As Robert says, do you see ttyS1 in your /dev directory? if so, what mode are the pins on p9_24 & p9_26 (config-pin -q 926;config-pin -q 924 )?
javalens@beaglebone:/dev$ config-pin -q 926;config-pin -q 924 P9_26 Mode: default Direction: in Value: 0 P9_24 Mode: default Direction: in Value: 1 is so try: sudo config-pin 924 uart; sudo config-pin 926 uart javalens@beaglebone:/dev$ sudo config-pin 924 uart; sudo config-pin 926 uart [sudo] password for javalens: javalens@beaglebone:/dev$ config-pin -q 926;config-pin -q 924 P9_26 Mode: uart P9_24 Mode: uart Regards, On Tuesday, July 18, 2017 at 12:49:34 PM UTC-4, RobertCNelson wrote: > > > > On Tue, Jul 18, 2017 at 12:49 AM, Nguyễn Hồng Quân <[email protected] > <javascript:>> wrote: > >> Hi Robert >> >> That /boot/uEnv.txt still doesn't work. >> >> Here is my content: >> >> ###U-Boot Overlays### >> ###Documentation: >> http://elinux.org/Beagleboard:BeagleBoneBlack_Debian#U-Boot_Overlays >> ###Master Enable >> enable_uboot_overlays=1 >> ### >> ###Overide capes with eeprom >> #uboot_overlay_addr0=/lib/firmware/<file0>.dtbo >> #uboot_overlay_addr1=/lib/firmware/<file1>.dtbo >> #uboot_overlay_addr2=/lib/firmware/<file2>.dtbo >> #uboot_overlay_addr3=/lib/firmware/<file3>.dtbo >> ### >> ###Additional custom capes >> uboot_overlay_addr4=/lib/firmware/BB-UART1-00A0.dtbo >> #uboot_overlay_addr5=/lib/firmware/<file5>.dtbo >> #uboot_overlay_addr6=/lib/firmware/<file6>.dtbo >> #uboot_overlay_addr7=/lib/firmware/<file7>.dtbo >> >> But after restarting BBB, the slot 4 is still absent: >> >> $ cat /sys/devices/platform/bone_capemgr/slots >> 0: ---l-- -1 >> 1: ------ -1 >> 2: ---l-- -1 >> 3: ---l-- -1 >> >> Log at the stage of cape_mgr initialization: >> >> $ journalctl >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: Baseboard: >> 'A335BNLT,00C0,2016BBBK2436' >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: >> compatible-baseboard=ti,beaglebone-black - #slots=4 >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: slot #0: auto >> loading handled by U-Boot >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: slot #1: auto >> loading handled by U-Boot >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: slot #2: auto >> loading handled by U-Boot >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: slot #3: auto >> loading handled by U-Boot >> Feb 11 16:28:01 arm kernel: bone_capemgr bone_capemgr: initialized OK. >> Feb 11 16:28:01 arm kernel: PM: bootloader does not support rtc-only! >> >> I updated the image to: >> >> $ cat /etc/dogtag >> rcn-ee.net console Ubuntu Image 2017-07-14 >> $ uname -a >> Linux arm 4.4.68-ti-r111 #1 SMP Wed Jun 28 13:40:31 UTC 2017 armv7l >> armv7l armv7l GNU/Linux >> > > With u-boot overlays, just ignore the slots and kernel messages.. > > Did you try using, /dev/ttyS1 ? > > It should be active. > > Regards, > > -- > Robert Nelson > https://rcn-ee.com/ > -- 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/d03393c4-83f5-4698-bff8-ceb4898880fd%40googlegroups.com. For more options, visit https://groups.google.com/d/optout.
