From mboxrd@z Thu Jan  1 00:00:00 1970
From: Shinya Kuribayashi <skuribay@ruby.dti.ne.jp>
Date: Wed, 26 Mar 2008 20:01:14 +0900
Subject: [U-Boot-Users] cache related query for MIPS
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Chetan Nanda wrote:
> My question here is why cache is tried to flushed and disabled before
> jumping into start location?

As described in source code, it seems be the QNX requirement.
I don't know much about QNX, but archives probably help you.

http://search.gmane.org/?query=bootelf+dcache_disable&author=&group=gmane.comp.boot-loaders.u-boot