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board: samsung: e850-96: Setup serial# env var

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Setup "serial#" environment variable from the chip ID. The chip ID is
read from Exynos850 SoC OTP (One Time Programmable) memory, which acts
like an EEPROM and contains unique SoC ID. This "serial#" variable is
further used for "fastboot devices" serial number, etc.

Signed-off-by: Sam Protsenko <semen.protsenko@linaro.org>
Signed-off-by: Minkyu Kang <mk7.kang@samsung.com>
This commit is contained in:
Sam Protsenko
2025-07-25 10:17:21 +09:00
committed by Minkyu Kang
parent ba713dd7d4
commit 34a6f585f0
1 changed files with 37 additions and 0 deletions
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board/samsung/e850-96/e850-96.c
+37
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@@ -4,9 +4,17 @@
* Author: Sam Protsenko <semen.protsenko@linaro.org>
*/
#include <env.h>
#include <init.h>
#include <mapmem.h>
#include <asm/io.h>
#include "fw.h"
/* OTP Controller base address and register offsets */
#define EXYNOS850_OTP_BASE 0x10000000
#define OTP_CHIPID0 0x4
#define OTP_CHIPID1 0x8
int dram_init(void)
{
return fdtdec_setup_mem_size_base();
@@ -17,6 +25,33 @@ int dram_init_banksize(void)
return fdtdec_setup_memory_banksize();
}
/* Read the unique SoC ID from OTP registers */
static u64 get_chip_id(void)
{
void __iomem *otp_base;
u64 val;
otp_base = map_sysmem(EXYNOS850_OTP_BASE, 12);
val = readl(otp_base + OTP_CHIPID0);
val |= (u64)readl(otp_base + OTP_CHIPID1) << 32UL;
unmap_sysmem(otp_base);
return val;
}
static void setup_serial(void)
{
char serial_str[17] = { 0 };
u64 serial_num;
if (env_get("serial#"))
return;
serial_num = get_chip_id();
snprintf(serial_str, sizeof(serial_str), "%016llx", serial_num);
env_set("serial#", serial_str);
}
int board_init(void)
{
return 0;
@@ -26,6 +61,8 @@ int board_late_init(void)
{
int err;
setup_serial();
/*
* Do this in board_late_init() to make sure MMC is not probed before
* efi_init_early().