I tried uncommenting the lines in /boot/uEnv.txt about disabling HDMI, but it did not help. I also tried typing in *optargs=capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART3,BB-UART5* at the end of that file. Then I was trying to type optargs=quiet capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN in order to explicitly disable the HDMI in the /boot/uEnv.txt, but it didn't help either.
It appears that HDMI is not enabled there whatsoever since in the slots file I don't have anything dedicated to it: *root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots* * 0: PF---- -1* * 1: PF---- -1* * 2: PF---- -1* * 3: PF---- -1* * 4: P-O-L- 0 Override Board Name,00A0,Override Manuf,BB-I2C1* * 6: P-O-L- 1 Override Board Name,00A0,Override Manuf,BB-UART1* * 7: P-O-L- 2 Override Board Name,00A0,Override Manuf,BB-UART2* * 8: P-O-L- 3 Override Board Name,00A0,Override Manuf,BB-UART4* * 9: P-O-L- 4 Override Board Name,00A0,Override Manuf,BB-UART5* *10: P-O-L- 5 Override Board Name,00A0,Override Manuf,BB-UART3* Are there any other possible sources of UART5 not working, aside from it interfering with HDMI? I tried several different boards and SD cards, but the port did not work on any of them. On Monday, May 22, 2017 at 9:47:08 PM UTC-4, Graham wrote: > > The IO pins used by UART5 are, by default, assigned to driving an LCD > screen. > You will need to reconfigure the IO, so that LCD/video is disabled, and > the pins are re-assigned as UART I/O pins. > You will need to modify the boot file and device tree. > Start searching about how to edit the /boot/uEnv.text file, and your > different options for re-configuring the necessary pins. > > --- Graham > > == > > On Monday, May 22, 2017 at 8:04:06 PM UTC-5, [email protected] wrote: >> >> I am using a Beaglebone Black on a student project. In order to activate >> the UART5 port, I type in “echo BB-UART5 > >> /sys/devices/platform/bone_capemgr/slots” every time I power the board on. >> However, even though the port does seem to be activated, uart5 never works >> for any of the BBB’s I try (other UART ports on them work as well as usual) >> . What can cause such problems specifically with UART5? How can I fix it? >> > -- 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]. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/54415aca-e655-4107-9c36-da720d79a5d5%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
