I am guessing your question is to make the USB XHCI controller memory mapped
device instead of relying on the PCI IO protocol.
There were some discussions on the EDK2 mailing-list few years ago about
disconnecting the USB Host controller DXE driver from PCI IO driver.
The UEFI spec does not mandate to use USB Host controller over PCI Bus.
The idea was to create a new (UEFI) protocol that would abstract the hardware
transport protocol as we did for the VirtIo devices.
At the moment we are creating fake PCI bus to workaround this limitation. But
it is not the right approach.
Contributions are welcome!
From: Badola Nikhil [mailto:nikhil.bad...@freescale.com]
Sent: 29 June 2015 13:14
To: edk2-devel@lists.sourceforge.net
Subject: [edk2] Questions regarding XHCI
Could anyone please help me with below queries regarding USB XHCI controller as
platform device
rather than as PCI device :
- Has anyone tested USB stack for XHCI controller as platform device
after modifying exiting XhciDxe/* or
writing new host controller driver ?
- Which protocol would it consume in this case?
Regards,
Nikhil
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