About 980nm

980nm · 2024-08-02

Hi,When trying to run a simple TrustZone+UART project generated by STM32CubeMX, the chip raises a HardFault when switching to NonSecure mode. In the HardFault handler, the Cortex-M33 CFSR registrer is set to 0x400, indicating an instruction bus error...

980nm · 2024-08-09

Sorry for the delay. I'm running STM32CubeMX version 6.12.0, with device package version 1.5.1 for L5, and 1.6.0 for U5. (I did hand-edit the L5 IOC file, as I have an the Nucleo-144 but with a STM32L562 swapped in with some hand-soldering. So I edit...

980nm · 2024-08-07

After more digging:It's actually technically a BusFault, I just didn't have the handler enabled in SCB_SHCSR. Doesn't change much about the origin.the GTZC reports an illegal access on SRAM 5 (which is where the NS stack lives). This is weird, as it ...

980nm · 2024-08-07

After some more mucking around, I'm also getting the issue on a fresh STM32U5A5 Nucleo-144 devboard. I've made care to disable Secure Area 2 in STM32CubeProgrammer (SECWM2_PSTRT=0xff, SECWM2_PEND=0) yet that also doesn't resolve the issue. SAU_SFSR i...

980nm · 2024-07-19

hm, I checked and double-checked all of those (and even rewrote my code to use the PKA HAL lib instead of the LL access) and the results I'm getting are still nonsense.Could it be that the PKA has stringent power supply requirements? I'm currently mo...

980nm · 2024-07-16

Hi, could you please elaborate on what the exact hardware issue was? I'm noticing similar issues when trying to use the PKA myself, so I'm wondering if I'm seeing the same sort of effects here.

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HardFault when changing from Secure to NonSecure mode on STM32L552/562 and STM32U5A5

Re: HardFault when changing from Secure to NonSecure mode on STM32L552/562 and STM32U5A5

Re: HardFault when changing from Secure to NonSecure mode on STM32L552/562 and STM32U5A5

Re: HardFault when changing from Secure to NonSecure mode on STM32L552/562 and STM32U5A5

Re: PKA Modular Exponentiation not working as expected

Re: PKA Modular Exponentiation not working as expected