Updated version of Carl-Daniel Hailfinger's script for detecting USB EHCI debug ports

detect_ehci_debug_port.sh

#!/usr/bin/env bash

# Copyright 2008 Carl-Daniel Hailfinger
# Small fixes by Ivan Vatlin (C) 2021
# Original script: http://www.coreboot.org/pipermail/coreboot/attachments/20140530/245547f8/attachment.sh
# Link was taken from this article: https://www.coreboot.org/EHCI_Debug_Port

LANG=C
dmesgfile=$1
debug_lspci_devs=$(lspci -nvvD |
	grep -i "^[0-9a-f]\|debug port" |
	grep -iB1 --no-group-separator "debug port" |
	grep -vi "debug port" |
	cut -f 1 -d" " |
	sort |
	xargs echo)
test -z "$debug_lspci_devs" &&
	debug_lspci_devs="None"
echo "The following PCI devices support a USB debug port (says lspci): $debug_lspci_devs"
test "$debug_lspci_devs" = "None" &&
	echo "Possible reasons:
	+ lspci not run as root,
	+ lspci too old,
	+ USB controller does not support a debug device"
# shellcheck disable=SC2015
debug_dmesg_devs_with_port=$( (test -z "$dmesgfile" &&
	dmesg ||
	cat "$dmesgfile") |
	grep -i "ehci.*debug port" |
	sed "s/.* \([0-9a-f]*:*[0-9a-f]\{2\}:[0-9a-f]\{2\}\.[0-9a-f]\).*ebug port /\1 /" |
	sort
	)
debug_dmesg_devs=$(echo "$debug_dmesg_devs_with_port" |
	cut -f 1 -d" " |
	xargs echo
	)
test -z "$debug_dmesg_devs" && debug_dmesg_devs="None"
echo "The following PCI devices support a USB debug port (says the kernel): $debug_dmesg_devs"
test "$debug_dmesg_devs" = "None" && {
	echo "Possible reasons:
	+ dmesg scrolled off,
	+ kernel too old,
	+ USB controller does not support a debug device"
	test "$debug_lspci_devs" != "None" &&
		echo "You can specify a file containing kernel bootup messages as argument to this program"
	}
test "$debug_lspci_devs" != "$debug_dmesg_devs" && {
	echo "lspci and the kernel do not agree on USB debug device support. Exiting."
	exit 1
	}
test "$debug_dmesg_devs" = "None" && {
	echo "No USB controller with debug capability found"
	exit 1
	}
for dev in $debug_dmesg_devs; do
	bus=$(lsusb -v |
		grep "^Bus\|iSerial.*" |
		grep -B1 --no-group-separator "iSerial.*$dev" |
		grep "^Bus" |
		sed "s/Bus *0*\([0-9a-f]*\).*/\1/"
		)
	port=$(echo "$debug_dmesg_devs_with_port" |
		grep "^$dev" |
		cut -f 2 -d" "
		)
	echo "PCI device $dev, USB bus $bus, USB physical port $port"
	done
echo "Currently connected high-speed devices:"	
lsusb -t |
	grep 480M