Our device's enumeration has four phases:
1,report vid/pid 0xaaaa/0xbbbb
2,broken from host after 10 seconds
3,report vid/pid 0xcccc/0xdddd
4,working now
In fedora 7, our device stoped at phase 1. I don't know why.
Abei
From: David Brownell <[EMAIL PROTECTED]>
To: linux-usb-devel@lists.sourceforge.net
CC: "gutian abei" <[EMAIL PROTECTED]>
Subject: Re: [linux-usb-devel] About current state of supporting USB
selective suspend feature
Date: Fri, 3 Aug 2007 07:17:55 -0700
On Friday 03 August 2007, gutian abei wrote:
> I am trying to develop a USB device driver in Linux platform.
> Our device has the ability of re-enumeration.
Like the Cypress chips, which use one device ID before the
firmware is loaded and then another one later after it restarts
with that new firmware? The "fxload" tool can be used to put
new firmware into those devices.
> That is when our device plug
> into host PC it reports a vid/pid, for example 0xaaaa/0xbbbb, after 10
?> > seconds �it ?changes �the state of �D+ �and D- ?to �let PC enumerate
it
> again, and it reports a new vid/pid, for example 0xcccc/0xdddd.
> Then our device uses 0xcccc/0xdddd to play with host PC.
So the question is: Why doesn't it come up as cccc/dddd in
the first place? If it just randomly decides to switch IDs,
it sounds like "broken by design" hardware. But I suspect
there's actually a purpose to it ... one which you don't yet
understand.
> But in my Fedora 7 system(I install it today, not update yet!), it
doesn't
> enumerate the second vid/pid. It just enumerate the first
> vid/pid(0xaaaa/0xbbbb). I use usbview tool to test my device.
> Does anyone have experience to resolve it?
So this question doesn't have even the least bit to do with
selective suspend, then. Use accurate $SUBJECT lines.
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