From mboxrd@z Thu Jan  1 00:00:00 1970
Message-ID: <ed91f7ee5db4e3779d7fffb51ec5f9b7@hamnavoe.com>
To: 9fans@9fans.net
From: Richard Miller <9fans@hamnavoe.com>
Date: Fri, 19 Oct 2012 15:00:01 +0100
In-Reply-To: <d5f17ff7549d19205f31038cddeac9d9@brasstown.quanstro.net>
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Subject: Re: [9fans] sheevaplug SD card driver
Topicbox-Message-UUID: c03a629a-ead7-11e9-9d60-3106f5b1d025

> could you explain the ccmalloc trick?

"cache coherent malloc" - not really a trick, just a way to
ensure SD buffers are cache-aligned and occupy an integral
number of cache lines, to avoid embarrassment when doing
dma on ARM (which bypasses the cache).  It costs a bit of
space but saves copying.