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.ar...@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 <gongyi...@leadcoretech.com>
Hi，Arjun
Nice to meet u, but what your doubts?
-----邮件原件-----
发件人: arjun rath [mailto:rath.ar...@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 <gongyi...@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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