Follow-up Comment #3, bug #47406 (project grub):
detect_dev is called for every port constantly and its purpose is to detect if
new devices are connected and it's lightweight if none is. "Oscilating" is
because it actually shows status for different ports. It's piossible that
ohci.mod is culprit as it's less tested that ehci for coreboot, hence I ask to
remove it from mkrescue command line. Make sure that all connected devices are
either USB 2.0 or later or connect through a hub
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