STM32CubeProgrammer OTP management

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STM32CubeProgrammer can be used to read and update the OTP of the device which is seen as a partition on the device .

This page describes the format of the partition used by embedded programming service to allow OTP access by STM32CubeProgrammer (see AN5275: USB DFU/USART protocols used in STM32MP1 Series bootloaders for protocol details).

Refer to STM32CubeProgrammer article to know how to use the STM32CubeProgrammer that is the official STMicroelectronics tool for update OTP on STM32 platforms.

1 OTP partition[edit source]

The OTP partition is identified by the reserved Id 0xF2 and is exported as a specific alternate setting of the USB DFU ^[1].

This is used to access the STM32MP's on-chip one time programmable memory, and is only supported in U-Boot.

The OTP partition must be programmed without a header and must have a fixed size of 1024 bytes = 256 words (32 bits), following the structure described in chapter #Data Structure.

1.1 Access operation[edit source]

For read operation, the host requests the OTP partition data, and the platform replies with all the partition content (1024 bytes).

For write operation, the host needs to send the full structure containing one or more modifications. Each field is analyzed by the platform. First the OTP values are updated, then the OTP controls (such as lock) are updated.

After any write operation, a read must be done to update the Host information.

1.2 Data structure[edit source]

The data structure for the STM32MP15x Series is described in the table below.

Access can be RWS = Read / Write / Sticky

Word	Field name	Description	RWS
0	Version	Version of this structure	R
1	Configuration	Bit 8:7 TREAD[1:0]: set SAFMEM reading current level (default = 0b00) Bit 6:3 PRGWDTH[3:0] : SAFMEM programming pulse width (default = 0b0001) Bit 2:1 FRC[1:0]: SAFMEM CLOCK frequency range selection: 00: 10 MHz <= Freq <= 20 MHz 01: 20 MHz <= Freq <= 30 MHz 10: 30 MHz <= Freq <= 45 MHz 11: 45 MHz <= Freq <= 67 MHz Bit 0 PWRUP: SAFMEM power-up control 0: SAFMEM is powered down. 1: SAFMEM is powered up	RW
2	Reserved
3	Status	Bits 7 BIST2LOCK: BIST2 LOCKED 0: SAFMEM BIST2 is not locked 1: SAFMEM BIST2 is locked Bits 6 BIST1LOCK: BIST1 LOCKED 0: SAFMEM BIST1 is not locked 1: SAFMEM BIST1 is locked Bits 5 PWRON: SAFMEM Power Status 0: SAFMEM is in power off 1: SAFMEM is in power on note: used to poll pwrok signal value Bits 4 PROGFAIL: Last programming status 0: SAFMEM last programming was successful 1: SAFMEM last programming failed Bits 3 BUSY: SAFMEM operation status 0: SAFMEM is Idle 1: SAFMEM operation is on going note: bit polling is used to determine operation completion Bits 2 INVALID: OTP mode invalid 0: OTP mode is not OTP-INVALID 1: OTP mode is OTP-INVALID Bits 1 FULLDBG: OTP mode in full debug 0: OTP mode is OTP-OPEN1 1: OTP mode is OTP-OPEN2 Bits 0 SECURE: OTP mode secured 0: OTP mode is not OTP-SECURED 1: OTP mode is OTP-SECURED	R
4	General Lock conf	Bit4 GPLOCK: SAFMEM programming sticky lock 0: SAFMEM programming allowed 1: SAFMEM programming is disabled until the next system-reset Bit 3 FENREG feature enable register sticky lock 0: BSEC_FENABLE register is not locked 1: BSEC_FENABLE register is locked until the next system reset Bit 2 DENREG debug enable register sticky lock 0: BSEC_DENABLE register is not locked 1: BSEC_DENABLE register is locked until the next system reset Bit 1 : Reserved, must be kept at reset value. Bit 0 OTP: upper OTP region access: 0: not locked 1: Locked until the next system reset, when locked, the upper region OTP can not be read out from SAFMEM.	RWS
5	Debug conf	Bits 31:11 Reserved, must be kept at reset value. Bit 10 DBGSWENABLE: Control self-hosted debug enable with signal dbgswenable 0: memory-mapped accesses to all ETM registers are disabled and return error 1: no effect on external debugger accesses Bit 9 CFGDISABLE: Write access to secure GIC registers disable with signal: cfgsdisable 0: no effect, all GIC registers can be accessed 1: Disable write access to some Secure GIC registers Bit 8:7 CP15SDISABLE[1:0]: Write access to some secure Cortex-A7 CP15 registers is disabled CPDISABLE[0] applies to CPU0. CPDISABLE[1] applies to CPU1 0: All CP15 registers can be accessed 1: Disable write access to some secure CP15 registers into Cortex-A7 corresponding CPU Bit 6 SPNIDEN: Secure privilege non-invasive debug enable with signal spiden 0: Secure privilege non-invasive debug disabled 1: Secure privilege non-invasive debug enabled Bit 5 SPIDEN: Secure privilege invasive debug enable with signal spniden 0: Secure privilege invasive debug disabled 1: Secure privilege invasive debug enabled Bit 4 HDPEN: Hardware debug port enable with signal hdpen 0: Hardware debug port disabled 1: Hardware debug port enabled Bit 3 DEVICEEN: Controls the access to debug component via external debug port by signal deviceen 0: Disabled 1: Enabled Bit 2 NIDEN: Non-invasive debug enable with signal niden 0: Non-invasive debug disabled 1: Non-invasive debug enabled Bit 1 DBGEN: Debug enable with signal dbgen 0: Disabled 1: Enabled Bit 0 DFTEN: DFT enable with signal dften 0: DFT disabled 1: DFT enabled	RW
6	Reserved
7	Reserved
8	Disturbed status 1	Bit 31 : OTP 31 status ... Bit 0 : OTP 0 status	R
9	Disturbed status 2	Bit 31 : OTP 63 status ... Bit 0 : OTP 32 status	R
10	Disturbed status 3	Bit 31 : OTP 95 status ... Bit 0 : OTP 64 status	R
11	Reserved
12	Reserved
13	Reserved
14	Error status 1	Bit 31 : OTP 31 status ... Bit 0 : OTP 0 status	R
15	Error status 2	Bit 31 : OTP 63 status ... Bit 0 : OTP 32 status	R
16	Error status 3	Bit 31 : OTP 95 status ... Bit 0 : OTP 64 status	R
17	Reserved
18	Reserved
19	Reserved
20	Permanent lock 1	Bit 31 : OTP 31 permanent lock ... Bit 0 : OTP 0 permanent lock	RWS
21	Permanent lock 2	Bit 31 : OTP 63 permanent lock ... Bit 0 : OTP 32 permanent lock	RWS
22	Permanent lock 3	Bit 31 : OTP 95 Permanent lock ... Bit 0 : OTP 64 permanent lock	RWS
23	Reserved
24	Reserved
25	Reserved
26	Programming lock 1	Bit 31 : OTP 31 programming lock ... Bit 0 : OTP 0 programming lock	RWS
27	Programming lock 2	Bit 31 : OTP 63 programming lock ... Bit 0 : OTP 32 programming lock	RWS
28	Programming lock 3	Bit 31 : OTP 95 programming lock ... Bit 0 : OTP 64 programming lock	RWS
29	Reserved
30	Reserved
31	Reserved
32	Shadow write lock 1	Bit 31 : OTP 31 shadow write lock ... Bit 0 : OTP 0 shadow write lock	RWS
33	Shadow write lock 2	Bit 31 : OTP 63 shadow write lock ... Bit 0 : OTP 32 shadow write lock	RWS
34	Shadow write lock 3	Bit 31 : OTP 95 shadow write lock ... Bit 0 : OTP 64 shadow write lock	RWS
35	Reserved
36	Reserved
37	Reserved
38	Shadow read lock 1	Bit 31 : OTP 31 shadow read lock ... Bit 0 : OTP 0 shadow read lock	RWS
39	Shadow read lock 2	Bit 31 : OTP 63 shadow read lock ... Bit 0 : OTP 32 shadow read lock	RWS
40	Shadow read lock 3	Bit 31 : OTP 95 shadow read lock ... Bit 0 : OTP 64 shadow read lock	RWS
41	Reserved
42	Reserved
43	Reserved
44	OTP 0	Value of OTP 0	RW
45	OTP 1	Value of OTP 1	RW
...	OTP ...	Value of OTP ...	RW
139	OTP95	Value of OTP 95	RW
140	Reserved
...	Reserved
251	Reserved
252	Configuration register	Bit 7:4 ECC_USE[3:0]: 0x0: No 0x1: SAFMEM use ECC for upper OTP bits others: Reserved Bit 3:0 SAFMEM_SIZE[3:0]: 0x2: 2 Kbytes 0x4: 4 Kbytes 0x8: 8 Kbytes others: Reserved	R
253	IP version	Bit 7:4 MAJREV[3:0]: IP version major revision information Bit 3:0 MINREV[3:0]: IP version minor revision information	R
254	IP ID		R
255	IP_Magic_ID		R

2 Reference list[edit source]

↑ https://en.wikipedia.org/wiki/USB#Device_Firmware_Upgrade

[1] ttps://en.wikipedia.org/wiki/USB#Device_Firmware_Upgrade

[1]