RE: Mini UART support for Raspberry Pi CM3 ?

["john@mobius-embedded-systems.co.uk" <andrew@mobius-embedded-systems.co.uk>]

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.

Thanks

John

-----Original Message-----
From: barebox <barebox-bounces@lists.infradead.org> On Behalf Of Ahmad
Fatoum
Sent: 02 June 2020 10:55
To: john@mobius-embedded-systems.co.uk
<andrew@mobius-embedded-systems.co.uk>; barebox@lists.infradead.org
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@mobius-embedded-systems.co.uk 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
>>
>>
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> 

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