TM4C123BH6ZRB: TM4C123B bootloader use I2C interface

JK Wolf

Part Number: TM4C123BH6ZRB

Hi,

I am trace c:\ti\TivaWare_C_Series-2.1.4.178\boot_loader\bl_main.c

What's happen need "Erase the boot loader"?

// Erase the boot loader.
//
for(ui32Temp = 0; ui32Temp < APP_START_ADDRESS;
ui32Temp += FLASH_PAGE_SIZE)
{
//
// Erase this block.
//
BL_FLASH_ERASE_FN_HOOK(ui32Temp);
}

BR,

over 6 years ago

0 Ralph Jacobi over 6 years ago

TI__Guru*** 135355 points

Hello JK Wolf,

That is there only if you have an application that is meant to load in on top of your boot loader as well. Not usually the case, but the hook exists if desired. Perhaps for a One-Time Programmable boot loader?

0 JK Wolf over 6 years ago in reply to Ralph Jacobi

Prodigy 180 points

hi Ralph,
Thanks for your reply,
The bl_main.c is run on flash, boot loader can erase itself ?

My flash layout is 8k boot loader on top, followed by the application.

BR,
JK

0 Ralph Jacobi over 6 years ago in reply to JK Wolf

TI__Guru*** 135355 points

Hello JK,

Yes it can because the boot loader will execute out of SRAM, not Flash, so it is possible to then overwrite the flash portion of the boot loader if desired.

The boot loader when invoked will copy into SRAM and then continue execution from there, so it doesn't run out on flash except for the very beginning.

Arm-based microcontrollers

Arm-based microcontrollers forum

TM4C123BH6ZRB: TM4C123B bootloader use I2C interface