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>

1 files changed, 4 insertions, 7 deletions

diff --git a/board/CZ.NIC/turris_omnia/turris_omnia.c b/board/CZ.NIC/turris_omnia/turris_omnia.c
index ab5061ef58..cf8a602670 100644
--- a/board/CZ.NIC/turris_omnia/turris_omnia.c
+++ b/board/CZ.NIC/turris_omnia/turris_omnia.c
@@ -963,19 +963,15 @@ int board_late_init(void)
 
 int show_board_info(void)
 {
-	u32 version_num, serial_num;
+	char serial[17];
 	int err;
 
-	err = turris_atsha_otp_get_serial_number(&version_num, &serial_num);
+	err = turris_atsha_otp_get_serial_number(serial);
 	printf("Model: Turris Omnia\n");
 	printf("  MCU type: %s\n", omnia_get_mcu_type());
 	printf("  MCU version: %s\n", omnia_get_mcu_version());
 	printf("  RAM size: %i MiB\n", omnia_get_ram_size_gb() * 1024);
-	if (err)
-		printf("  Serial Number: unknown\n");
-	else
-		printf("  Serial Number: %08X%08X\n", be32_to_cpu(version_num),
-		       be32_to_cpu(serial_num));
+	printf("  Serial Number: %s\n", !err ? serial : "unknown");
 
 	return 0;
 }
@@ -983,6 +979,7 @@ int show_board_info(void)
 int misc_init_r(void)
 {
 	turris_atsha_otp_init_mac_addresses(1);
+	turris_atsha_otp_init_serial_number();
 	return 0;
 }