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Jeff Garzik authored
IRQ mask bits assumed a 60xx or newer generation chip, which is very wrong for the 50xx series. Luckily both generations shared the per-port interrupt mask bits, leaving only the "misc chip features" bits to be completely mismatched. Fix 50xx by ensuring we only program bits that exist. Signed-off-by: Jeff Garzik <jeff@garzik.org>
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