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i.MX6UL 25MHz xtalosc_ref_clk issue

Question asked by Pieter Cardoen on Nov 4, 2016
Latest reply on Dec 1, 2016 by Pieter Cardoen



I am trying to enable the 25MHz i.MX6UL 25MHz reference clock at output pin GPIO1_IO02 for a custom board. I've configured the IOMUX to use ALT3 for this pad and I've configured the register CCM_ANALOG_PLL_ENETn (enabled ENET_25M_REF_EN, disabled bypass, BYPASS_CLK_SRC source = 00, powerdown is disabled).


When I measure on the output pad of the controller, I am measuring a 24MHz signal. What could be the cause of this?


I am applying these actions in u-boot at start-up.