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
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@secunet.com] Sent: Wednesday, August 22, 2018 4:38 PM To: Hilbert Tu(杜睿哲_Pegatron); coreboot@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.
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Hilbert Tu(杜睿哲_Pegatron) -
Nico Huber