IMXRT1170EVKB: Can I use spsdk + flashloader to execute code in external nor spi flash? Wrong fuses

[leviriley1]

I have been using spsdk to flash and program fuses on an imxrt1170EVKB
But I wrote the wrong fuse settings so it is now, incorrectly, looking for the qspi nor flash to be using the alternative pins.

Loading the fcb into ram this way does seem to work correctly as I can still flash the device but not boot as the memory is cleared on reset.

Can I use the spsdk and flashloader to start executing my firmware image from flash memory?

The following works up to the execute command, which doesn't error out but the device still does not boot.

My flash starts at 0x30000000, the fcb is stored from 0x30000400 to 0x30000600, and my image starts at 0x30001000

with McuBoot(self._interfaces[0], True) as mb:
    ####This is working ####
    # Fill memory with initial data self._logger.debug("fill memory") 
    mb.fill_memory(self.ROM_FCB_START, 4, 0xCF900001) 
    # Configure memory for FlexSPI NOR 
    mb.configure_memory(self.ROM_FCB_START, 9) 
    # Write the actual FCB to the 
    FlexSPI NOR memory self._logger.debug("write FlexSPI NOR FCB") 
    mb.write_memory(self.ROM_FCB_START, fcb_data)
    mb.configure_memory(self.ROM_FCB_START, 9)

    ###Can I have it execute code from flash?###

    jump_address = 0x30001000  # Starting address of your image in flash
    argument = 0x00000000      # Optional argument, use 0 if not needed
    stack_pointer = 0x00000000 # Set to 0 to let the code initialize it

    # Execute the code from flash (didn't work)
    mb.execute(jump_address, argument, stack_pointer)

Alternatively I may be able to boot from sdcard but would prefer to just run a python script to boot from flash as the project I am working on is booting from flash.

[Sam_Gao]

Hi,

'I wrote the wrong fuse settings',

would you please clarify more details about it?  you can use SPT or MCUBootUtility to get fuse data. 

[leviriley1]

Hi these are the fuses I accidentally wrote:

#fuses.append([22, 0x00000010, 0x00000010]) #setting BT_FUSE_SEL to 1: use fuses for boot configuration
#fuses.append([26, 0x00000400, 0x00000400]) #FLEXSPI_PIN_GROUP_SEL to 1: select secondary pin group

[Sam_Gao]

If the boot was done by wrong fuse, generally, it is not possible to randomly program eFuses more than one time, eFuses are the One Time Programmable (OTP) bits.