Commits
H Hartley Sweeten committed 3ea07127d93
rtc: m48t86: verify that the RTC is actually present The RTC is an optional feature at purchase time on some Technologic Systems boards. Verify that it actually exists by checking if the last two bytes of the NVRAM can be changed. Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>