From mboxrd@z Thu Jan 1 00:00:00 1970 Return-path: Received: from mail-io1-xd43.google.com ([2607:f8b0:4864:20::d43]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kQrXY-0000Xz-2Z for barebox@lists.infradead.org; Fri, 09 Oct 2020 12:30:29 +0000 Received: by mail-io1-xd43.google.com with SMTP id l8so9828137ioh.11 for ; Fri, 09 Oct 2020 05:30:25 -0700 (PDT) MIME-Version: 1.0 References: <61631575-54f8-4fe1-4a25-a806b39f2a63@pengutronix.de> In-Reply-To: <61631575-54f8-4fe1-4a25-a806b39f2a63@pengutronix.de> From: "Robert Carnecky (Neopsis)" Date: Fri, 9 Oct 2020 14:30:12 +0200 Message-ID: List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "barebox" Errors-To: barebox-bounces+u.kleine-koenig=pengutronix.de@lists.infradead.org Subject: Re: Mini UART on RaspberryPi CM3/CM3+ To: barebox@lists.infradead.org > Try adding to arch/arm/dts/bcm2837-rpi-cm3.dts: > > &uart1 { > pinctrl-names = "default"; > pinctrl-0 = <&uart1_gpio14>; > status = "okay"; > }; I extended arch/arm/dts/bcm2837-rpi-cm3.dts as advised + additionally I set UART0 to pins 32/33. &uart0 { pinctrl-names = "default"; pinctrl-0 = <&uart0_gpio32>; status = "okay"; }; I still cannot see Barebox console on boot, however, the Barebox loader starts in 3 seconds my kernel and I get the Linux console output on UART1/ttyS0. Now my Linux boots as expected, unfortunately without visible Barebox console. I tried all Barebox console setting (NONE/ALL/FIRST), same result, no Barebox console output on UART0 or UART1. > 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. # dmesg | grep tty [ 0.000000] Kernel command line: console=ttyS0,115200 coherent_pool=1M snd_bcm2835.enable_compat_alsa=0 snd_bcm2835.enable_hdmi=1 snd_bcm2835.enable_headphones=1 8250.nr_uarts=1 bcm2708_fb.fbwidth=656 bcm2708_fb.fbheight=416 bcm2708_fb.fbswap=1 smsc95xx.macaddr=B8:27:EB:C5:7D:E3 vc_mem.mem_base=0x3ec00000 vc_mem.mem_size=0x40000000 root=/dev/mmcblk0p2 console=ttyS0,115200 rootfstype=ext4 elevator=deadline rootwait [ 1.289058] printk: console [ttyS0] disabled [ 1.289175] 3f215040.serial: ttyS0 at MMIO 0x0 (irq = 53, base_baud = 50000000) is a 16550 [ 1.945483] printk: console [ttyS0] enabled [ 2.432604] 3f201000.serial: ttyAMA0 at MMIO 0x3f201000 (irq = 81, base_baud = 0) is a PL011 rev2 # stty -F /dev/ttyAMA0 115200 # cat /etc/inittab > /dev/ttyAMA0 <- OK Robert On Mon, Oct 5, 2020 at 1:16 PM Ahmad Fatoum wrote: > > 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 > > > > -- > Pengutronix e.K. | | > Steuerwalder Str. 21 | http://www.pengutronix.de/ | > 31137 Hildesheim, Germany | Phone: +49-5121-206917-0 | > Amtsgericht Hildesheim, HRA 2686 | Fax: +49-5121-206917-5555 | _______________________________________________ barebox mailing list barebox@lists.infradead.org http://lists.infradead.org/mailman/listinfo/barebox