Compiler/CC3220MODA: How to prevent the erase of an internal flash memory region during the OTA process ?

Jesus Martinez

Part Number: CC3220MODA
Other Parts Discussed in Thread: CC3220SF

Tool/software: TI C/C++ Compiler

I created an internal flash region (FLASH_W) to save some data during code execution, to do so I have configured the CC3220SF_LAUNCHXL_TIRTOS.cmd as explained in

Just as follows:

MEMORY
{
    /* Bootloader uses FLASH_HDR during initialization */
    FLASH_HDR (RX)  : origin = 0x01000000, length = 0x7FF      /* 2 KB */
    FLASH     (RX)  : origin = 0x01000800, length = 0x0BF800   /* 766KB */
    FLASH_W   (RWX) : origin = 0x010C0000, length = 0x40000    /* 256KB */
    
    SRAM      (RWX) : origin = 0x20000000, length = 0x00040000 /* 256KB */
}

It's working well, but just after the OTA process was completed, the whole internal flash gets erased (after the system reboot), as a result of I lost all my stored data in the FLASH_W region, Is there any way to prevent this to happen?

Thanks in advance.

over 6 years ago

0 Vincent Rodriguez over 6 years ago

TI__Mastermind 28285 points

Jesus,

Unfortunately no. This is part of the OTA security features and the reason is to ensure your entire code base is secure (No unknown code located in a section of memory)

I would suggest a few things: first, you could move all your saved data to a file in the serial flash. This will ensure you don't lose it on OTA updates. If you are hesitate to do that, then you could move your FLASH_W section to the serial flash only when you perform a OTA, and then restore it when you have finished.

Hope that helps,
Vince

0 Jesus Martinez over 6 years ago in reply to Vincent Rodriguez

Prodigy 90 points

Thanks, now it works !

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Compiler/CC3220MODA: How to prevent the erase of an internal flash memory region during the OTA process ?