[bug #47406] GRUB2 detects constant addition of nonexistent USB devices

[Timothy Pearson]

Follow-up Comment #2, bug #47406 (project grub):

I am not familiar with GRUB's code, however those messages should only be
printed if the grub_ohci_detect_dev function is being called repeatedly.  Am I
misunderstanding the purpose of that function?

Decoding the flags reveals the status register is changing between:

OHCI_CTRL_IR

and

OHCI_CTRL_CBSR
OHCI_CTRL_IR
OHCI_CTRL_RWC

I am not familiar with the details of OHCI operation.  Is this normal /
expected behavior when no USB devices are attached?

If there is anything I should provide to debug the user-visible problem
(namely severe USB keyboard input lag and extremely slow USB boot) please let
me know.

Thanks!

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