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overo: handle board revision detection for fab revisions <= R2410
Revisions < R2410 connect gpio112 to the 4030 irq_1 line. Since gpio112 is now used for board revision, this could lead to an erroneous board revision results depending on the state of the irq. This patch forces a 4030 RTC interrupt, which pulls irq_1 low, giving a low level on gpio112 on these boards. This gives a proper revision 0 result for these boards.
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