[PATCH] Pass barebox version to kernel

[Sascha Hauer]

When userspace is interested in the barebox version it has currently no
way of reliably reading it. Add it to the kernel command line as it's an
established way to pass information from the bootloader to the kernel.
If CONFIG_FLEXIBLE_BOOTARGS is enabled then the barebox version is
passed in the "bootloader.version=" variable.

Signed-off-by: Sascha Hauer <s.hauer at pengutronix.de>
---
 common/globalvar.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/common/globalvar.c b/common/globalvar.c
index b9bfce7dac..eff4cbc72e 100644
--- a/common/globalvar.c
+++ b/common/globalvar.c
@@ -571,6 +571,8 @@ int globalvar_add_simple_ip(const char *name, IPaddr_t *ip)
 	return 0;
 }
 
+static char *kernel_arg_bootloader_version;
+
 static int globalvar_init(void)
 {
 	register_device(&global_device);
@@ -580,6 +582,13 @@ static int globalvar_init(void)
 
 	globalvar_add_simple("version", UTS_RELEASE);
 
+	if (IS_ENABLED(CONFIG_FLEXIBLE_BOOTARGS)) {
+		kernel_arg_bootloader_version = basprintf("bootloader.version=barebox-%s",
+					       UTS_RELEASE);
+		globalvar_add_simple_string("linux.bootargs.bootloader.version",
+					    &kernel_arg_bootloader_version);
+	}
+
 	return 0;
 }
 pure_initcall(globalvar_init);
-- 
2.16.1