as a first step i try to enable the UART4 from the uEnv.txt and change the console to ttyO4 : this is my full uEnv.txt : optargs=quiet drm.debug=7 capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN capemgr.enable_partno=BB-UART4 console=ttyO4,115200n8 mmcargs=setenv bootargs console=${console} run mmcargs;
there is nothing appear in the terminal . when the BBB has finished from booting operation , i make ssh connection with it , and check the loaded overlays cat /sys/devices/bone_capemgr.8/slots the result is UART4 overlay is loaded correctly , so i don't know why there is nothing appear in my terminal from the kernel console output On Thursday, May 8, 2014 4:52:22 PM UTC+3, Jason Kridner wrote: > > On Thu, May 8, 2014 at 5:54 AM, Samer Shatta > <samer....@gmail.com<javascript:>> > wrote: > > i am sure the the cable is pluged in in the right way , cause when i > connect > > my old BBB (Rev A5C) with the same cable and same settings it works > properly > > . > > so the problem is with my new BBB it self . > > if there is a way to change the u-boot console output to ttyO4 this will > be > > great , cause sending back my new BBB will cost me more than buying a > new > > one . > > You can successfully boot and log in, yes? LEDs blinking and all? > > Instructions like > > http://www.armhf.com/beaglebone-black-serial-uart-device-tree-overlays-for-ubuntu-and-debian-wheezy-tty01-tty02-tty04-tty05-dtbo-files/ > > will help you enable one of the other serial ports after boot. You'll > want to modify the default am335x-bone.dts to enable the ttyO4 at boot > and add console=ttyO4 to the uenv.txt, so that you'll start seeing > kernel output. I suggest you get to that point before trying to patch > u-boot to use a different default serial port. > > If you are having boot problems, simply start you work from a > known-good image and then work your way into something custom, rather > than starting from an unknown point. > > > > > > > On Thursday, May 8, 2014 2:26:21 AM UTC+3, Jason Kridner wrote: > >> > >> On Wed, May 7, 2014 at 6:06 PM, Samer Shatta <samer....@gmail.com> > wrote: > >> > Hello > >> > i have beaglebone black Rev A5C that works correctly with the Serial > >> > debug > >> > header > >> > > >> > yesterday i have bought a new beaglebone black Rev A6A (new BBB) , > but > >> > when > >> > i connect the serial FTDI debugger it didn't work at all > >> > there is nothing displayed on the host terminal when the new BBB boot > up > >> > > >> > i have tried to connect TX with RX from the debug header of the new > BBB > >> > and > >> > used minicom on the new BBB using with the following settings : > >> > ttyO0 > >> > 115200N1 > >> > no hardware flow control > >> > > >> > > >> > and try to write some chars , but nothing received , i think that the > >> > FTDI > >> > debug header is not connected with the ttyO0 , i think that there is > a > >> > hardware bug from the BBB factory . > >> > >> Are you certain you've got the hardware still setup properly (cable > >> plugged in right direction, terminal software configured the same, > >> etc)? > >> > >> If you have access to a scope, I suggest monitoring the line. > >> > >> Do you see the LEDs blink? Have you tried booting off of uSD? > >> > >> > > >> > if what i think is true so , i have to redirect the u-boot console > >> > output to > >> > another tty like ttyO4 , but i don't know how to do that . > >> > >> It might work to specify ttyO4 in the uenv.txt console= command line > >> argument and add the config enablement to the device tree. If you are > >> serious about this, I can break down a few of those steps for you. Of > >> course, that would just move the kernel output, not the u-boot output. > >> > >> Much of the relevant config info is in: > >> http://git.denx.de/?p=u-boot.git;a=blob;f=include/configs/am335x_evm.h > >> > >> (It is a bit of an odd legacy that the config is in am335x_evm, but it > >> was to make the code common with several other boards.) > >> > >> > > >> > please help . > >> > > >> > -- > >> > 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...@googlegroups.com. > >> > 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...@googlegroups.com <javascript:>. > > 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. For more options, visit https://groups.google.com/d/optout.