Enable UART BeagleBone Black

root@beaglebone:/home/debian# echo > BB-UART1 > /sys/devices/bone_capemgr.9/slots

root@beaglebone:/home/debian# cat /sys/devices/bone_capemgr.9/slots
 0: 54:PF--- 
 1: 55:PF--- 
 2: 56:PF--- 
 3: 57:PF--- 
 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G
 5: ff:P-O-L Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI
 7: ff:P-O-L Override Board Name,00A0,Override Manuf,BB-UART1

debian@beaglebone:~$ ls -l /dev/ttyO*
crw-rw---- 1 root tty     248, 0 May 15  2014 /dev/ttyO0
crw-rw---T 1 root dialout 248, 1 Mar 24 05:17 /dev/ttyO1

root@beaglebone:/dev# nano /boot/uboot/uEnv.txt
##Example
#cape_disable=capemgr.disable_partno=
#cape_enable=capemgr.enable_partno=BB-UART1

I was able to enable all the 4.5 UARTs automatically at bootup on Debian 10 using this method