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.
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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