I do not know that uboot would / would not damage your UART device, but I also do not know that it will not. Then as dickelbeck mentions above there are other potential pitfalls.
As for the Linux console, this could / should be configurable via inittab, but uboot I have no idea exactly what needs to be done. This would most definitely need source editing and binary recompiling. On Wed, Mar 5, 2014 at 7:59 AM, dickelbeck <[email protected]> wrote: > The debug UART has both the uboot software behind it on boot, and later a > linux serial console. > > During boot, if your device emits any characters, this will trick uboot > into putting up its menu and hanging the boot process. It will be waiting > for you to make a menu choice and your device will know nothing of it. > > Assuming you miss that one second window, plus all the time preceding > uboot coming up under power where the uart's fifo will be filled, then you > will clear uboot. But this is too much risk. > > The next phase of the boot has linux hosing its console output to the same > debug port, and depending on the linux setup, you may have a serial console > come up on that UART also. I do here. > > So the debug uart port is difficult to use for anything but debug. > > Use another UART. The device you describe may be using TTL serial, you > did not mention RS-232 levels. This should be confirmed. If TTL, your > device may still be at a voltage which is too high for the beaglebone to > handle. Check the datasheet for 5V compatibility. I doubt its > acceptable. If your device is assuredly TTL at 3.3V then it will probably > work hardware wise by just hooking up the device, crossing TX with RX and > tying GND to GND. The 3 wires you say. Then you have to PINMUX in the > UART's TX and RX pins, or pick a UART you know is already pinmuxed out. > > > -- > 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]. > For more options, visit https://groups.google.com/groups/opt_out. > -- 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]. For more options, visit https://groups.google.com/groups/opt_out.
