Are we able to get something like console via EHCI debug port? Eg. to get traces etc. from laptops which do not include real serial console?
Some info from Coreboot page https://www.coreboot.org/EHCI_Debug_Port I see my Thinkpad T440s shows EHCI controller has 'Debug Port': # pcidump -v 0:29:0 0:29:0: Intel 8 Series USB 0x0000: Vendor ID: 8086 Product ID: 9c26 0x0004: Command: 0006 Status: 0290 0x0008: Class: 0c Subclass: 03 Interface: 20 Revision: 04 0x000c: BIST: 00 Header Type: 00 Latency Timer: 00 Cache Line Size: 00 0x0010: BAR mem 32bit addr: 0xf063d000/0x00000400 0x0014: BAR empty (00000000) 0x0018: BAR empty (00000000) 0x001c: BAR empty (00000000) 0x0020: BAR empty (00000000) 0x0024: BAR empty (00000000) 0x0028: Cardbus CIS: 00000000 0x002c: Subsystem Vendor ID: 17aa Product ID: 220c 0x0030: Expansion ROM Base Address: 00000000 0x0038: 00000000 0x003c: Interrupt Pin: 01 Line: 07 Min Gnt: 00 Max Lat: 00 0x0050: Capability 0x01: Power Management State: D0 0x0058: Capability 0x0a: Debug Port 0x0098: Capability 0x13: PCI Advanced Features j.
