[PATCH v4 1/2] rpi: set boot partition from devicetree

The Raspberry Pi has the "tryboot" feature where it can boot from a
different partition enabling failsafe A/B updates. After boot the
firmware sets 'partition' property in /chosen/bootloader.

Set the env variable boot_partition accordingly to allow boards to
create a bootcmd based on the boot partition.

Signed-off-by: Gregor Herburger <[email protected]>
Tested-by: Peter Robinson <[email protected]>
---
 board/raspberrypi/rpi/rpi.c | 15 +++++++++++++++
 1 file changed, 15 insertions(+)

diff --git a/board/raspberrypi/rpi/rpi.c b/board/raspberrypi/rpi/rpi.c
index 1da5df92351c..8354fec833cc 100644
--- a/board/raspberrypi/rpi/rpi.c
+++ b/board/raspberrypi/rpi/rpi.c
@@ -480,6 +480,20 @@ static void set_serial_number(void)
 	env_set("serial#", serial_string);
 }
 
+static void set_boot_partition_fdt(void)
+{
+	void *fdtp = (void *)gd->fdt_blob;
+	u32 partition;
+
+	partition = fdt_getprop_u32_default(fdtp, "/chosen/bootloader", "partition", 1);
+	if (!partition) {
+		printf("Failed to the get partition property.\n");
+		return;
+	}
+
+	env_set_ulong("boot_partition", partition);
+}
+
 int misc_init_r(void)
 {
 	set_fdt_addr();
@@ -489,6 +503,7 @@ int misc_init_r(void)
 	set_board_info();
 #endif
 	set_serial_number();
+	set_boot_partition_fdt();
 
 	return 0;
 }

-- 
2.47.3