[coreboot] USB cannot work

Sumo kingsumos at gmail.com
Wed Aug 22 16:05:23 CEST 2018

USB works a charm using CorebootPayloadPkg from Tianocore/EDK2 instead of
using GRUB2 as payload (you can use grub anyway to load linux later on, or
use any other bootloader without sticking this in the SPI flash image).

Em qua, 22 de ago de 2018 às 07:45, Hilbert Tu(杜睿哲_Pegatron) <
Hilbert_Tu at pegatroncorp.com> escreveu:

> Hi Nico,
> Confused.
> 1. I saw " pch: usb_xhci_init" in the boot up log and I think xHCI
> controller was initialized by coreboot
> 2. I have used coreboot with grub for Intel Rangeley and BDX-DE platform,
> the USB interface were working with xHCI controller. That means grub has
> its own xHCI driver.
> 3. I am trying u-boot as payload now.
> Sorry I really don't well understand coreboot and grub :P
> -Hilbert
> -----Original Message-----
> From: Nico Huber [mailto:nico.huber at secunet.com]
> Sent: Wednesday, August 22, 2018 4:38 PM
> To: Hilbert Tu(杜睿哲_Pegatron); coreboot at coreboot.org
> Subject: Re: [coreboot] USB cannot work
> Hi Hilbert,
> Am 22.08.18 um 03:24 schrieb Hilbert Tu(杜睿哲_Pegatron):
> > Maybe you are right. But as I know, CRB Harcuvar is one of supported
> > board of Coreboot and it includes xHCI controller and USB interfaces.
> Harcuvar is indeed supported by coreboot. But coreboot only initializes
> the hardware up to a point where an OS or bootloader can use it. The OS
> or bootloader still needs its own driver for the hardware. This is very
> different as in the legacy BIOS/UEFI case (a BIOS would provide a driver
> but coreboot doesn't).
> So if you want to use GRUB as a coreboot payload and use USB, GRUB needs
> its own driver for the xHCI. I would first try to confirm if or if not
> the xHCI works with other payloads (e.g. SeaBIOS, Tianocore, libpayload
> based) or an OS.
> Nico
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