Thanks Robert, I forgot to mention the specifics of my attempts to disable HDMI. I modified /boot/uboot/uEnv.txt to disable HDMI by changing the optargs line:
ubuntu@ubuntu-armhf:~$ cat /boot/uboot/uEnv.txt optargs=fixrtc capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN loadfdt=ext4load mmc ${mmcdev}:2 ${fdtaddr} /boot/dtbs/${fdtfile} loaduimage=mw.l 4804c134 fe1fffff; if ext4load mmc 0:2 ${loadaddr} /boot/zImage; then mw.l 4804c194 01200000; echo Booting from external microSD...; setenv mmcdev 0; else setenv mmcdev 1; if test $mmc0 = 1; then setenv mmcroot /dev/mmcblk1p2 rw; fi; ext4load mmc 1:2 ${loadaddr} /boot/zImage && mw.l 4804c194 00c00000; echo Booting from internal eMMC...; fi mmcboot=run mmcargs; bootz ${loadaddr} - ${fdtaddr} uenvcmd=i2c mw 0x24 1 0x3e; run findfdt; if test $board_name = A335BNLT; then setenv mmcdev 1; mmc dev ${mmcdev}; if mmc rescan; then setenv mmc1 1; else setenv mmc1 0; fi; fi; setenv mmcdev 0; mmc dev ${mmcdev}; if mmc rescan; then setenv mmc0 1; else setenv mmc0 0; fi; run loaduimage && run loadfdt && run mmcboot ubuntu@ubuntu-armhf:~$ cat /sys/devices/bone_capemgr*/slots 1: 55:PF--- 2: 56:PF--- 3: 57:PF--- 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G 5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI UART4 still doesn't work and the 'slots' still show an HDMI entry. Is this what you are suggesting or did I miss something? Any ideas why it doesn't work? Phil On Tuesday, April 8, 2014 2:51:06 PM UTC-5, RobertCNelson wrote: > > On Tue, Apr 8, 2014 at 2:39 PM, <polloc...@gmail.com <javascript:>> > wrote: > > Hi, > > On my BBB I have a Serial RS-232 BeagleBone Cape (BB_BONE_SERL-03 Rev > A1) > > that I have jumpered for UART4. It works under Angstrom and was recently > > working under Ubuntu 12.04 LTS. Now it is not working under Ubuntu. > There > > seems to be pin error which may be preventing it from loading. I don't > know > > if this was caused by some configuration changes or not. I haven't been > > able to figure out what is causing the conflict. > > > > How can I find and fix this problem? > > > > Thanks for your help. > > > > Phil > > > -------------------------------------------------------------------------------------------------------------------- > > > > Background Information: > > > > 1. This is not a hardware problem. I have tested the same cape board > under > > Angstrom and it works (a remote putty serial session receives the > > transmission); however, nothing is received from Ubuntu: > > > > root@ubuntu-armhf:/home/ubuntu# echo hello > /dev/ttyO4 > > > > > > Note: I also tested UART4 using another micro-cape board that was > working > > earlier - it also failed. > > > > 2. Some time ago I replaced /boot/dtbs/am335x-boneblack.dtb (decompiled, > > modified, recompiled .dts) to enable UART4 (/dev/ttyO4): > > > > ... > > serial@481a8000 { > > compatible = "ti,omap3-uart"; > > ti,hwmods = "uart5"; > > clock-frequency = <0x2dc6c00>; > > reg = <0x481a8000 0x2000>; > > interrupts = <0x2d>; > > status = "okay"; > > linux,phandle = <0x1b>; > > phandle = <0x1b>; > > }; > > ... > > This was working under Angstrom and Ubuntu. > > > > 3. I tried restoring the original /boot/dtbs/am335x-boneblack.dtb and > used > > a .dtbo overlay for UART 4 - it still didn't work. > > > > 4. I scanned dmesg for config errors: > > > > ubuntu@ubuntu-armhf:~$ dmesg | grep -iE "uart|tty|error:" > > > > [ 0.000000] Kernel command line: console=ttyO0,115200n8 fixrtc > > root=/dev/mmcblk0p2 ro rootfstype=ext4 rootwait > > [ 0.507160] omap_uart 44e09000.serial: did not get pins for uart0 error: > -19 > > [ 0.507505] 44e09000.serial: ttyO0 at MMIO 0x44e09000 (irq = 88) is a > OMAP > > UART0 > > [ 1.218231] console [ttyO0] enabled > > [ 1.222660] omap_uart 481a8000.serial: did not get pins for uart4 error: > -19 > > [ 1.230408] 481a8000.serial: ttyO4 at MMIO 0x481a8000 (irq = 61) is a > OMAP > > UART4 > > > > ubuntu@ubuntu-armhf:~$ dmesg | grep capemgr > > > > [ 1.314500] bone-capemgr bone_capemgr.9: Baseboard: > > 'A335BNLT,0A5C,2513BBBK0965' > > [ 1.322289] bone-capemgr bone_capemgr.9: > > compatible-baseboard=ti,beaglebone-black > > [ 1.354316] bone-capemgr bone_capemgr.9: slot #0: 'BeagleBone RS232 > > CAPE,00A1,Beagleboardtoys,BB-BONE-SERL-03' > > [ 1.392362] bone-capemgr bone_capemgr.9: slot #1: No cape found > > [ 1.429467] bone-capemgr bone_capemgr.9: slot #2: No cape found > > [ 1.466577] bone-capemgr bone_capemgr.9: slot #3: No cape found > > [ 1.472829] bone-capemgr bone_capemgr.9: slot #4: specific override > > [ 1.479431] bone-capemgr bone_capemgr.9: bone: Using override eeprom > data at > > slot 4 > > [ 1.487466] bone-capemgr bone_capemgr.9: slot #4: > > 'Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G' > > [ 1.497595] bone-capemgr bone_capemgr.9: slot #5: specific override > > [ 1.504197] bone-capemgr bone_capemgr.9: bone: Using override eeprom > data at > > slot 5 > > [ 1.512234] bone-capemgr bone_capemgr.9: slot #5: > > 'Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI' > > [ 1.522697] bone-capemgr bone_capemgr.9: loader: before slot-0 > > BB-BONE-SERL-03:00A1 (prio 0) > > [ 1.531582] bone-capemgr bone_capemgr.9: loader: check slot-0 > > BB-BONE-SERL-03:00A1 (prio 0) > > [ 1.540465] bone-capemgr bone_capemgr.9: loader: before slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 1.549338] bone-capemgr bone_capemgr.9: loader: check slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 1.558137] bone-capemgr bone_capemgr.9: initialized OK. > > [ 1.563745] bone-capemgr bone_capemgr.9: loader: before slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > [ 1.572511] bone-capemgr bone_capemgr.9: loader: check slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > [ 1.594787] bone-capemgr bone_capemgr.9: loader: after slot-0 > > BB-BONE-SERL-03:00A1 (prio 0) > > [ 1.603587] bone-capemgr bone_capemgr.9: loader: check slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 1.618764] bone-capemgr bone_capemgr.9: loader: check slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > [ 1.633551] bone-capemgr bone_capemgr.9: slot #0: Requesting part > > number/version based 'BB-BONE-SERL-03-00A1.dtbo > > [ 1.650222] bone-capemgr bone_capemgr.9: slot #0: Requesting firmware > > 'BB-BONE-SERL-03-00A1.dtbo' for board-name 'BeagleBone RS232 CAPE', > version > > '00A1' > > [ 61.751962] bone-capemgr bone_capemgr.9: failed to load firmware > > 'BB-BONE-SERL-03-00A1.dtbo' > > [ 61.760833] bone-capemgr bone_capemgr.9: loader: failed to load slot-0 > > BB-BONE-SERL-03:00A1 (prio 0) > > [ 61.772418] bone-capemgr bone_capemgr.9: loader: check slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > [ 61.772447] bone-capemgr bone_capemgr.9: loader: after slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > [ 61.772475] bone-capemgr bone_capemgr.9: slot #5: Requesting firmware > > 'cape-boneblack-hdmi-00A0.dtbo' for board-name 'Bone-Black-HDMI', > version > > '00A0' > > [ 61.772500] bone-capemgr bone_capemgr.9: slot #5: dtbo > > 'cape-boneblack-hdmi-00A0.dtbo' loaded; converting to live tree > > [ 61.772829] bone-capemgr bone_capemgr.9: slot #5: #4 overlays > > [ 61.773958] bone-capemgr bone_capemgr.9: loader: check slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 61.773982] bone-capemgr bone_capemgr.9: loader: after slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 61.774012] bone-capemgr bone_capemgr.9: slot #4: Requesting firmware > > 'cape-bone-2g-emmc1.dtbo' for board-name 'Bone-LT-eMMC-2G', version > '00A0' > > [ 61.774028] bone-capemgr bone_capemgr.9: slot #4: dtbo > > 'cape-bone-2g-emmc1.dtbo' loaded; converting to live tree > > [ 61.774534] bone-capemgr bone_capemgr.9: slot #4: #2 overlays > > [ 61.774704] bone-capemgr bone_capemgr.9: slot #4: Applied #2 overlays. > > [ 61.774719] bone-capemgr bone_capemgr.9: loader: done slot-4 > > BB-BONE-EMMC-2G:00A0 (prio 1) > > [ 61.964834] bone-capemgr bone_capemgr.9: slot #5: Applied #4 overlays. > > [ 61.964861] bone-capemgr bone_capemgr.9: loader: done slot-5 > > BB-BONELT-HDMI:00A0 (prio 1) > > > > > > 5. I checked the /dev/ttyO4 settings and made sure they matched the > remote > > putty settings. > > > > ubuntu@ubuntu-armhf:~$ stty -F /dev/ttyO4 > > speed 9600 baud; line = 0; > > -brkint -imaxbel > > > > > > 6. I checked the current capemgr slots: > > > > ubuntu@ubuntu-armhf:~$ cat /sys/devices/bone_capemgr.*/slots > > 1: 55:PF--- > > 2: 56:PF--- > > 3: 57:PF--- > > 4: ff:P-O-L Bone-LT-eMMC-2G,00A0,Texas Instrument,BB-BONE-EMMC-2G > > 5: ff:P-O-- Bone-Black-HDMI,00A0,Texas Instrument,BB-BONELT-HDMI > > > > 7. I checked for any running processes that might be locking the device > - > > none were seen: > > > > ubuntu@ubuntu-armhf:~$ ps waux | grep tty > > root 484 0.0 0.1 3364 708 tty4 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty4 > > root 486 0.0 0.1 3364 708 tty5 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty5 > > root 491 0.0 0.1 3364 708 tty2 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty2 > > root 494 0.0 0.1 3364 708 tty3 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty3 > > root 497 0.0 0.1 3364 708 tty6 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty6 > > root 573 0.0 0.1 3364 708 tty1 Ss+ 19:07 0:00 > /sbin/getty > > -8 38400 tty1 > > root 574 0.0 0.1 1612 636 ttyO0 Ss+ 19:07 0:00 > /sbin/getty > > 115200 ttyO0 > > ubuntu 772 0.0 0.1 3116 712 pts/0 S+ 19:24 0:00 grep > > --color=auto tty > > > > > > 8. I tried to disable the HDMI interface but couldn't find a way that > would > > work. > > Add to your bootargs: > capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN > > > -- > Robert Nelson > http://www.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 beagleboard+unsubscr...@googlegroups.com. For more options, visit https://groups.google.com/d/optout.