stm32f429: pass the device unique ID in DTB
Read device unique ID and set environment variable "serial#".
Value would then be passed to kernel through DTB.
To read ID from DTB, kernel is required to have commit:
3f599875e5202986b350618a617527ab441bf206 (ARM: 8355/1: arch: Show
the serial number from devicetree in cpuinfo)
This commit is already mainline since v4.1-rc1.
Signed-off-by: Antonio Borneo <borneo.antonio@gmail.com>
To: Albert Aribaud <albert.u.boot@aribaud.net>
To: Tom Rini <trini@konsulko.com>
To: Kamil Lulko <rev13@wp.pl>
Cc: u-boot@lists.denx.de
diff --git a/board/st/stm32f429-discovery/stm32f429-discovery.c b/board/st/stm32f429-discovery/stm32f429-discovery.c
index 2dd5d93..f418186 100644
--- a/board/st/stm32f429-discovery/stm32f429-discovery.c
+++ b/board/st/stm32f429-discovery/stm32f429-discovery.c
@@ -285,3 +285,22 @@
return 0;
}
+
+#ifdef CONFIG_MISC_INIT_R
+int misc_init_r(void)
+{
+ char serialno[25];
+ uint32_t u_id_low, u_id_mid, u_id_high;
+
+ if (!getenv("serial#")) {
+ u_id_low = readl(&STM32_U_ID->u_id_low);
+ u_id_mid = readl(&STM32_U_ID->u_id_mid);
+ u_id_high = readl(&STM32_U_ID->u_id_high);
+ sprintf(serialno, "%08x%08x%08x",
+ u_id_high, u_id_mid, u_id_low);
+ setenv("serial#", serialno);
+ }
+
+ return 0;
+}
+#endif