Date: Sat, 29 Mar 2003 08:31:51 -0800
From: David Brownell <david-b@pacbell.net>
Subject: Re: netchip's net2280 usb 2.0 device
To: Kallol Biswas <kallol.biswas@efi.com>
Cc: linux-kernel@vger.kernel.org
Message-id: <3E85CA77.2020301@pacbell.net>
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Hi,

>      We have been using the net2280 chip (usb 2.0) as a usb target
> printer device. We have been seeing data corruption problems
> during a bulk out transfer when data is taken out the device
> quite slow.  The corruption size is only 4 bytes suggesting
> a device problem. Is anyone using this chip and has anyone
> encountered similar problem?

I've certainly been using it ... there's a Linux driver for it,
part of a "USB Gadget" framework that could support other such
"target mode" hardware, at http://kernel.bkbits.net/~david-b
for general use.  (Download from BK, the 2.5.64 patch doesn't
include the net2280 driver and there's no 2.4 patch yet.  I'll
send out an announcement soon, when I update the patches.)

I haven't run into that particular problem, but it sounds
like it might be a known erratum ... have you asked NetChip, or
checked the 14-March errata at their website?  They've been
pretty responsive to my questions.


> Is there any other 2.0 usb chip that can be used as a target mode
> device?

The net2280 is the only such chip I know of that talks PCI
directly.  So it's particularly Linux-friendly:  it doesn't
need special bus adapter hardware.

- Dave


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