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Newer firmware can manage the SDCDIV clock divisor register, allowing the divisor to scale with the core as necessary. Leverage this ability if the firmware supports it. Adapted from the following raspberrypi Linux kernel commit: bcm2835-sdhost: Firmware manages the clock divisor https://github.com/raspberrypi/linux/commit/08532d242d7702ae0add95096aa49c5e96e066e2 Signed-off-by: Vincent Fazio <vfazio@xes-inc.com> Signed-off-by: Peter Robinson <pbrobinson@gmail.com>
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