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From: "Matthias Weißer" <weisserm@arcor.de>
To: u-boot@lists.denx.de
Subject: [U-Boot] arm: Activating dcache breaks 'usb start' and	'tftpboot' on jadecpu
Date: Fri, 03 Dec 2010 17:48:01 +0100	[thread overview]
Message-ID: <4CF91F41.9020108@arcor.de> (raw)
In-Reply-To: <4CF91C31.8060005@free.fr>

Am 03.12.2010 17:34, schrieb Albert ARIBAUD:
> In addition to making sure that register reads/write are not bitten by 
> caching, note that some controllers have DMA capabilities which require 
> proper cache handling for DMA memory buffers -- typically flushing them 
> from cache before a DMA to the device, and invalidating their cache 
> entries after a DMA from the device.

This is true. DMA and caching can be a lot of fun for a driver developer
:-) But I can guarantee that the network driver doesn't use any DMA
transfer as the hardware doesn't support it.

Thanks
Matthias Wei?er

  reply	other threads:[~2010-12-03 16:48 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2010-12-03 14:27 [U-Boot] arm: Activating dcache breaks 'usb start' and 'tftpboot' on jadecpu Matthias Weißer
2010-12-03 14:47 ` Wolfgang Denk
2010-12-03 15:09   ` Matthias Weißer
2010-12-03 15:33     ` Wolfgang Denk
2010-12-03 16:34       ` Albert ARIBAUD
2010-12-03 16:48         ` Matthias Weißer [this message]
2010-12-03 16:43       ` Matthias Weißer
2010-12-03 16:55         ` Wolfgang Denk

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