About PieterG

PieterG · 2024-11-25

I am having trouble to get OBK data reading working on the STM32H562 / H563 (which do not support secure storage because they are lacking hardware crypto support).My plan is to store keys in the OBK area, (encrypted with some storage key of my own) a...

PieterG · 2024-10-24

Today, I suddenly experienced a bus fault on my stm32h563 which I traced down toDBGMCU->APB1FZR1 |= DBGMCU_APB1FZR1_DBG_IWDG_STOP;which I use to configure the watchdog to stop when the core has been halted by the debugger. fault status registers:SCB-...

PieterG · 2024-06-06

Should ICACHE be invalidated when a double ECC error occurs?

PieterG · 2024-06-06

In the FLASH_ECCDETR register, the ADDR_ECC field description contains:"The address in ADDR_ECC is relative to the flash memory area where the error occurred(user flash memory, system flash memory, data area, read-only/OTP area)."But I'm having troub...

PieterG · 2024-06-04

I'm trying to use the STM32H563 HASH peripheral to speed up sha256 calculations.The examples all use HAL_HASH_Start() to write the entire message at once.However, I'd like to feed chunks of data to the peripheral. The OEMiROT mbedtls sha256_alt drive...

PieterG · 2024-11-26

No, you are absolutely right, I just checked this again, and HDPStartSector/HDPEndSector are effectively hiding the specified flash sectors in HDPL2/3 even with TrustZone disabled.So HDP works without TrustZone being enabled.

PieterG · 2024-11-26

I have tested with Option Bytes HDPStartSector/HDPEndSector with TrustZone disabled, and I could still access 'hidden' sectors in HDPL3.As soon as I enabled TrustZone, it started to work, with the same Option Byte Params.I will doublecheck this to ma...

PieterG · 2024-11-26

option 2 to provide OBK data through a secure service turned out to be not a lot of work, so I went for that.Since we already had the TrustZone enabled in a minimalistic way, this was the quickest solution.Thanks Jocelyn!

PieterG · 2024-11-25

Thank you for your response Jocelyn.We cannot use the STM32H573 in this product because of its condiderably higher BOM price.TrustZone is probably not required to have HDP level OBK protection, but it is for flash sector HDP protection:I would prefer...

PieterG · 2024-11-15

That is exactly what I am doing, as you can see in the SCB->BFAR value in my busfault dump: 0x44024008 What I'm doing is the same as what the __HAL_DBGMCU_FREEZE_IWDG() macro does:#define __HAL_DBGMCU_FREEZE_IWDG() SET_BIT(DBGMCU->APB1FZR1, DBGMCU_AP...

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STM32H562 reading OBK in nonsecure application with TrustZone enabled

STM32H5 bus fault writing DBGMCU_APB1FZR1_DBG_IWDG_STOP

STM32H5 ECC errors and ICACHE invalidation

STM32H5 FLASH_ECCDETR address decoding

STM32H5 HASH peripheral chunk sizes

Re: STM32H562 reading OBK in nonsecure application with TrustZone enabled

Re: STM32H562 reading OBK in nonsecure application with TrustZone enabled

Re: STM32H562 reading OBK in nonsecure application with TrustZone enabled

Re: STM32H562 reading OBK in nonsecure application with TrustZone enabled

Re: STM32H5 bus fault writing DBGMCU_APB1FZR1_DBG_IWDG_STOP