Hi Ahmad
I got a little further and although there's still no serial output on UART1, I at least now see an error message about it (on UART0 still).
ns16550_serial 3f215040.serial@xxxxxxxxxxx: probe failed: Device or resource busy
So your point about setting CONSOLE_ACTIVATE_NONE was correct 😊. Maybe I've missed something in the device trees, but am at least heartened to see something printed.
Thanks
John
-----Original Message-----
From: barebox <barebox-bounces@xxxxxxxxxxxxxxxxxxx> On Behalf Of Ahmad Fatoum
Sent: 02 June 2020 11:12
To: john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx <andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>; barebox@xxxxxxxxxxxxxxxxxxx
Subject: Re: Mini UART support for Raspberry Pi CM3 ?
On 6/2/20 11:57 AM, john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
> Hi Ahmad
>
> I have been using v2020.05 but I believe I had enabled all consoles so
> I'll try setting it to none and see how that goes.
This will only fix the use of UART0 as output. To use UART1, you'll need to set stdout-path = &uart1 like ab76f9d09d3b ("ARM: rpi: choose miniuart as
stdout") does.
Cheers
Ahmad
>
> Thanks
>
> John
>
> -----Original Message-----
> From: barebox <barebox-bounces@xxxxxxxxxxxxxxxxxxx> On Behalf Of Ahmad
> Fatoum
> Sent: 02 June 2020 10:55
> To: john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx
> <andrew@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx>; barebox@xxxxxxxxxxxxxxxxxxx
> Subject: Re: Mini UART support for Raspberry Pi CM3 ?
>
> On 6/2/20 11:43 AM, Ahmad Fatoum wrote:
>> On 6/2/20 11:14 AM, john@xxxxxxxxxxxxxxxxxxxxxxxxxxxxx wrote:
>>> Hi
>>>
>>> I have been trying to get the mini UART (UART1) to work in Barebox
>>> on the RPI Compute Module 3+. I already have the changes made in
>>> config.txt and this works fine when I boot into the main Linux code.
>>> However, in Barebox, the output always comes out on the main UART
>>> (UART0) and that is wired to the Bluetooth module on my platform. I
>>> have
> tried modifying the device
>>> trees and cannot seem to get any output. I also ensured that I added
> the
>>> RPI CM3 output target as a config in rpi_defconfig.
>>>
>>> I've tried turning off the PL011 config option and also changing the
>>> device tree to reference UART1 and set the chosen stdout-path to
>>> point to this UART, but when I do this I just get a lack of any
>>> serial
> output.
>>>
>>> I am also wanting to use the alternate pins (32 & 33) for UART1, so
>>> I am thinking that something else needs to be changed. Has anyone
>>> managed to get this to work?
>>
>> Which barebox version are you on? v2020.03.0 contains a series for
>> mini UART support culminating in ab76f9d09d3b ("ARM: rpi: choose
>> miniuart as stdout"), which sounds like something you will want to have.
>
> Oh, I see now that this is in since v2019.03.0. I assume you are
> already on a newer version?
>
>> Also what's you "Console activation strategy"? (Kconfig symbols
>> CONSOLE_ACTIVATE_.*) You'll want to have CONSOLE_ACTIVATE_NONE, so
>> only the stdout-path from the device tree is activated by default.
>>
>> Cheers
>> Ahmad
>>
>>>
>>> Regards
>>>
>>> John
>>>
>>>
>>> _______________________________________________
>>> barebox mailing list
>>> barebox@xxxxxxxxxxxxxxxxxxx
>>> http://lists.infradead.org/mailman/listinfo/barebox
>>>
>>
>
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