From mboxrd@z Thu Jan  1 00:00:00 1970
From: Detlev Zundel <dzu@denx.de>
Date: Fri, 22 Jan 2010 16:20:08 +0100
Subject: [U-Boot] Performance problems with gunzip
In-Reply-To: <000401ca9b73$3e5ff1e0$bb1fd5a0$@de> (A. Geisreiter's message of
	"Fri, 22 Jan 2010 15:57:37 +0100")
References: <000301ca9b6b$ad2c7ba0$078572e0$@de>
	<m24omedwql.fsf@ohwell.denx.de> <000401ca9b73$3e5ff1e0$bb1fd5a0$@de>
Message-ID: <m2vdeucgk7.fsf@ohwell.denx.de>
List-Id: <u-boot.lists.denx.de>
MIME-Version: 1.0
Content-Type: text/plain; charset="us-ascii"
Content-Transfer-Encoding: 7bit
To: u-boot@lists.denx.de

Hi Andreas,

> thanks for the fast response. How do I enable data caches? 

I fear this is not as easy as flipping a bit in a register.  Depending
on the platform caches tend to be tied to the MMU, so enabling the
caches require setting up correct data structures for the MMU to work.
That's the non-trivial work.

Apart from that, there is CONFIG_CMD_CACHE which builds
common/cmd_cache.c.  I see that at least two PXA250 platforms enable
this, so maybe simply try that?

Moreover, a quick qoogle showed that the (non-mainline) Gumstix verdex
(PXA270) U-Boot port has a dcache command:

http://docwiki.gumstix.org/index.php/U-Boot

Maybe you can reap the code from their repository.  If you do, please
post it here ;)

Cheers
  Detlev

-- 
There are three kinds of people in the world; those who can count and
those who can't.
--
DENX Software Engineering GmbH,      MD: Wolfgang Denk & Detlev Zundel
HRB 165235 Munich,  Office: Kirchenstr.5, D-82194 Groebenzell, Germany
Phone: (+49)-8142-66989-40 Fax: (+49)-8142-66989-80 Email: dzu at denx.de