Hi Martin,
On Tue, Apr 05, 2016 at 09:08:54AM +0200, Martin Bergek wrote:
> With the Raspberry Pi 3 the serial ports ttyS0 and ttyAMA0 have been switched
> around. This causes an issue with the serial console that has previously been
> set to ttyAMA0, causing the boot process to halt. I have a 100% failure rate
> when booting a Raspberry Pi 3 image built using the master branch of
> meta-raspberrypi. After a lot of testing it appears that the system fails to
> boot whenever the kernel command line specifies a console - regardless of
> whether it is ttyAMA0 or ttyS0.
>
> This patch changes the serial console and kernel command line to use default
> values, allowing the raspberrypi3 machine configuration to assign different
> values and to remove the kernel console. Now I get the console output to the
> screen but at least it boots. Not sure if this is an acceptable way of doing
> it but it fixed my problem.
>
> This patch has been verified on both the 4.1 and 4.4 kernel. It has also been
> tested with the raspberrypi2 machine configuration.
>
> Signed-off-by: Martin Bergek <martin at spotwise.com>
> ---
> conf/machine/include/rpi-base.inc | 2 +-
> conf/machine/raspberrypi3.conf | 4 ++++
> recipes-kernel/linux/linux-raspberrypi.inc | 2 +-
> 3 files changed, 6 insertions(+), 2 deletions(-)
>
> diff --git a/conf/machine/include/rpi-base.inc
> b/conf/machine/include/rpi-base.inc
> index 792150e..5d6280b 100644
> --- a/conf/machine/include/rpi-base.inc
> +++ b/conf/machine/include/rpi-base.inc
> @@ -7,7 +7,7 @@ include conf/machine/include/soc-family.inc
>
> IMAGE_FSTYPES ?= "tar.bz2 ext3 rpi-sdimg"
>
> -SERIAL_CONSOLE = "115200 ttyAMA0"
> +SERIAL_CONSOLE ?= "115200 ttyAMA0"
>
> XSERVER = " \
> xserver-xorg \
> diff --git a/conf/machine/raspberrypi3.conf b/conf/machine/raspberrypi3.conf
> index 1b73f2f..2c76dc2 100644
> --- a/conf/machine/raspberrypi3.conf
> +++ b/conf/machine/raspberrypi3.conf
> @@ -6,4 +6,8 @@ MACHINEOVERRIDES = "raspberrypi2:${MACHINE}"
>
> MACHINE_EXTRA_RRECOMMENDS += "linux-firmware-brcm43430"
>
> +# Change serial console due to swapped ttyAMA0 and ttyS0 on the Raspberry Pi
> 3
> +SERIAL_CONSOLE = "115200 ttyS0"
> +CMDLINE = "dwc_otg.lpm_enable=0 root=/dev/mmcblk0p2 rootfstype=ext4 rootwait"
> +
> include conf/machine/raspberrypi2.conf
> diff --git a/recipes-kernel/linux/linux-raspberrypi.inc
> b/recipes-kernel/linux/linux-raspberrypi.inc
> index 24e7fe2..a3fe61a 100644
> --- a/recipes-kernel/linux/linux-raspberrypi.inc
> +++ b/recipes-kernel/linux/linux-raspberrypi.inc
> @@ -20,7 +20,7 @@ KERNEL_DEFCONFIG_raspberrypi ?= "bcmrpi_defconfig"
> KERNEL_DEFCONFIG_raspberrypi2 ?= "bcm2709_defconfig"
>
> # CMDLINE for raspberrypi
> -CMDLINE = "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 root=/dev/mmcblk0p2
> rootfstype=ext4 rootwait"
> +CMDLINE ?= "dwc_otg.lpm_enable=0 console=ttyAMA0,115200 root=/dev/mmcblk0p2
> rootfstype=ext4 rootwait"
>
> # Add the kernel debugger over console kernel command line option if enabled
> CMDLINE_append = ' ${@base_conditional("ENABLE_KGDB", "1",
> "kgdboc=ttyAMA0,115200", "", d)}'This issue was fixed in master using serial0 magic string and the new firmware. This will unlock your serial console. Be aware that you will need to use enable_uart to force core_freq. Cheers! -- Andrei Gherzan
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