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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next prev parent 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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