Let's start with a few clues. What board and revision level are you using? (example: BeagleBone Black, Rev C.)
What OS, version, release date and kernel are you using? What other changes, if any, have you made to the system software? What hardware / I-O do you have plugged into the accessory connectors? Do you have a serial debug cable plugged in? Is it giving you any boot errors or conflicts? == Why are you planning to mess with I2C-1 ? On Debian jessie, that is an internal control bus you should not touch, unless you really know what you are doing. I suspect that: BB-BONELT-HDMI,BB-BONELT-HDMIN only disables the HDMI, not the LCD drivers, and you should only disable the HDMI once, not twice. I am guessing that you still need to disable the LCD drivers. --- Graham --- On Wed, May 24, 2017 at 10:04 AM, <sspos...@bu.edu> wrote: > 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, sspo...@bu.edu 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 a topic in the > Google Groups "BeagleBoard" group. > To unsubscribe from this topic, visit https://groups.google.com/d/ > topic/beagleboard/3Rby6pdTUCg/unsubscribe. > To unsubscribe from this group and all its topics, send an email to > beagleboard+unsubscr...@googlegroups.com. > To view this discussion on the web visit https://groups.google.com/d/ > msgid/beagleboard/54415aca-e655-4107-9c36-da720d79a5d5%40googlegroups.com > <https://groups.google.com/d/msgid/beagleboard/54415aca-e655-4107-9c36-da720d79a5d5%40googlegroups.com?utm_medium=email&utm_source=footer> > . > > For more options, visit https://groups.google.com/d/optout. > -- 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 beagleboard+unsubscr...@googlegroups.com. To view this discussion on the web visit https://groups.google.com/d/msgid/beagleboard/CANN_KV5S3LVUEfQCpjUy-kJU94axR9uvX6SCWO_cYWNuWg94dw%40mail.gmail.com. For more options, visit https://groups.google.com/d/optout.