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
> <[email protected]<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 <[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
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> > For more options, visit http://beagleboard.org/discuss
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