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stm32f429: pass the device unique ID in DTB

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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
This commit is contained in:
Antonio Borneo
2015-07-19 22:19:46 +08:00
committed by Tom Rini
parent b0c8f4a797
commit 089fddfde2
3 changed files with 30 additions and 0 deletions
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19
board/st/stm32f429-discovery/stm32f429-discovery.c
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@@ -285,3 +285,22 @@ int board_init(void)
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