From mboxrd@z Thu Jan 1 00:00:00 1970 From: Thomas Petazzoni Date: Thu, 9 Jun 2016 22:46:13 +0200 Subject: [Buildroot] [PATCH v2] raspberrypi3: fix serial console (load pi3-miniuart-bt overlay) In-Reply-To: <20160503210200.12d685a7@gmx.net> References: <1462220744-6368-1-git-send-email-ps.report@gmx.net> <871t5jr7e6.fsf@dell.be.48ers.dk> <20160503210200.12d685a7@gmx.net> Message-ID: <20160609224613.20512846@free-electrons.com> List-Id: MIME-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit To: buildroot@busybox.net Hello, On Tue, 3 May 2016 21:02:00 +0200, Peter Seiderer wrote: > This works too, not sure whats the better solution, explicit via device tree overlay > or some firmware magic.... > > - pi3-miniuart-bt 'dmesg | grep tty': > [ 0.000000] Kernel command line: 8250.nr_uarts=1 dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1920 bcm2708_fb.fbheight=1200 bcm2709.boardrev=0xa02082 bcm2709.serial=0xa60340 smsc95xx.macaddr=B8:27:EB:A6:03:40 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyAMA0,115200 > [ 0.001320] console [tty1] enabled > [ 0.318181] 3f215040.uart: ttyS0 at MMIO 0x3f215040 (irq = 59, base_baud = 50000000) is a 16550 > [ 2.008162] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2 > [ 3.296233] console [ttyAMA0] enabled > > - enable-uart=1, serial0 dmesg | grep tty': > [ 0.000000] Kernel command line: 8250.nr_uarts=1 dma.dmachans=0x7f35 bcm2708_fb.fbwidth=1920 bcm2708_fb.fbheight=1200 bcm2709.boardrev=0xa02082 bcm2709.serial=0xa60340 smsc95xx.macaddr=B8:27:EB:A6:03:40 bcm2708_fb.fbswap=1 bcm2709.uart_clock=48000000 vc_mem.mem_base=0x3dc00000 vc_mem.mem_size=0x3f000000 root=/dev/mmcblk0p2 rootwait console=tty1 console=ttyS0,115200 > [ 0.001318] console [tty1] enabled > [ 0.318270] console [ttyS0] disabled > [ 0.318389] 3f215040.uart: ttyS0 at MMIO 0x3f215040 (irq = 59, base_baud = 31250000) is a 16550 > [ 1.042714] console [ttyS0] enabled > [ 3.020277] 3f201000.uart: ttyAMA0 at MMIO 0x3f201000 (irq = 87, base_baud = 0) is a PL011 rev2 For the Buildroot defconfig, I believe passing enable-uart=1 in config.txt would be the easiest solution. Could you send a patch that does this instead of messing with the overlays ? Thanks! Thomas -- Thomas Petazzoni, CTO, Free Electrons Embedded Linux, Kernel and Android engineering http://free-electrons.com