Edited by AR9285 at Dec 23, 2015 03:58 |
Hardware: banana pi
Symptom: unable to power on after shutdown with UART cable attached, need to remove UART attachment to power on again
Steps to reproduce:
1. shutdown using 'shutdown -Ph now' with UART cable attached to CP2102 debug board, which is plugged into a computer
2. remove micro-usb DC-IN
3. reattach micro-usb DC-IN to power up
4. Board fails to power up, power led turns on red, but 'activity' led remains dimmed, UART has no output
Expected Behaviour: No need to remove UART cable to re-power on the device
Note: VCC is not attached, only GND, TXD and RXD
It seems the power from UART cable keeps the device in a slightly 'working' state, preventing the board from properly powering up.
Anyone expierenced this problem?