From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ilya Yanok <yanok@emcraft.com>
Date: Thu, 28 Jun 2012 02:28:29 +0400
Subject: [U-Boot] [PATCH v4 3/6] mcx: Disable DCACHE since USB EHCI is
	enabled
In-Reply-To: <1340230468-12811-4-git-send-email-trini@ti.com>
References: <1340209283-3404-1-git-send-email-trini@ti.com>
	<1340230468-12811-1-git-send-email-trini@ti.com>
	<1340230468-12811-4-git-send-email-trini@ti.com>
Message-ID: <4FEB890D.3010801@emcraft.com>
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To: u-boot@lists.denx.de

Hi,

21.06.2012 02:14, Tom Rini wrote:
> USB EHCI and DCACHE are not compatible, so disable DCACHE support at
> build-time as run-time disable is insufficient for USB use.

Sorry for missing this discussion. I think compile-time disabling of the 
cache is too brutal.
ehci-hcd cache handling is broken anyway: doing unaligned 
flushes/invalidates is a bug, and we know for sure that upper layers 
don't care about alignment (and I bet ehci-hcd does this even for its 
internal buffers). So what's the point in all this cache handling in 
ehci-hcd? It's not going to work anyway and just produces problems. So I 
suggest to just disable all this stuff until generic code will be fixed. 
Alternatively we can do bounce-buffering inside driver.

Regards, Ilya.