Re: [beagleboard] Re: UART5 not working on Beaglebone Black

2017-05-24 Thread Graham Haddock 
Let's start with a few clues.

What board and revision level are you using?  (example: BeagleBone Black,
Rev C.)

What OS, version, release date and kernel are you using?

What other changes, if any, have you made to the system software?

What hardware / I-O do you have plugged into the accessory connectors?

Do you have a serial debug cable plugged in?  Is it giving you any boot
errors or conflicts?

==

Why are you planning to mess with I2C-1 ?  On Debian jessie, that is an
internal control bus you should not touch, unless you really know what you
are doing.


I suspect that:
BB-BONELT-HDMI,BB-BONELT-HDMIN
only disables the HDMI, not the LCD drivers, and you should only disable
the HDMI once, not twice.

I am guessing that you still need to disable the LCD drivers.


--- Graham


---



On Wed, May 24, 2017 at 10:04 AM,  wrote:

> I tried uncommenting the lines in /boot/uEnv.txt about disabling HDMI, but
> it did not help. I also tried typing in
> *optargs=capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART3,BB-UART5* at
> the end of that file.
> Then I was trying to type optargs=quiet 
> capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN
> in order to explicitly disable the HDMI in the /boot/uEnv.txt, but it
> didn't help either.
>
> It appears that HDMI is not enabled there whatsoever since in the slots
> file I don't have anything dedicated to it:
> *root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots*
> * 0: PF  -1*
> * 1: PF  -1*
> * 2: PF  -1*
> * 3: PF  -1*
> * 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-I2C1*
> * 6: P-O-L-   1 Override Board Name,00A0,Override Manuf,BB-UART1*
> * 7: P-O-L-   2 Override Board Name,00A0,Override Manuf,BB-UART2*
> * 8: P-O-L-   3 Override Board Name,00A0,Override Manuf,BB-UART4*
> * 9: P-O-L-   4 Override Board Name,00A0,Override Manuf,BB-UART5*
> *10: P-O-L-   5 Override Board Name,00A0,Override Manuf,BB-UART3*
>
> Are there any other possible sources of UART5 not working, aside from it
> interfering with HDMI? I tried several different boards and SD cards, but
> the port did not work on any of them.
>
>
>
> On Monday, May 22, 2017 at 9:47:08 PM UTC-4, Graham wrote:
>>
>> The IO pins used by UART5 are, by default, assigned to driving an LCD
>> screen.
>> You will need to reconfigure the IO, so that LCD/video is disabled, and
>> the pins are re-assigned as UART I/O pins.
>> You will need to modify the boot file and device tree.
>> Start searching about how to edit the /boot/uEnv.text file, and your
>> different options for re-configuring the necessary pins.
>>
>> --- Graham
>>
>> ==
>>
>> On Monday, May 22, 2017 at 8:04:06 PM UTC-5, sspo...@bu.edu wrote:
>>>
>>> I am using a Beaglebone Black on a student project. In order to activate
>>> the UART5 port, I type in “echo BB-UART5 > 
>>> /sys/devices/platform/bone_capemgr/slots”
>>> every time I power the board on. However, even though the port does seem to
>>> be activated, uart5 never works for any of the BBB’s I try (other UART
>>> ports on them work as well as usual) . What can cause such problems
>>> specifically with UART5? How can I fix it?
>>>
>> --
> For more options, visit http://beagleboard.org/discuss
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[beagleboard] Re: UART5 not working on Beaglebone Black

2017-05-24 Thread ssposnov 
I tried uncommenting the lines in /boot/uEnv.txt about disabling HDMI, but 
it did not help. I also tried typing in 
*optargs=capemgr.enable_partno=BB-UART1,BB-UART2,BB-UART3,BB-UART5* at the 
end of that file.
Then I was trying to type optargs=quiet 
capemgr.disable_partno=BB-BONELT-HDMI,BB-BONELT-HDMIN in order to 
explicitly disable the HDMI in the /boot/uEnv.txt, but it didn't help 
either.

It appears that HDMI is not enabled there whatsoever since in the slots 
file I don't have anything dedicated to it:
*root@beaglebone:~# cat /sys/devices/platform/bone_capemgr/slots*
* 0: PF  -1*
* 1: PF  -1*
* 2: PF  -1*
* 3: PF  -1*
* 4: P-O-L-   0 Override Board Name,00A0,Override Manuf,BB-I2C1*
* 6: P-O-L-   1 Override Board Name,00A0,Override Manuf,BB-UART1*
* 7: P-O-L-   2 Override Board Name,00A0,Override Manuf,BB-UART2*
* 8: P-O-L-   3 Override Board Name,00A0,Override Manuf,BB-UART4*
* 9: P-O-L-   4 Override Board Name,00A0,Override Manuf,BB-UART5*
*10: P-O-L-   5 Override Board Name,00A0,Override Manuf,BB-UART3*

Are there any other possible sources of UART5 not working, aside from it 
interfering with HDMI? I tried several different boards and SD cards, but 
the port did not work on any of them.



On Monday, May 22, 2017 at 9:47:08 PM UTC-4, Graham wrote:
>
> The IO pins used by UART5 are, by default, assigned to driving an LCD 
> screen.
> You will need to reconfigure the IO, so that LCD/video is disabled, and 
> the pins are re-assigned as UART I/O pins.
> You will need to modify the boot file and device tree.
> Start searching about how to edit the /boot/uEnv.text file, and your 
> different options for re-configuring the necessary pins.
>
> --- Graham
>
> ==
>
> On Monday, May 22, 2017 at 8:04:06 PM UTC-5, sspo...@bu.edu wrote:
>>
>> I am using a Beaglebone Black on a student project. In order to activate 
>> the UART5 port, I type in “echo BB-UART5 > 
>> /sys/devices/platform/bone_capemgr/slots” every time I power the board on. 
>> However, even though the port does seem to be activated, uart5 never works 
>> for any of the BBB’s I try (other UART ports on them work as well as usual) 
>> . What can cause such problems specifically with UART5? How can I fix it?
>>
>

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[beagleboard] Re: UART5 not working on Beaglebone Black

2017-05-22 Thread Graham 
The IO pins used by UART5 are, by default, assigned to driving an LCD 
screen.
You will need to reconfigure the IO, so that LCD/video is disabled, and the 
pins are re-assigned as UART I/O pins.
You will need to modify the boot file and device tree.
Start searching about how to edit the /boot/uEnv.text file, and your 
different options for re-configuring the necessary pins.

--- Graham

==

On Monday, May 22, 2017 at 8:04:06 PM UTC-5, sspo...@bu.edu wrote:
>
> I am using a Beaglebone Black on a student project. In order to activate 
> the UART5 port, I type in “echo BB-UART5 > 
> /sys/devices/platform/bone_capemgr/slots” every time I power the board on. 
> However, even though the port does seem to be activated, uart5 never works 
> for any of the BBB’s I try (other UART ports on them work as well as usual) 
> . What can cause such problems specifically with UART5? How can I fix it?
>

-- 
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