I have custom board with imx6qp with similar configuration as of imx6q sabre sd. It is currently set to boot mode 10 i.e. internal boot and reads boot configuration from GPIOs. I am setting boot switches to boot from SD card, but board does not boot from sd card.
So through JTAG, i tried to read PLL registers. After reading registers, it looks like PLLs have not been locked or enabled. So is it that when in internal boot mode clocks/PLLs will be disabled ???
I have imx6q sabresd board also, it is also in internal boot mode. But if i read PLL registers , i see PLLs are being locked. So who is enabling the PLLs for sabre sd board??