USB Controller #2 (rev
02) (prog-if 00 [UHCI])
Subsystem: Super Micro Computer Inc P4DP6
Flags: bus master, medium devsel, latency 0, IRQ 185
I/O ports at 2020 [size=32]

00:1d.2 USB Controller: Intel Corporation 82801CA/CAM USB Controller #3 (rev
02) (prog-if 00 [UHCI])
Subsystem: Super Micro Computer Inc P4DP6
Flags: bus master, medium devsel, latency 0, IRQ 169
I/O ports at 2040 [size=32]

05:03.0 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if
10 [OHCI])
Subsystem: ALi Corporation ASRock 939Dual-SATA2 Motherboard
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 193
Memory at fc401000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [60] Power Management version 2

05:03.1 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if
10 [OHCI])
Subsystem: ALi Corporation ASRock 939Dual-SATA2 Motherboard
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 201
Memory at fc402000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [60] Power Management version 2

05:03.2 USB Controller: ALi Corporation USB 1.1 Controller (rev 03) (prog-if
10 [OHCI])
Subsystem: ALi Corporation ASRock 939Dual-SATA2 Motherboard
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 209
Memory at fc403000 (32-bit, non-prefetchable) [size=4K]
Capabilities: [60] Power Management version 2

05:03.3 USB Controller: ALi Corporation USB 2.0 Controller (rev 01) (prog-if
20 [EHCI])
Subsystem: Unknown device 2020:8888
Flags: bus master, 66MHz, medium devsel, latency 64, IRQ 217
Memory at fc404000 (32-bit, non-prefetchable) [size=256]
Capabilities: [50] Power Management version 2
Capabilities: [58] Debug port

The 00:01 controllers are the old USB 1.1 controllers.
I infer the 05:03 controllers are 4 of the new USB 2.0 controllers. Are
there just four? (I do not intend to ever use the two internal connectors.

4.) Why are three of them misidentified as USB 1.1 controllers? Would
StarTech really have made such a thing? Is it a bug in the kernel that
misidentifies them? Will they all work as 2.0 USP controllers?



--
Any technology distinguishable from magic is insufficiently advanced.
(*) http://blinkynet.net/comp/uip5.html Linux Counter #80292
- - http://www.faqs.org/rfcs/rfc1855.html Please, don't Cc: me.
.

Relevant Pages

  • The case of the missing USB controllers
    ... The machine has several USB controllers and FreeBSD ... I have the verbose dmesg output for a successful boot here: ...
    (freebsd-current)
  • Re: Active home pro stopped working II
    ... is just plugging the cm15a to a different USB port on your PC. ... Tim Dolan wrote: ... All my x10 lights etc work via the hand held controllers and the plug in controllers. ...
    (comp.home.automation)
  • Re: Cant Find Root Hubs
    ... [[In Device Manager, USB game controllers are listed under Human Interface ... If you do not see USB Root Hub, ...
    (microsoft.public.windowsxp.help_and_support)
  • uhci_hcd ohci_hcd ehci_hcd
    ... it and I wanted some USB 2 controllers, so I put in a StarTech.com 6 Port ... bus master, medium devsel, latency 0, IRQ 177 ...
    (linux.redhat.misc)
  • Re: uhci_hcd ohci_hcd ehci_hcd
    ... uhci is 1.0 and ehci is usb 2.0? ... Most controllers on Intel or Via chipsets use UHCI. ... bus master, medium devsel, latency 0, IRQ 177 ...
    (linux.redhat.misc)