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add comments to clarify the enhancement on EHCI driver, which is guaranteed to get attached to EHCI host controller before UHCI driver attaches to uhci host controller.

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git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9040 6f19259b-4bc3-4df7-8a09-765794883524
This commit is contained in:
eric_tian
2009-08-11 05:55:14 +00:00
parent 4888999008
commit ba19956ac3
2 changed files with 27 additions and 3 deletions
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5
MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf
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@@ -6,6 +6,11 @@
# It implements the interfaces of monitoring the status of all ports and transferring
# Control, Bulk, Interrupt and Isochronous requests to Usb2.0 device.
#
# Note that EhciDxe driver is enhanced to guarantee that the EHCI controller get attached
# to the EHCI controller before the UHCI driver attaches to the companion UHCI controller.
# This way avoids the control transfer on a shared port between EHCI and companion host
# controller when UHCI gets attached earlier than EHCI and a USB 2.0 device inserts.
#
# Copyright (c) 2006 - 2009, Intel Corporation.
#
# All rights reserved. This program and the accompanying materials