While discussing with some people how to get the Linux kernel to do the right thing wrt sending output to both the serial console and the hdmi out / lcd screen when booting on ARM devices, Grant Likely pointed out that there already is a solution for this.
All we need to do is set the /chosen/stdout-path fdt property, and if no console= arguments were specified on the kernel commandline the kernel will honor this and add this device as a console (next to the primary video output on hdmi).
And u-boot already has support for setting this, all we need to do is define OF_STDOUT_PATH and then everything will just work ootb, without people needing to meddle with adding console= arguments in extlinux.conf .
Signed-off-by: Hans de Goede hdegoede@redhat.com --- include/configs/sunxi-common.h | 14 ++++++++++++++ 1 file changed, 14 insertions(+)
diff --git a/include/configs/sunxi-common.h b/include/configs/sunxi-common.h index 20e11cf..cd02baf 100644 --- a/include/configs/sunxi-common.h +++ b/include/configs/sunxi-common.h @@ -263,6 +263,20 @@ extern int soft_i2c_gpio_scl; #define CONFIG_CONS_INDEX 1 /* UART0 */ #endif
+#if CONFIG_CONS_INDEX == 1 +#ifdef CONFIG_MACH_SUN9I +#define OF_STDOUT_PATH "/soc/serial@07000000:115200" +#else +#define OF_STDOUT_PATH "/soc@01c00000/serial@01c28000:115200" +#endif +#elif CONFIG_CONS_INDEX == 2 && defined(CONFIG_MACH_SUN5I) +#define OF_STDOUT_PATH "/soc@01c00000/serial@01c28400:115200" +#elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_MACH_SUN8I) +#define OF_STDOUT_PATH "/soc@01c00000/serial@01f02800:115200" +#else +#error Unsupported console port nr. Please fix stdout-path in sunxi-common.h. +#endif + /* GPIO */ #define CONFIG_SUNXI_GPIO #define CONFIG_SPL_GPIO_SUPPORT