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From: Ahmad Fatoum <a.fatoum@pengutronix.de>
To: "Robert Carnecky (Neopsis)" <robert@neopsis.com>,
	barebox@lists.infradead.org
Subject: Re: Mini UART on RaspberryPi CM3/CM3+
Date: Mon, 5 Oct 2020 13:16:18 +0200	[thread overview]
Message-ID: <61631575-54f8-4fe1-4a25-a806b39f2a63@pengutronix.de> (raw)
In-Reply-To: <CABMENH487jhrwdywh4KOOqvJtJ_r0ZbSMu2ArDZRHhdK==-+wQ@mail.gmail.com>

Hello Robert,

On 10/5/20 12:07 PM, Robert Carnecky (Neopsis) wrote:
> Did anybody successfully configured Raspberry CM3/CM3+ mini-UART as
> the Barebox console? I found a thread
> on this list discussing the issue
> (https://www.mail-archive.com/barebox@lists.infradead.org/msg35235.html),
> unfortunately without any solution.
> 
> What I need:
> 
>    * UART0 on pins 32/33 (technology access over rs-485)
>    * UART1 (miniUART) on pins 14/15 (console)
> 
> My current config.txt boots fine my raspberry kernel (zImage built
> using builroot):
> 
>    kernel=zImage
>    enable_uart=1
>    dtoverlay=uart0,txd0_pin=32,rxd0_pin=33,pin_func=7
>    dtoverlay=uart1,txd1_pin=14,rxd1_pin=15
> 
> Now I would like to switch to Barebox as a bootloader. I compiled the
> barebox image with
> 
>    * CONSOLE_ACTIVATE_NONE = Y
>    * 'stdout-path=&uart1;' in  'arch/arm/dts/bcm2837-rpi-cm3.dts' .

I don't have a CM3, but are you sure uart1 is enabled?

Try adding to arch/arm/dts/bcm2837-rpi-cm3.dts:

&uart1 {
        pinctrl-names = "default";
        pinctrl-0 = <&uart1_gpio14>;
        status = "okay";
};

If that doesn't help, use CONSOLE_ACTIVATE_ALL and listen
on UART0 before the RS-485 transceiver and paste the
dmesg and devinfo input you get.

Cheers,
Ahmad


> 
> and changed my kernel in config.txt
> 
>     kernel=barebox.img
> 
> I cannot see any output on pins 14/15 e.g. UART1, no barebox console,
> no kernel console.
> Any idea what's wrong here?
> 
> Robert
> 
> _______________________________________________
> barebox mailing list
> barebox@lists.infradead.org
> http://lists.infradead.org/mailman/listinfo/barebox
> 

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  reply	other threads:[~2020-10-05 11:16 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-10-05 10:07 Robert Carnecky (Neopsis)
2020-10-05 11:16 ` Ahmad Fatoum [this message]
2020-10-09 12:30   ` Robert Carnecky (Neopsis)
2020-10-09 14:18     ` Ahmad Fatoum
2020-10-17 11:31       ` Robert Carnecky (Neopsis)
2020-10-17 21:29         ` Ahmad Fatoum
2020-10-17 23:17           ` Robert Carnecky (Neopsis)
2020-10-19  9:28             ` Ahmad Fatoum
2020-10-19 22:29               ` Robert Carnecky (Neopsis)
2020-10-20  3:59                 ` Rouven Czerwinski
2020-10-20  4:04                   ` Rouven Czerwinski
2020-10-20 12:22                     ` Robert Carnecky (Neopsis)
2020-10-20 12:45                       ` Rouven Czerwinski
2020-10-20 17:04                         ` Robert Carnecky (Neopsis)
2020-10-21  8:21                           ` Robert Carnecky (Neopsis)

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