https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=238652
Bug ID: 238652
Summary: [USB] Timeout errors on boot with Intel ATOM cpus
Product: Base System
Version: 11.2-RELEASE
Hardware: amd64
OS: Any
Status: New
Severity: Affects Some People
Priority: ---
Component: usb
Assignee: [email protected]
Reporter: [email protected]
When booting a device using an Intel E3845 cpu, we see the following usb errors
in the dmesg:
[6] usbus1: port reset timeout
[6] uhub_reattach_port: port 1 reset failed, error=USB_ERR_TIMEOUT
[6] uhub_reattach_port: device problem (USB_ERR_TIMEOUT), disabling port 1
Although we receive those errors, usb ports are working as expexted.
In fact those errors comes from the EHCI driver, but the ports seems to be
using the XHCI one.
My guess is that the system try to attach both driver to the same device, since
the cpu does expose both interfaces (XHCI should be preferred, EHCI is exposed
mainly for compatibility reasons)
In order to check that I tried to force the XHCI mode in the BIOS, and this
made those errors disappears (the problem here being that we can't access the
BIOS from our customers), which seems to confirm my supposition.
How do you think we could address the problem?
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