From: Jerry Van Baren <gerald.vanbaren@smiths-aerospace.com>
To: u-boot@lists.denx.de
Subject: [U-Boot-Users] Re : MV64460 Burst reads from BootCS
Date: Mon, 02 Oct 2006 08:14:09 -0400 [thread overview]
Message-ID: <45210291.8090004@smiths-aerospace.com> (raw)
In-Reply-To: <J6I04N$E478F7185EF5BEB3D21D5239909D9E4F@laposte.net>
sebastien.douheret wrote:
> Hi,
> Marvell MV64460 only supports burst reads/writes on 32bits
> width peripherals ;-(
> I have the same issue with a Lauterbach probe. You must deny
> burst on BootCS if this peripheral is not 32bits width !
> This restriction also penalize boot process ! If your boot
> flash is 16 or 8 bits witdh, you can't directly execute
> instructions in flash. Because CPU like MPC74xx always load
> instructions with burst reads.
>
> Regards.
> Sebastien.
I don't believe the above is strictly correct. The 74xx does burst
reads only if the cache is enabled for that memory area, so you should
be able to execute out of flash but would be unable to enable caching on
the boot memory area. After all, I presume the board boots out of flash.
gvb
next prev parent reply other threads:[~2006-10-02 12:14 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2006-10-02 7:43 [U-Boot-Users] Re : MV64460 Burst reads from BootCS sebastien.douheret
2006-10-02 12:14 ` Jerry Van Baren [this message]
-- strict thread matches above, loose matches on Subject: below --
2006-10-06 20:59 joe secund
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