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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
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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10
arch/arm/include/asm/arch-stm32f4/stm32.h
View File

@ -14,6 +14,7 @@
/*
* Peripheral memory map
*/
#define STM32_SYSMEM_BASE 0x1FFF0000
#define STM32_PERIPH_BASE 0x40000000
#define STM32_APB1PERIPH_BASE (STM32_PERIPH_BASE + 0x00000000)
#define STM32_APB2PERIPH_BASE (STM32_PERIPH_BASE + 0x00010000)
@ -25,6 +26,12 @@
/*
* Register maps
*/
struct stm32_u_id_regs {
u32 u_id_low;
u32 u_id_mid;
u32 u_id_high;
};
struct stm32_rcc_regs {
u32 cr; /* RCC clock control */
u32 pllcfgr; /* RCC PLL configuration */
@ -78,6 +85,9 @@ struct stm32_flash_regs {
/*
* Registers access macros
*/
#define STM32_U_ID_BASE (STM32_SYSMEM_BASE + 0x7A10)
#define STM32_U_ID ((struct stm32_u_id_regs *)STM32_U_ID_BASE)
#define STM32_RCC_BASE (STM32_AHB1PERIPH_BASE + 0x3800)
#define STM32_RCC ((struct stm32_rcc_regs *)STM32_RCC_BASE)

19
board/st/stm32f429-discovery/stm32f429-discovery.c
View File

@ -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

1
include/configs/stm32f429-discovery.h
View File

@ -15,6 +15,7 @@
#define CONFIG_OF_LIBFDT
#define CONFIG_BOARD_EARLY_INIT_F
#define CONFIG_MISC_INIT_R
#define CONFIG_SYS_FLASH_BASE 0x08000000