[coreboot] Re: DIY debug Dongle

[Nico Huber]

On 13.10.19 16:40, Tom Hiller wrote:
> The wiki briefly mentions "usb_debug_io.c" with a link to an old trac
> ticket.  Could a second device connected via usb only read the logs?  I
> am curious on the feasibility of attaching an Android phone/tablet with
> an app that could easily read coreboot debug information.

For EHCI debug, the basic requirements are that it's a high-speed
capable device and that you can configure and use it with <= 8 byte
transfers.

Usually this applies to Android devices and some have been used
already for debugging. You need the `g_dbgp` gadget driver. This
driver is reported to not always work, however... a workaround
could be to use `g_serial` and add some support code to the debug
target.

Nico