Dear Madhu,
In message 23c3598d8b87452eb6a3d1f52afb8a34@SG2PR01MB0394.apcprd01.prod.exchangelabs.com you wrote:
We are looking for FTP client command in U-boot commands, So that, we can boot the O.S kernel-image through ftp-client(instead of tftpboot over network).
It would have been usful if you had told us whyyou thing the existing network protocols (TFTP, NFS) are not sufficient for your use cases?
Why doesn't the U-boot support FTP client ?
FTP is based on TCP/IP, but U-Boot implements just a very minimal set of UDP based protocols.
Can we implement/add the FTP client protocol code to U-boot sources and customize. if so, how much work activity involved in this ?
Is this just need to write a small ftp-client program file by using TCP stream sockets (as like in Linux) ? Or do we need to write up anything more like TCP/IP network stack..
Right, in the first step you would need to implement a full-blown TCP/IP stack, which would most probably require some other deep-goig changes (keep for example in mind that U-Boot is [intentionally] strictly single-threaded; many implementations don't even support interrupts).
The big question is: why should we do that? U-Boot is a boot loader. If you need OS functionality like a full-blown network stack, than just boot an OS ...
Best regards,
Wolfgang Denk