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From: "john@mobius-embedded-systems.co.uk" <andrew@mobius-embedded-systems.co.uk>
To: barebox@lists.infradead.org
Subject: Mini UART support for Raspberry Pi CM3 ?
Date: Tue, 2 Jun 2020 10:14:12 +0100	[thread overview]
Message-ID: <00a601d638be$2f10f330$8d32d990$@mobius-embedded-systems.co.uk> (raw)

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?

Regards

John


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             reply	other threads:[~2020-06-02  9:14 UTC|newest]

Thread overview: 7+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-06-02  9:14 john@mobius-embedded-systems.co.uk [this message]
2020-06-02  9:43 ` Ahmad Fatoum
2020-06-02  9:54   ` Ahmad Fatoum
2020-06-02  9:57     ` john@mobius-embedded-systems.co.uk
2020-06-02 10:11       ` Ahmad Fatoum
2020-06-03 22:14         ` john@mobius-embedded-systems.co.uk
2020-06-04  6:22           ` Ahmad Fatoum

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