Re: [linux-kernel] Re: [PATCH] x86: provide a DMI based port 0x80 I/O delay override.

On Tuesday 08 January 2008 18:24:02 David P. Reed wrote:
Windows these days does delays with timing loops or the scheduler. It
doesn't use a "port". Also, Windows XP only supports machines that tend
not to have timing problems that use delays. Instead, if a device takes
a while to respond, it has a "busy bit" in some port or memory slot that
can be tested.

Windows XP can run on a machine with ISA slot(s) and has built-in drivers for
some plug&play ISA cards - e.g. the famous 3Com EtherLink III. I think that
there's a driver for NE2000-compatible cards too and it probably works.

Almost all of the issues in Linux where _p operations are used are (or
should be) historical - IMO.

Ondrej Zary wrote:
On Tuesday 08 January 2008 02:38:15 David P. Reed wrote:
H. Peter Anvin wrote:
And shoot the designer of this particular microcontroller firmware.

Well, some days I want to shoot the "designer" of the entire Wintel
architecture... it's not exactly "designed" by anybody of course, and
today it's created largely by a collection of Taiwanese and Chinese ODM
firms, coupled with Microsoft WinHEC and Intel folks. At least they
follow the rules and their ACPI and BIOS code say that they are using
port 80 very clearly if you use PnP and ACPI properly. And in the old
days, you were "supposed" to use the system BIOS to talk to things like
the PIT that had timing issues, not write your own code.

Does anyone know what port does Windows use? I'm pretty sure that it
isn't 80h as I run Windows 98 often with port 80h debug card inserted.
The last POST code set by BIOS usually remains on the display and only
changes when BIOS does something like suspend/resume. IIRC, there was a
program that was able to display temperature from onboard sensors on the
port 80h display that's integrated on some mainboards.

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