Thank you for the tips. I have unplug the other ends of both connectors that fail the boot then I got BOOTUP!!
It turn out to be the 3.3V lead of MW MPM-15-3.3 SMPS(switch mode power supply) is nearly short with the ground lead when it is inactive. So I have to unplug the 3.3V lead when I boot the BBG or find other 3.3V 3.5A power supply. Charles TJF於 2019年8月7日星期三 UTC+8下午11時18分16秒寫道： > > During boot the pins have to have the default configuration, and the wired > hardware must not influence the state of the pins. > > After boot, you can configure the desired pinmuxing and connect your > hardware. > > BTW: since you're booting from EMC, you can use 6 further GPIOs on the > SD-Card slot and 2 further on the JT header (unidirectional). > > Regards > -- For more options, visit http://beagleboard.org/discuss --- You received this message because you are subscribed to the Google Groups "BeagleBoard" group. To unsubscribe from this group and stop receiving emails from it, send an email to [email protected]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/deea53d2-2e33-460e-8086-4fb3e034def8%40googlegroups.com.
