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How to write Boot Loader to Flash through USB

Sharon Ben Porath
Prodigy 10 points


Hi,

I have a device using TM4C (not sure which exact model). It is a commercial device (Avegant Glyph), which only has USB I/F.

It's boot Loader puts it in DFU mode, so I can connect to it using LM Flash Programmer and write firmware images (the application memory space starts at 0x4000).

I encountered a problem that requires me to write an updated Boot Loader image. I have the bin file, and it should be downloaded to address 0x0 of the Flash, but I can't figure out how to do that.

Trying to write to address 0x0 using the LM Flash Programmer results with an error message. i also tried to erase the entire Flash, in the hope that the device has a DFU boot loader in ROM as well (not really sure about it), but in any case erasing below address 0x4000 is also blocked (protected I guess).

I found in the TI Boot Loader manual that there should be a method for the boot loader to update itself in DFU devices, by copying itself to SRAM, writing the new image and then trying to run it with a safe mechanism that can switch back to the SRAM copy if it fails. I have no idea how to do that.

Any guidance here would be much appreciated.

  • 0
    TI__Guru**** 244400 points
    Hello Sharon

    If it is a 3rd party product that you are trying to update, then you need to check with them. Without knowing which TM4C part it is or if there are any disclaimers or legal bindings, we cannot provide an answer on how to....