ARM: Parse command line delivered by U-Boot:

- in atags
- in DT blob (by using 'fdt chosen' U-Boot command)

The command line must start with guard's string 'FreeBSD:' and can contain
list of comma separated kenv strings. Also, boot modifier strings from
boot.h are recognised and parsed into boothowto.

The command line must be passed from U-Boot by setting of bootargs variable:
'setenv bootargs FreeBSD:boot_single=1,vfs.root.mountfrom=ufs:/dev/ada0s1a'
followed by 'fdt chosen' (only for DT based boot)

1 files changed, 13 insertions, 0 deletions

diff --git a/sys/dev/fdt/fdt_common.c b/sys/dev/fdt/fdt_common.c
index 6211aca7a01a..73f7ada5771e 100644
--- a/sys/dev/fdt/fdt_common.c
+++ b/sys/dev/fdt/fdt_common.c
@@ -722,3 +722,16 @@ fdt_get_unit(device_t dev)
 
 	return (strtol(name,NULL,0));
 }
+
+int
+fdt_get_chosen_bootargs(char *bootargs, size_t max_size)
+{
+	phandle_t chosen;
+
+	chosen = OF_finddevice("/chosen");
+	if (chosen == -1)
+		return (ENXIO);
+	if (OF_getprop(chosen, "bootargs", bootargs, max_size) == -1)
+		return (ENXIO);
+	return (0);
+}
\ No newline at end of file