[coreboot] Contribute: USB debug port info

[Fred .]

$ lspci|grep EHCI|cut -f1 -d' '
00:1a.7
00:1d.7

$ sudo lspci -vs 00:1a.7
00:1a.7 USB Controller: Intel Corporation 82801JI (ICH10 Family) USB2
EHCI Controller #2 (prog-if 20 [EHCI])
	Subsystem: Giga-byte Technology GA-EP45-DS5 Motherboard
	Flags: bus master, medium devsel, latency 0, IRQ 18
	Memory at fdfff000 (32-bit, non-prefetchable) [size=1K]
	Capabilities: [50] Power Management version 2
	Kernel driver in use: ehci_hcd

$ sudo lspci -ns 00:1a.7
00:1a.7 0c03: 8086:3a3c

$ sudo ./attachment.sh
The following PCI devices support a USB debug port (says lspci): None
Possible reasons: lspci not run as root, lspci too old, USB controller
does not support a debug device
The following PCI devices support a USB debug port (says the kernel): None
Possible reasons: dmesg scrolled off, kernel too old, USB controller
does not support a debug device
No USB controller with debug capability found

http://www.coreboot.org/EHCI_Debug_Port