32 lines
1.3 KiB
Bash
Executable File
32 lines
1.3 KiB
Bash
Executable File
#!/bin/sh
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## Some XHCI USB controllers, like on a 2015 MacBook Air, will not be properly
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## reinitialized after ZFSBootMenu jumps into the system kernel with kexec; no
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## USB devices will be enumerated, so e.g., keyboards will not function.
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##
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## One way to work around this is to just blacklist USB modules in ZFSBootMenu,
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## but this prevents keyboard interaction in the boot menu. A better
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## alternative is to try unbinding all USB controllers from xhci_hcd
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## immediately before jumping into the new kernel, which allows the new kernel
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## to properly initialize the USB subsystem.
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##
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## This could be adapted to other drivers, including {O,U,E}HCI as necessary.
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##
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## To use, put this script somewhere, make sure it is executable, and add the
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## path to the `zfsbootmenu_teardown` space-separated list with, e.g.,
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##
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## zfsbootmenu_teardown+=" <path to script> "
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##
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## in a dracut.conf(5) file inside the directory specified for the option
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## `Global.DracutConfDir` in the ZFSBootMenu `config.yaml`.
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SYS_XHCI=/sys/bus/pci/drivers/xhci_hcd
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# shellcheck disable=SC2231
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for DEVPATH in ${SYS_XHCI}/????:??:??.?; do
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[ -L "${DEVPATH}" ] || continue
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DEVICE="${DEVPATH#"${SYS_XHCI}"/}"
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echo "Tearing down USB controller ${DEVICE}..."
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echo "${DEVICE}" > ${SYS_XHCI}/unbind
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done
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