[coreboot] Re: Debugging EHCI - but Pre-CBMEM romstage/ramstage console overflowed, log truncated

[Mike Banon]

Thank you very much for your reply. Still curious about this
"Pre-CBMEM log truncated" issue - how would you have solved it?

On Sun, Oct 27, 2019 at 10:08 AM Kyösti Mälkki  wrote:
> On Sun, Oct 27, 2019 at 8:53 AM Mike Banon  wrote:
> > Good day, I'm researching if it's possible to support a cheaper
> > FT232BL-based EHCI usbdebug dongle like the already-supported FT232H
> > -- to make EHCI debugging more accessible to the newcoming
> > coreboot'ers -- and need the detailed logs (i.e.
> > CONFIG_DEBUG_CONSOLE_INIT) to figure this out.
>
> EHCI debug mode requires USB 2.0 High Speed (480 Mbps) device which
> FT232BL is not. That hardware can possibly provide console with GRUB
> payload but nothing earlier than that.
>
> Kyösti