Question
X-CUBE-SBSFU for L4+
Posted on June 04, 2018 at 22:36
Hi.
I tried to port latest SBSFU to STM32L4+ line of MCUs using NUCLEO-L4R5ZI board.
I modified preprocessor macro to STM32L4R5xx and I found such problems:1. FLASH_PAGE_SIZE for L4+ is 0x1000, while for L4 it is 0x0800.
It produces following error:= [SBOOT] System Security Check successfully passed. Starting...= [FWIMG] Slot #0 @: 8080800 / Slot #1 @: 800e000 / Swap @: 80f2800= [FWIMG] slot 0 (8080800) is not properly aligned: please tune your settings= [FWIMG] swap region (80f2800) is not properly aligned: please tune your settings========= End of Execution ==========Fix is simple: aligning memory addresses of SLOT_0 and SWAP to 0x1000.When all protections are disabled (with SECBOOT_DISABLE_SECURITY_IPS defined) everything works fine.
Unfortunately when I tried to apply some protections I observed next two problems:
2. Inclusion of all protections resulted in linking problem: region `SB_ROM_region' overflowed by 728 bytes.3. With some protections disabled (SFU_MPU_PROTECT_ENABLE and SFU_TAMPER_PROTECT_ENABLE) it is possible to link SBSFU but rolling reset was observed.By experimenting I realized that enabling SFU_PCROP_PROTECT_ENABLE or SFU_FWALL_PROTECT_ENABLE causes rolling SBSFU reset.I'm still investigating those problems, but I'm interested if someone already ported SBSFU to L4+.
Regards