Flash Teensy 3.0 from sd card?

[renasis]

Paul,

Is it possible to change the flashconfig bytes(16bytes @ x400)? I tried changing them in mk128dx.c from their default values, but the change did not take. Is teensyloader modifying them prior to upload?

Thanks,

-ren

 

[xxxajk]

Paul,

Is it possible to change the flashconfig bytes(16bytes @ x400)? I tried changing them in mk128dx.c from their default values, but the change did not take. Is teensyloader modifying them prior to upload?

Yes, the loader changes them so that you don't brick it.

 

[renasis]

Thanks xxxajk. That was a good idea by Paul. Now i am trying to find out how the teensyduino program works. Does it erase the entire chip before it uploads code? Does it write the hex file starting at the flash start address specified in the linker. Default is 0x0, but if I changed this to 0xc000, would it start at 0xC000?