Blackfin: work around anomaly 05000220
When possible, work around anomaly 05000220 (external memory is write back cached, but L2 is not cached). If not possible, detect the conditions at build time and reject any qualifying configurations. Signed-off-by: NGraf Yang <graf.yang@analog.com> Signed-off-by: NMike Frysinger <vapier@gentoo.org>
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