On Thu, May 8, 2014 at 5:54 AM, Samer Shatta <[email protected]> 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 <[email protected]> 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 [email protected]. >> > 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 [email protected]. > 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 [email protected]. For more options, visit https://groups.google.com/d/optout.
