Re: Support for serial console on legacy free machines

From: Khalid Aziz (
Date: Mon Jul 30 2001 - 14:39:24 EST

Rik van Riel wrote:
> On Thu, 26 Jul 2001, Khalid Aziz wrote:
> > serial console. The bummer is this table was designed by Microsoft and
> > Microsoft owns the copyright on it. Microsoft primarily designed this
> Microsoft owns the copyright on that particular document.
> If I were to give you an mp3 with descriptions of what
> various bits to poke at you'd be free to do whatever you
> want with that info ;)
> In fact, I suspect you're already free to do whatever
> you want with the info contained in the document...

You are possibly right. It would be better to use SPCR as opposed to
another equivalent table since every vendor is extremely likely to
include SPCR in their ACPI implementation in the firmware since
Microsoft would require it, which may not be the case with another
table. If everyone feels there is no problem with using SPCR as it is,
then I can release the code I have already done to support it. One thing
I should point out is since Microsoft owns the definition for SPCR (same
applies to DBGP which defines a Debug serial port), they can easily
change the defitnition of the table and Linux will have to play catch
up, although that situation would be nothing new.

Here is an excerpt from the disclaimer in the table description document
for anyone interested:

"Disclaimer: The information contained in this document represents the
current view of Microsoft Corporation on the issues discussed as of the
date of publication. Because Microsoft must respond to changing market
conditions, it should not be interpreted to be a commitment on the part
of Microsoft, and Microsoft cannot guarantee the accuracy of any
information presented. This document is for informational purposes only.

Microsoft Corporation may have patents or pending patent applications,
trademarks, copyrights, or other intellectual property rights covering
subject matter in this document. The furnishing of this document does
not give you any license to the patents, trademarks, copyrights, or
other intellectual property rights except as expressly provided in any
written license agreement from Microsoft Corporation.

Microsoft does not make any representation or warranty regarding
specifications in this document or any product or item developed based
on these specifications. Microsoft disclaims all express and implied
warranties, including but not limited to the implied warranties or
merchantability, fitness for a particular purpose and freedom from
infringement. Without limiting the generality of the foregoing,
Microsoft does not make any warranty of any kind that any item
developed based on these specifications, or any portion of a
specification, will not infringe any copyright, patent, trade secret or
other intellectual property right of any person or entity in any
country. It is your responsibility to seek licenses for such
intellectual property rights where appropriate. Microsoft shall not be
liable for any damages arising out of or in connection with the use of
these specifications, including liability for lost profit, business
interruption, or any other damages whatsoever."

Khalid Aziz                              Linux Systems Operation R&D
(970)898-9214                                        Hewlett-Packard                                    Fort Collins, CO
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This archive was generated by hypermail 2b29 : Tue Jul 31 2001 - 21:00:45 EST