[PATCH 1/4] arm: stm32mp: bsec: Update OTP shadow registers in SPL

Patrick Delaunay patrick.delaunay at foss.st.com
Mon Oct 11 09:52:48 CEST 2021

Currently the upper OTP (after 57) are shadowed in U-Boot proper,
when TFABOOT is not used.

This choice cause an issue when U-Boot is not executed after SPL,
so this BSEC initialization is moved in SPL and no more executed in U-Boot,
so it is still executed only one time.

After this patch this BSEC initialization is done in FSBL: SPL or TF-A.

To force this initialization in all the case, the probe of the BSEC
driver is forced in SPL in the arch st32mp function: spl_board_init().

Even if today BSEC driver is already probed in STM32MP15x clock driver
clk_stm32mp1.c because get_cpu_type() is called in
stm32mp1_get_max_opp_freq() function.

Reported-by: Alexandru Gagniuc <mr.nuke.me at gmail.com>
Signed-off-by: Patrick Delaunay <patrick.delaunay at foss.st.com>
It is updated version of proposed Alexandru patch:

[v2,06/11] arm: stm32mp: bsec: Update OTP shadow registers in SPL

 arch/arm/mach-stm32mp/bsec.c | 5 ++---
 arch/arm/mach-stm32mp/cpu.c  | 8 ++++++++
 2 files changed, 10 insertions(+), 3 deletions(-)

diff --git a/arch/arm/mach-stm32mp/bsec.c b/arch/arm/mach-stm32mp/bsec.c
index fe39bd80cf..e517acdd01 100644
--- a/arch/arm/mach-stm32mp/bsec.c
+++ b/arch/arm/mach-stm32mp/bsec.c
@@ -503,10 +503,9 @@ static int stm32mp_bsec_probe(struct udevice *dev)
 	 * update unlocked shadow for OTP cleared by the rom code
-	 * only executed in U-Boot proper when TF-A is not used
+	 * only executed in SPL, it is done in TF-A for TFABOOT
 		plat = dev_get_plat(dev);
 		for (otp = 57; otp <= BSEC_OTP_MAX_VALUE; otp++)
diff --git a/arch/arm/mach-stm32mp/cpu.c b/arch/arm/mach-stm32mp/cpu.c
index eb79f3ffd2..0263ffe96a 100644
--- a/arch/arm/mach-stm32mp/cpu.c
+++ b/arch/arm/mach-stm32mp/cpu.c
@@ -174,7 +174,15 @@ static void dbgmcu_init(void)
 void spl_board_init(void)
+	struct udevice *dev;
+	int ret;
+	/* force probe of BSEC driver to shadow the upper OTP */
+	ret = uclass_get_device_by_driver(UCLASS_MISC, DM_DRIVER_GET(stm32mp_bsec), &dev);
+	if (ret)
+		log_warning("BSEC probe failed: %d\n", ret);
 #endif /* !defined(CONFIG_SPL) || defined(CONFIG_SPL_BUILD) */

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