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1. Memory mapping[edit source]
The table below gives an overview of the BSEC OTP memory mapping with useful information in the context of this Wiki reading.
OTP words 0 to 31 are called lower OTP and words 32 to 95 are called upper OTP.
Further information for the words and fields that are not explicitly described here can be found in the reference
manual.
| OTP word | Bit field (size) | Name | Description |
|---|---|---|---|
| 0 | 31-7 (25 bits) | reserved | |
| 6 (1 bit) | is_closed |
| |
| 5-0 (6 bits) | reserved | ||
| 1-2 | See the reference manual | ||
| 3 | 31-30 (2 bits) | HSE value |
|
| 29-27 (3 bits) | primary boot source |
| |
| 26-24 (3 bits) | secondary boot source |
| |
| 23-16 (8 bits) | boot source disable | If different from zero each bit disables a boot source
| |
| 15 (1 bit) | data cache disabling |
| |
| 14-7 (8 bits) | UART instances disabling | If different from zero then each bit disables an UART instance:
| |
| 6 (1 bit) | USB DP pullup disabling |
| |
| 5 (1 bit) | PLL disabling |
| |
| 4-3 (2 bits) | SD card memory interface |
| |
| 2-1 (2 bits) | e•MMC™ memory interface |
| |
| 0 (1 bit) | QSPI non default AFmux |
| |
| 4 | 31-0 (32 bits) | monotonic counter | This is an anti rollback monotonic counter. On closed devices, the ROM code checks that it is less or equal to the one stored in the loaded image header.
|
1.1. OTP WORD 5 to 7 - AFmux configuration[edit source]
These three words contains AFmux settings that the ROM code applies in case of secure boot, after having applied the default AFmux settings of selected boot interfaces.
| Bit | Field | Size | Value | Description |
|---|---|---|---|---|
| 31-28 | port1[3:0] | 4 bits | Bank id | |
| 0 | unused | |||
| 1 | Bank A | |||
| 2 | Bank B | |||
| 3 | Bank C | |||
| 4 | Bank D | |||
| 5 | Bank E | |||
| 6 | Bank F | |||
| 7 | Bank G | |||
| 8 | Bank H | |||
| 9 | Bank I | |||
| 10 | Bank J | |||
| 11 | Bank K | |||
| 12 | Bank Z | |||
| 0b1111 | Invalid configuration | |||
| 27-24 | pin1[3:0] | 4 bits | 0-15 | Pin Id |
| 23-20 | afmux1[3:0] | 4 bits | 0-15 | AFmux value |
| 19-16 | mode1[3:0] | 4 bits | Pin Mode | |
| 0 | AF ; No Pull ; Low Speed | |||
| 1 | AF ; No Pull ; Medium Speed | |||
| 2 | AF ; No Pull ; High Speed | |||
| 3 | AF ; Pull Up ; Low Speed | |||
| 4 | AF ; Pull Up ; Medium Speed | |||
| 5 | AF ; Pull Up ; High Speed | |||
| 6 | AF ; Pull Down ; Low Speed | |||
| 7 | AF ; Pull Down ; Medium Speed | |||
| 8 | AF ; Pull Down ; High Speed | |||
| 9 | GPIO Output High | |||
| 10 | GPIO Output Low | |||
| 11 | GPIO Input | |||
| 12 | GPIO open drain ; No pull | |||
| 13 | GPIO open drain ; Pull Up | |||
| 14 | GPIO open drain ; Pull Down | |||
| 15 | GPIO analog mode | |||
| 15-12 | port0[3:0] | 4 bits | Bank id | |
| 0 | unused | |||
| 1 | Bank A | |||
| 2 | Bank B | |||
| 3 | Bank C | |||
| 4 | Bank D | |||
| 5 | Bank E | |||
| 6 | Bank F | |||
| 7 | Bank G | |||
| 8 | Bank H | |||
| 9 | Bank I | |||
| 10 | Bank J | |||
| 11 | Bank K | |||
| 12 | Bank Z | |||
| 0b1111 | Invalid configuration | |||
| 11-8 | pin0[3:0] | 4 bits | 0-15 | Pin Id |
| 7-4 | afmux0[3:0] | 4 bits | 0-15 | AFmux value |
| 3-0 | mode0[3:0] | 4 bits | Pin Mode | |
| 0 | AF ; No Pull ; Low Speed | |||
| 1 | AF ; No Pull ; Medium Speed | |||
| 2 | AF ; No Pull ; High Speed | |||
| 3 | AF ; Pull Up ; Low Speed | |||
| 4 | AF ; Pull Up ; Medium Speed | |||
| 5 | AF ; Pull Up ; High Speed | |||
| 6 | AF ; Pull Down ; Low Speed | |||
| 7 | AF ; Pull Down ; Medium Speed | |||
| 8 | AF ; Pull Down ; High Speed | |||
| 9 | GPIO Output High | |||
| 10 | GPIO Output Low | |||
| 11 | GPIO Input | |||
| 12 | GPIO open drain ; No pull | |||
| 13 | GPIO open drain ; Pull Up | |||
| 14 | GPIO open drain ; Pull Down | |||
| 15 | GPIO analog mode |
1.2. OTP WORD 8[edit source]
| Bit | Name | Size | Value | Description |
|---|---|---|---|---|
| 31-10 | 22 bits | reserved | ||
| 9 | SSP_SUCCESS | 1 bit | SSP is finished | |
| 0 | SSP is either not started or not finished. | |||
| 1 | SSP is finished. | |||
| 8 | SSP_REQ | 1 bit | SSP request | |
| 0 | SSP has never been requested. | |||
| 1 | SSP has been requested. | |||
| 7-0 | 8 bits | reserved |
1.3. OTP WORD 9 - NAND configuration[edit source]
| Bit | Name | Size | Value | Description |
|---|---|---|---|---|
| 31-31 | nand_param_stored_in_otp | 1 bit | FMC or serial NAND parameters storage flag | |
| 0b0 | NAND parameters are not stored here in OTP and are available via an ‘ONFI’ compliant get parameter command. | |||
| 0b1 | NAND parameters are stored here in OTP | |||
| 30-29 | nand_page_size[1:0] | 2 bits | FMC or serial NAND page size | |
| 0 | Page size is 2 Kbytes | |||
| 1 | Page size is 4 Kbytes | |||
| 2 | Page size is 8 Kbytes | |||
| 3 | reserved | |||
| 28-27 | nand_block_size[1:0] | 2 bits | FMC or serial NAND block size | |
| 0 | Block size is 64 pages | |||
| 1 | Block size is 128 pages | |||
| 2 | Block size is 256 pages | |||
| 3 | reserved | |||
| 26-19 | nand_blocks_nb[7:0] | 8 bits | FMC or serial NAND number of blocks | |
| N | Number of blocks of NAND in unit of 256 blocks (= N * 256 blocks) | |||
| 18-18 | fmc_nand_width | 1 bit | FMC NAND width | |
| 0 | FMC NAND is 8 bits | |||
| 1 | FMC NAND is 16 bits | |||
| 17-15 | fmc_ecc_bit_nb[2:0] | 3 bits | FMC NAND number of ECC bits | |
| 0 | No setting. In case on ONFI NAND, means ‘use value defined in parameter table’ | |||
| 1 | 1 bit ECC per 512 bytes, Hamming code | |||
| 2 | 4 bit ECC per 512 bytes of data, BCH (Bose, Chaudhuri and Hocquenghem) code | |||
| 3 | 8 bit ECC per 512 bytes of data, BCH (Bose, Chaudhuri and Hocquenghem) code | |||
| 4 | on-die ECC | |||
| 14 | spinand_need_plane_select | 1 bit | serial NAND need plane select | |
| 0 | serial NAND plane select not needed. | |||
| 1 | serial NAND plane select needed. | |||
| 13-4 | reserved | 10 bits | - | - |
| 3 | disable_ddr_power_optim | 1 bit | Disable DDR PLL switch off sequence | |
| 0 | DDR DLL switch off sequence enabled | |||
| 1 | DDR DLL switch off sequence disabled. | |||
| 2 | disable_hse_bypass_detect | 1 bit | Disable HSE bypass detection | |
| 0 | HSE bypass detection enabled. | |||
| 1 | HSE bypass detection disabled. | |||
| 1 | disable_hse_freq_detect | 1 bit | Disable HSE frequency autodetection | |
| 0 | HSE frequency autodetection enabled. | |||
| 1 | HSE frequency autodetection disabled. | |||
| 0 | disable_traces | 1 bit | Disable traces bit | |
| 0 | Bootrom trace are enabled. | |||
| 1 | Bootrom trace are disabled. |
1.4. OTP WORD 24 to 31 - Public Key Hash (PKH)[edit source]
OTP WORD 24 to 31 contain the SHA256 hash of ECDSA public key.
| OTP word | Bit | Field | Size | Description |
|---|---|---|---|---|
| 24 | 31-0 | pkh0[31:0] | 32 bits | Public Key Hash[31:0] |
| 25 | 31-0 | pkh1[31:0] | 32 bits | Public Key Hash[63:32] |
| 26 | 31-0 | pkh2[31:0] | 32 bits | Public Key Hash[95:64] |
| 27 | 31-0 | pkh3[31:0] | 32 bits | Public Key Hash[128:96] |
| 28 | 31-0 | pkh4[31:0] | 32 bits | Public Key Hash[159:128] |
| 29 | 31-0 | pkh5[31:0] | 32 bits | Public Key Hash[191:160] |
| 30 | 31-0 | pkh6[31:0] | 32 bits | Public Key Hash[223:192] |
| 31 | 31-0 | pkh7[31:0] | 32 bits | Public Key Hash[255:224] |
1.5. OTP WORD 56 - RMA password[edit source]
| Bit | Name | Size | Description |
|---|---|---|---|
| 31-30 | 2 bits | reserved | |
| 29-15 | rma_relock_passwd | 15 bits | Password required for RMA ReLock request |
| 14-0 | rma_passwd | 15 bits | Password required for RMA Unlock request |