board: turris: Initialize serial# env
Store serial number from atsha cryptochip into the serial# env variable.
U-Boot automatically puts content of this variable into the root device
tree property serial-number when booting Linux kernel. Refactor turris
atsha code and from turris_atsha_otp_get_serial_number() function returns
directly string suitable for printing or storing into device tree. Because
during different boot stages is env storage read-only, it is not possible
to always store serial number into env storage. So introduce a new function
turris_atsha_otp_init_serial_number() which is called at later stage and
which ensures that serial number is correctly stored into env.
Signed-off-by: Pali Rohár <pali@kernel.org>
Reviewed-by: Marek Behún <kabel@kernel.org>
Reviewed-by: Stefan Roese <sr@denx.de>
diff --git a/board/CZ.NIC/turris_atsha_otp.h b/board/CZ.NIC/turris_atsha_otp.h
index bd4308f..2cfe20b 100644
--- a/board/CZ.NIC/turris_atsha_otp.h
+++ b/board/CZ.NIC/turris_atsha_otp.h
@@ -4,6 +4,7 @@
#define TURRIS_ATSHA_OTP_H
int turris_atsha_otp_init_mac_addresses(int first_idx);
-int turris_atsha_otp_get_serial_number(u32 *version_num, u32 *serial_num);
+int turris_atsha_otp_init_serial_number(void);
+int turris_atsha_otp_get_serial_number(char serial[17]);
#endif