From mboxrd@z Thu Jan  1 00:00:00 1970
From: Anatolij Gustschin <agust@denx.de>
Date: Sun, 26 Oct 2014 16:54:50 +0100
Subject: [U-Boot] Conditional boot
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Hi Marco,

On Thu, 23 Oct 2014 15:44:12 +0200
Marco Pavanelli <marco.pavanelli@servizist.it> wrote:

> I have learnt that with u-boot you can boot from different sources and in
> fact that works, but what I would like to achieve is to TRY FIRST booting
> from a network (tftp+nfs) and if it fails carry on to FLASH+SD.
> I have managed to boot both from tftp+nfs and from FLASH+SD but so far I
> have not been able to do it conditionally.

try with a custom bootscript, for more info please see
http://www.denx.de/wiki/view/DULG/CommandLineParsing

> In fact when I try to boot form tftp with a disconnected cable, the sysem
> keeps retrying forever with TFTP.

set the "netretry" variable to "no":

 setenv netretry no
 saveenv

and try again.

HTH,

Anatolij