[U-Boot] How to enable 2 FCC Ports while booting using CONFIG_NET_MULTI

[Gurumurthy Gowdar]

Dear Sir,
         i want only one ethernet port active at a time. so to acheive this how to use CONFIG_NET_MULTI. i have enabled one ethernet port at present i.e. FCC2. how to enable two ports so that when i ping or give network command its should ping depending upon selected port.

With Regards,
Gurumurthy

On Tue, 27 Oct 2009 14:09:51 +0530  wrote
>Dear "Gurumurthy Gowdar",

In message  you wrote:
> 
> 
>     please let me know how to enable two Ethernet Ports in
> U-boot for MPC8280 at booting time. After booting i should be able to
> ping the two ports i.e. FCC1 and FCC2 only by connecting the ethernet
> cable to the repective port (FCC1 & FCC2.

You don't. You don;t do this at all.

U-Boot does not enable any peripherals "at booting time". This is a
design principle, see
http://www.denx.de/wiki/view/U-Boot/DesignPrinciples#2_Keep_it_Fast

Ethernet ininitlization is only done when U-Boot attempts to perform a
network command, and then only that single interface gets initialized
which U-Boot is going to use.

> currently i have enabled one port FCC2 as ethact port, can i change
> this depending by which port i want to ping.

Yes, you can toggle between several ports. But keep in mind that only
one of them will be active at any time, if any at all.

> i came to know about CONFIG_NET_MULTI whether this will be the
> solution for using two ports at a time.

You cannot use two ports at the same time, only one or the other. But
it is possible to switch at runtime (either automatically when a
download fails or manually by setting the "ethact" environment
variable accordingly).

Best regards,

Wolfgang Denk

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