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

[龚益斌]

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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