console: add new $global.bootm.earlycon parameter

barebox already fixes up a suitable console= parameter if it can
determine one into the kernel command line. This doesn't help with early
Linux issues, which can instead be debugged by the earlycon mechanism.

For earlycon to work, the kernel DT must have a stdout-path or the user
needs to explicitly specify what driver to use and how to access it
(base address, optionally access_type).

Make this easier by just having barebox fix up the needed information
when $global.bootm.earlycon is true and the barebox serial driver
provides the needed information. If the serial driver doesn't, a plain
"earlycon" parameter will be fixed up.

Signed-off-by: Ahmad Fatoum <a.fatoum@pengutronix.de>
Link: https://lore.barebox.org/20220523092526.791716-1-a.fatoum@pengutronix.de
Signed-off-by: Sascha Hauer <s.hauer@pengutronix.de>

1 files changed, 2 insertions, 0 deletions

diff --git a/include/console.h b/include/console.h
index 5d5783ca66..7fea8eeb9e 100644
--- a/include/console.h
+++ b/include/console.h
@@ -53,6 +53,8 @@ struct console_device {
 	unsigned int baudrate_param;
 
 	const char *linux_console_name;
+	const char *linux_earlycon_name;
+	void __iomem *phys_base;
 
 	struct cdev devfs;
 	struct cdev_operations fops;