From: Remy Bohmer <linux@bohmer.net>
To: u-boot@lists.denx.de
Subject: [U-Boot] [PATCH 2/3] Connect the AT91 UDC to USB CDC-ethernet support
Date: Fri, 13 Aug 2010 13:03:27 +0200 [thread overview]
Message-ID: <AANLkTincOtBd_mvP2he5xVfppeJ4THPEbJFJSnzQ1+qN@mail.gmail.com> (raw)
In-Reply-To: <4C652487.7060006@emk-elektronik.de>
Hi,
2010/8/13 Reinhard Meyer <u-boot@emk-elektronik.de>:
> Dear Remy Bohmer,
>>>
>>> 3. I did not follow the whole USB patches, my concern is
>>> what touches AT91, but please explain to me what for we need
>>> a board under u-boot to be a USB device. Since u-boot per se
>>> is not multitasking how is the traffic handled while
>>> at the command prompt?
>>
>> There is no traffic handled while at the command prompt. It behaves
>> just like any other 'normal' network adapter.
>> So, it brings up a USB connection once you start a network action like
>> a ping or tftp command. Once that completes the link is brought down
>> again.
>
> If I understand the procedure correctly now, its as follows:
>
> Any client network command on u-boot's command prompt like ping, dhcp, tftp
> etc. will 'up' the USB Device...
> The host to which it is connected to will happily discover and enumerate
> a network adapter with MAC and IP addresses...
Correct.
> And the host will be the server for that command...
The procedure is initiated by U-boot, since that one is pulling the D+
resistor up and down.
Network traffic is of course bidirectional, so U-boot can initiate a
TFTP transfer when it is up.
Kind regards,
Remy
next prev parent reply other threads:[~2010-08-13 11:03 UTC|newest]
Thread overview: 14+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-12 17:36 [U-Boot] [PATCH 1/3] Integrate USB gadget layer and USB CDC driver layer Remy Bohmer
2010-08-12 17:36 ` [U-Boot] [PATCH 2/3] Connect the AT91 UDC to USB CDC-ethernet support Remy Bohmer
2010-08-12 18:57 ` Reinhard Meyer
2010-08-12 19:50 ` Remy Bohmer
2010-08-12 20:56 ` Wolfgang Denk
2010-08-12 22:58 ` Reinhard Meyer
2010-08-13 9:14 ` Remy Bohmer
2010-08-13 10:55 ` Reinhard Meyer
2010-08-13 11:03 ` Remy Bohmer [this message]
2010-08-13 9:16 ` Remy Bohmer
2010-08-13 10:22 ` Wolfgang Denk
2010-08-13 11:18 ` Remy Bohmer
2010-08-13 14:04 ` Wolfgang Denk
2010-08-12 17:36 ` [U-Boot] [PATCH 3/3] Enable the use of Ethernet over USB (CDC) for the AT91SAM9261EK board Remy Bohmer
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