Try adding them under Additional custom capes part not the Override cape 
with EEPROM

###Additional custom capes
uboot_overlay_addr4=/lib/firmware/BB-I2C1-00A0.dtbo
uboot_overlay_addr5=/lib/firmware/BB-ADC-00A0.dtbo
uboot_overlay_addr6=/lib/firmware/BB-UART4-00A0.dtbo
#uboot_overlay_addr7=/lib/firmware/<file7>.dtbo
###

I added UART4 there on my BeagleBoneBlack with Jessie on it and kernel 
4.4-ti and it shows up as /dev/ttyO4.

Let me know if this works,

MG

On Friday, November 2, 2018 at 12:26:44 PM UTC-4, [email protected] wrote:
>
> Hi,
>
> I've been working on a Beaglebone Green Wireless for a few weeks and have 
> been using USB FTDI for serial communication.  I now need to use the 
> onboard UART1, UART2 and UART4.
>
> I have been googling and reading through all the topics on the Forum and 
> ended up wrecking my image twice so I really need help.
>
> I'm using the latest *bone-debian-9.5-iot-armhf-2018-10-07-4gb.img  *
>
> When I try using *config-pin 911 uart*  I get a message that P9_11 pinmux 
> file not found.  Pin has no cape: P9_11 
>
> I have also tried updating the uEnv file with the following
>
> cape_enable=bone_capemgr.enable_partno=BB-UART1
>
> This caused my BBG to throw errors on boot and I wasn't able to access the 
> device
>
> After a rebuild I made the above change to uEnv.txt and then added the 
> overlays but on boot I got errors that they could not be loaded.
>
> ###Overide capes with eeprom
> uboot_overlay_addr0=/lib/firmware/BB-UART1-00A0.dtbo
> uboot_overlay_addr1=/lib/firmware/BB-UART2-00A0.dtbo
> uboot_overlay_addr2=/lib/firmware/BB-UART4-00A0.dtbo
>
>
>
> What is the current recommended method to configure UART on a beaglebone from 
> scratch and one that will persist between restarts?
>
>
> Thanks in advance.
>
>

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