HardFault in STM32H7 OTA

[roblahnst]

Board is a NUCLEO-H753ZI, CubeIDE 1.16.1, Mongoose version is the latest.
My firmware.bin size is 272.088 Byte.

I get a Hardfault in mongoose.c:468 if (len_aligned_down) ok = flash->write_fn(s_addr, buf, len_aligned_down);

s_addr = 0x8100000, buf=0x2400c350 and len_aligned_down = 512.

• I already tried to deactivate the MPU.
• I can write the firmware with MXProgrammer in 0x8100000 without any problem.
• I tried to do a HAL_FLASH_Lock(); and then HAL_FLASH_Unlock(); before the OTA.

In the Hardfault I find:
CFSR = 0x00000400
HFSR = 0x40000000
MMFAR = 0x00000000
BFAR = 0x00000000
stacked_pc = 0x0804031C
R0 = 0x52002100
R1 = 0x00000010
R2 = 0x45524f53
R3 = 0x52002004
R12 = 0xA0000000
LR = 0x0804073F
PSR = 0x21000000

So, it seems to be a Precise Data Bus Error.

• I made a small test program with HAL_FLASH_Program() to write some data into 0x8100000 and no problem.

I hope someone can help me.

[scaprile]

Where did you get the code from ?
Where did you get the Cube project from ?
What is your config ? What's in mongoose_config.h ?
Why are you talking about the MPU ? Did we enable the MPU in the Cube project ? It is not a Memory Management Fault anyway
Why are you talking about Cube HAL functions, Mongoose does not use Cube HAL functions
Can you please explain what you are doing with what, because I can't guess which one of the thousands of possibilities you are facing. The only thing I can guess is that you are trying to do OTA on a NUCLEO-H753ZI with some code that happens to include Mongoose "latest", where "latest" is not defined, could it be HEAD ? could it be latest release 7.17 ?
Your registers are useless without the ELF, because I can't guess what function is at 0x0804031C; presumably what you post above.

Please see our documentation, and follow the guidelines in our tutorials.

Our examples are working and have been tested. Please see what we do, do what we do, use our wizard, try our code examples and tutorials, work your way from them, don't enable things we don't enable (that includes caches), enable things we enable.
https://mongoose.ws/documentation/#nucleo-h753zi
Thank you.

PS:
FORCED error
if (bfsr & (1 << 2)) IMPRECISE error, so it doesn't seem precise to me, if i didn't overlook something.
It is an M7, you also have ABFSR: SCB->ABFSR
*((uint32_t *)0xE000E008) |= (1<<1); // Disable write buffering so IMPRECISE hard faults may become PRECISE; I don't remember if that also works for M7, it does for M4