linux-kernel - Re: [LinuxBIOS] #57: libusb host program for PLX NET20DC debug device

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Message-Id: <77E505A2-6E0B-422F-92AB-97395730A522@kernel.crashing.org>
Date:	Sun, 3 Dec 2006 13:42:07 +0100
From:	Segher Boessenkool <segher@...nel.crashing.org>
To:	Stefan Reinauer <stepan@...esystems.de>
Cc:	"Eric W. Biederman" <ebiederm@...ssion.com>,
	Peter Stuge <stuge-linuxbios@....org>,
	linux-kernel@...r.kernel.org, linuxbios@...uxbios.org
Subject: Re: [LinuxBIOS] #57: libusb host program for PLX NET20DC debug device

> you could use io delay, one outb uses roughly 1us iirc.

On LPC, yes -- or 0.5us or something like that.  On ISA it's
a lot faster, on PCI too -- better do 20 or so outb's to be
safe.  Or use a *real* timer instead, you'll have to abstract
this for portability anyway...


Segher

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