From mboxrd@z Thu Jan  1 00:00:00 1970
From: Vitaly Kuzmichev <vkuzmichev@mvista.com>
Date: Fri, 13 Aug 2010 17:12:25 +0400
Subject: [U-Boot] [PATCH v2 3/8] USB-CDC: Use native debug printout
	macros
In-Reply-To: <4C6542A3.5040009@dawes.za.net>
References: <1281617086-21220-1-git-send-email-vkuzmichev@mvista.com>	<1281704276-29115-1-git-send-email-vkuzmichev@mvista.com>
	<4C6542A3.5040009@dawes.za.net>
Message-ID: <4C6544B9.3000503@mvista.com>
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To: u-boot@lists.denx.de

Hi,

Rogan Dawes wrote:
>> +#define DEBUG
>> +#undef DEBUG
>> +
> 
> Eh?

Such thing is used to let someone know that this driver supports debug
output through native U-Boot macros. So one need to comment #undef to
compile ether.c with debug messages.
There are at least 67 files in U-Boot that use such construction.