On 04/29/2016 12:06 PM, Taceant Omnes wrote:
On 29 April 2016 at 10:18, 'Florian Feldbauer' via BeagleBoard
<[email protected]> wrote:
Did I miss anything? I tried this with Kernel version 4.4.6-ti-r15 as well
as 4.4.8
I mounted the SD card and deleted the initrd.img-`uname -r` file. After
that, the BeagleBone was booting again.
But: Loading the BB-UART4-RS485 device tree overlay manually, I can now
receive data over the RS485 bus,
but I can no longer send data.
So it seems the OMAP driver is not working either. Actually now it is even
worse than before using the 8250 driver.
Sorry that it did not work.
What about trying a 4.1.x kernel as some people seem to have had
success with it? However I would suggest installing a Debian image
that comes with a 4.1 kernel rather than using a 4.1 kernel on your
current image. Last year I had a problem with some sort of systemd
incompatibility with a kernel when I upgraded a kernel whereby the BBB
would not boot.
I prepared a second SD card with an older Debian Jessie image,
which is using a 4.1 kernel.
I rebuild the kernel, making the same modifications as for the 4.4 kernel.
With the 4.1 Kernel, loading the RS485 overlay via uEnv.txt works, but
still the DE/!RE line does nothing.
BTW: some mails ago I included a schematic of my setup. I just realized
that there is a mistake in it. DE/!RE is of course connected to P9-27
and not
to P9-25 as drawn in the picture.
I actually checked it now several times, that I have it correctly wired :D
Florian
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