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Date: Fri, 16 Mar 2012 10:18:57 +0000
From: Andy Furniss <andyqos@ukfsn.org>
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Subject: Re: cxd2820r: i2c wr failed (PCTV Nanostick 290e)
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Andy Furniss wrote:
> (maybe echo 3 > /proc/sys/vm/drop_caches would also work

I don't know if it makes any difference, but I missed a bit from that - 
maybe this would be safer -

sync;echo 3 > /proc/sys/vm/drop_caches