[coreboot] USB cannot work

Nico Huber nico.huber at secunet.com
Tue Aug 21 12:48:45 CEST 2018

Hello Hilbert,

Am 21.08.18 um 12:09 schrieb Hilbert Tu(杜睿哲_Pegatron):
> From BWG(BIOS Write Guide), there are two steps needed to be done for USB to work:
> 1.      Pre-Operating Software Initialization
> 2.      EHCI Initialization for Pre-OS Software Usage
> Does anyone know where these steps are implemented in Coreboot?
> Thanks.

I don't but my educated guess is:

1. In FSP.

2. Your payload.

Though, there is a pitfall I guess. If the public datasheet for Den-
verton is correct, there is *no* EHCI. And this might be your actual
problem: If you only have an xHCI controller, it doesn't work with GRUB
simply because GRUB doesn't have a driver for xHCI. AFAIK, nobody wrote
one yet.

> -Hilbert
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This footer makes absolutely no sense when you address a mailing list. I
wouldn't be surprised if you get less answers because of it.

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