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| author | eric_tian <eric_tian@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-08-11 05:55:14 +0000 |
|---|---|---|
| committer | eric_tian <eric_tian@6f19259b-4bc3-4df7-8a09-765794883524> | 2009-08-11 05:55:14 +0000 |
| commit | ba19956ac3c600eaeff1c90556457105032218d8 (patch) | |
| tree | d42ca673ba325c5c627456f75003d4633f3029bf /MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf | |
| parent | 488899900894e3c2a9e581cb2d1eec0d3761296b (diff) | |
| download | edk2-ba19956ac3c600eaeff1c90556457105032218d8.tar.gz edk2-ba19956ac3c600eaeff1c90556457105032218d8.tar.bz2 edk2-ba19956ac3c600eaeff1c90556457105032218d8.zip | |
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.
git-svn-id: https://edk2.svn.sourceforge.net/svnroot/edk2/trunk/edk2@9040 6f19259b-4bc3-4df7-8a09-765794883524
Diffstat (limited to 'MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf')
| -rw-r--r-- | MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf b/MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf index fd98e4200f..381f4bd400 100644 --- a/MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf +++ b/MdeModulePkg/Bus/Pci/EhciDxe/EhciDxe.inf @@ -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
|