[haiku-bugs] Re: [Haiku] #11146: Support EHCI keyboard in KDL.
- From: "pulkomandy" <trac@xxxxxxxxxxxx>
- Date: Wed, 20 Aug 2014 20:22:09 -0000
#11146: Support EHCI keyboard in KDL.
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Reporter: pulkomandy | Owner: axeld
Type: enhancement | Status: new
Priority: normal | Milestone: Unscheduled
Component: System/Kernel | Version: R1/Development
Resolution: | Keywords:
Blocked By: | Blocking:
Has a Patch: 0 | Platform: All
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Description changed by pulkomandy:
Old description:
> Until now USB2 (EHCI) used "companion controllers", either UHCI or OHCI,
> to manage USB1 devices. Not anymore.
>
> Modern hardware uses a "rate managing hub" instead, which basically means
> the EHCI controller now handles USB1 devices directly. On such machines
> listusb shows no UHCI/OHCI hubs at all.
>
> This works fine, except in the kernel debugger which currently peeks
> directly into the UHCI driver to get USB keyboards working. Now we also
> need to do this with EHCI. Until we do, some people can't use their
> keyboard in KDL, which is a problem for debugging other issues.
New description:
Until now USB2 (EHCI) used "companion controllers", either UHCI or OHCI,
to manage USB1 devices. Not anymore.
Modern hardware uses a "rate matching hub" instead, which basically means
the EHCI controller now handles USB1 devices directly. On such machines
listusb shows no UHCI/OHCI hubs at all.
This works fine, except in the kernel debugger which currently peeks
directly into the UHCI driver to get USB keyboards working. Now we also
need to do this with EHCI. Until we do, some people can't use their
keyboard in KDL, which is a problem for debugging other issues.
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Ticket URL: <https://dev.haiku-os.org/ticket/11146#comment:2>
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