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Date: Tue, 2 Apr 2002 02:25:54 -0800
From: Stuart Lynne <[EMAIL PROTECTED]>
To: David Brownell <[EMAIL PROTECTED]>
Cc: Stuart Lynne <[EMAIL PROTECTED]>
Subject: Re: [linux-usb-devel] Lineo USB Device Software
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On Tue, Apr 02, 2002 at 01:40:25AM -0800, David Brownell wrote:
>
> I'd like to see that work smoothly with the "usbnet"
> driver, which I think you're familiar with.
Yes, and quite liked. You'll notice that usbdnet has a very similiar
design. I got sick and tired of an older driver we where using for
testing that was getting hard to maintain and extend so I threw it
out and started from scrath using usbnet as a pattern for several
key areas.
> > serial
> >
> > And several bus interface drivers:
> >
> > StrongARM SA-1110
> > Linkup L7205
> > Hitachi SuperH 7727
> > ScanLogic SL11
>
> Heh ... you did the right thing, making sure that your API
> (whatever it is) talks to multiple device controllers before
> pitching it very widely. Though, on principle, I'll hope that
> it's not too hard to change things!
Yes, it is probably a little over elaborated. We understand the problem
domain better now.
> > The network and serial drivers have optional CRC checking across all
> > bulk transfers (to compensate for problems with StrongARM and Linkup
> > FIFO implementations).
>
> Ah, I was wondering why you did that. It "shouldn't" be necessary,
> and (at least when I first noticed it through Zaurus) docs were not
> available to explain why. Presumably Ethernet CRC checks are
> not going to solve the problem -- you want per-packet retransmit
> to do the job it's supposed to do?
That happens down at the USB level, and typically works ok. See the
message I just sent out explaining CRC rationale (it is there to allow
is to drop corrupt data, data corrupted typically between the USB
hardware fifo's and the host CPU).
> But since it seems to be, on those device controllers, it'd likely
> be worth teaching "usbnet" about that (a fourth framing option).
>
> > The network driver configuration uses a new CDC Class extension that
> > allows CDC type configurations to be implemented using a single
> > interface and two bulk endpoints.
>
> Hmm, I'll hope the source comments explain that (tomorrow :).
> As a rule I encourage sticking to standards as-written. Though
> I know committee-itis all too well.
Yes, well, and with the latest USB specifications it is nicely possible
to implement and identify customized specifications by embedding a GUID
in the configuration :-)
> > I hope to have a mailing list setup in the next day or so. Send me
> > email if you are interested.
>
> Might well be. I barely glanced at your interfaces before deciding
> not to read more tonight.
>
> Got any particular plans for this -- like help coordinate a general
> Linux-USB "Device Controller" API?
Sure.
--
__O
Lineo - Where Open Meets Smart _-\<,_
PGP Fingerprint: 28 E2 A0 15 99 62 9A 00 (_)/ (_) 88 EC A3 EE 2D 1C 15 68
Stuart Lynne <[EMAIL PROTECTED]> www.lineo.com 604-461-7532
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