From mboxrd@z Thu Jan  1 00:00:00 1970
From: Stephen Warren <swarren@wwwdotorg.org>
Date: Mon, 23 Apr 2012 09:41:20 -0600
Subject: [U-Boot] Booting a dt zImage kernel
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On 04/23/2012 09:29 AM, Fabio Estevam wrote:
> On Mon, Apr 23, 2012 at 11:50 AM, Shawn Guo <shawn.guo@linaro.org> wrote:
> 
>> Why do you need to do that at all?  Turn on CONFIG_OF_LIBFDT, and you
>> will be able to boot an DT kernel (without dtb append) in the
>> following command.
>>
>> tftpboot 42000000 uImage; tftpboot 42800000 imx28-evk.dtb; bootm
>> 0x42000000 - 0x42800000
> 
> Ok, turned CONFIG_OF_LIBFDT and set:
> 
> bootcmd_net=run netargs; dhcp 0x42000000 uImage; dhcp 0x42800000
> imx28-evk.dtb; bootm 0x42000000 - 0x42800000
...
> Starting kernel ...
> 
> Uncompressing Linux... done, booting the kernel.
> 
> ,no console output after that. Any suggestions?

There could well be many additional reasons, but it's probably due to
http://lists.denx.de/pipermail/u-boot/2012-April/122781.html