[U-Boot] [PATCH] sunxi: Set the /chosen/stdout-path fdt property for sunxi boards

[Hans de Goede]

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 at 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 at 07000000:115200"
+#else
+#define OF_STDOUT_PATH		"/soc at 01c00000/serial at 01c28000:115200"
+#endif
+#elif CONFIG_CONS_INDEX == 2 && defined(CONFIG_MACH_SUN5I)
+#define OF_STDOUT_PATH		"/soc at 01c00000/serial at 01c28400:115200"
+#elif CONFIG_CONS_INDEX == 5 && defined(CONFIG_MACH_SUN8I)
+#define OF_STDOUT_PATH		"/soc at 01c00000/serial at 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
-- 
2.3.0