can't setup more than 2 UART's at the same time

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1

hey,
i have a BBB and i want to use the UART port it has.
it has the latest debian image from the beagle website.
i use it with a screen via hdmi and a keyboard and a mouse.

after changing the uEnv.txt file to have

cape_enable=bone_capemgr.enable_partno=BB-UART0

cape_enable=bone_capemgr.enable_partno=BB-UART1
cape_enable=bone_capemgr.enable_partno=BB-UART2
cape_enable=bone_capemgr.enable_partno=BB-UART4
cape_enable=bone_capemgr.enable_partno=BB-UART5

the beagle won’t power up, the power led lights up but there is nothing on the screen.

i read that UART 4 is only available if you disable the hdmi port, is this true?
cause i used the UART4 with a different version of debian and it worked…

right now i only managed to get UART1 and UART2 to show after the command

“cat /sys/devices/platform/bone_capemgr/slots”

when writing only:

cape_enable=bone_capemgr.enable_partno=BB-UART1
cape_enable=bone_capemgr.enable_partno=BB-UART2

in the uEnv.txt file.

can some one please explain how can i use all 5 UART ports with the hdmi as well?
i have tried all day with around 5-7 installations of the debian image every time
because this got the beagle to drop dead.

thanks!

2

cape_enable=bone_capemgr.enable_partno=BB-UART0,BB-UART2,BB-UART4,BB-UART5

add:

dtb=am335x-boneblack-overlay.dtb

and you'll have eMMC/video disabled so you enable all the usarts..

Regards,

3

Doesn't matter, u-boot process the whole /boot/uEnv.txt file..

Regards,

4

Once you were successful here did you get the corresponding /dev/ttyO2 , /dev/ttyO4 , etc?