lauren73 (sent by Nabble.com) wrote:
Thanks a lot! I am sorry for confusing you. But the fact is that the 2 boards are connected as the following drawing. The hardware is designed as this. I need to download kernel for board 2 from hard drive of board 1. Usually switch cannot talk to switch without bridge or router. So in this case I think I need VPN in order to download the kernel using tftp.
HD----CPU1 ----switch1 ------switch 2----CPU2 (uboot) |----------board 1------ ---|-------------board 2--------------|
Assuming switch1 and switch2 are normal ethernet switches, you need a crossover cable connecting switches 1 and 2 (Tx of switch 1 -> Rx of switch 2 and vice versa) unless your switch PHYs support auto-crossover. You need CPU1 to run TFTP server software. The it should Just Work[tm], no VPN or VLAN.
On the other hand, your hardware may not be normal ethernet switches, in which case we have even less of a clue than you.
gvb