[U-Boot] 答复: 答复: tftp download with USB vitrual ethnet driver

[Dennis.Yxun]

HI Arjun:
   There is a DFU implementaion for Openmoko Neo FR, and this device samsung
is base on
 s3c2442 SOC. Maybe quite similar to your smdk platform.
   http://wiki.openmoko.org/wiki/Bootloader

   Hope helps.

Dennis

2009/3/10 龚益斌 <gongyibin at leadcoretech.com>

> Hi，Arjun
>         Sorry to reply your email with CC to everyone, because I’m not sure
> I can resolve your problem but maybe guys in mail list can do this easily.
> Can u tell me which ways do u choose to download binary to U-boot, use tftp
> or serial communication( host need install matched driver)? If you choose
> tftp protocol over usb, you need change BULK OUT size (Rx size, not MPS)
> from 64 to 1500，because every UDP package from host will not exceed it. If
> you didn’t want to do this, you must check every data from usb and packet
> into normal UDP .
>
> Gongyibin
>
> -----邮件原件-----
> 发件人: arjun rath [mailto:rath.arjun at gmail.com]
> 发送时间: 2009年3月10日 12:21
> 收件人: 龚益斌
> 主题: Re: 答复: [U-Boot] tftp download with USB vitrual ethnet driver
>
> Hi,
>
> Thanks for your reply.
>
> Actually m working for smdk2440 development board.In u-boot level,i have to
> develop a virtual console using CDC_ACM to eliminate the use serial
> communication(jtag).Now i am able to see the boot prompt over usb line using
> CDC_ACM.
>
> When m doing a BULK OUT transfer(for downloading binary images) only 47-48
> bytes are being transferred.My BULK OUT endpoint packet size is 64(full
> speed device).If i will send a kernel binary image,its sending one packet
> and then the host is retrying for 4 times and i think then its drops the
> packet.
>
> Can u tell me any solution regarding this.If u want i can send u the source
> code too.
>
> Waiting for your reply
>
> Thanks & Regards
>
> Arjun
> 2009/3/10 龚益斌 <gongyibin at leadcoretech.com>
> Hi，Arjun
>         Nice to meet u, but what your doubts?
>
> -----邮件原件-----
> 发件人: arjun rath [mailto:rath.arjun at gmail.com]
> 发送时间: 2009年3月9日 19:48
> 收件人: 龚益斌
>
> 主题: Re: [U-Boot] tftp download with USB vitrual ethnet driver
>
> Hi,
>
>
> Can u clarify some doubts regarding USB CDC ACM driver in u-boot.I want to
> use for the same quick downloading purpose over usb line instead of serial
> line.
>
> Thanks
>
> Arjun
> 2009/3/9 龚益斌 <gongyibin at leadcoretech.com>
> Hi，all,
> I’m am new guy from China, and nice to meet all of yours. These days we use
> u-boot in out Linux Project base on our SOC chip, and we found it’s not
> convenient to download kernel image because our board have no ether-net
> chip, only USB and UART. Linux-2.6.21 etc, support USB CDC subnet(Boot
> Loader OBject), so if we write a USB device driver and a  virtual Ethernet
> card driver over it , we can realize TFTP download with USB. Now we have
> test successfully in our project, if necessary I’m very glad to contribute
> it~
> Regards,
> Gongyibin
>
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