TMS570LC4357: Move the start address of the program

Alexis Gioda

Part Number: TMS570LC4357

Hello everyone,

My project consists of two distinct parts: a "BootLoader" and an "Application". I want the application start from a special address such as 0x00004000, but the application can't upload properly.
I’m a bit confused about it.

I face several challenges:

1. I cannot change the bootloader and application startup address
I have changed the addresses in my code but cannot upload (I have a bus error generated by CPU). I read that I had to change an address in HL_sys_intvecs.asm but I did not understand.

2. How do I properly configure the interrupt vectors for the Boot Loader and the Application?

I would be grateful if someone could give me advice. If you have already done a similar task, I would love to hear your experience.

Thanks in advance for your help!

over 2 years ago

0 jagadish gundavarapu over 2 years ago

TI__Guru 71501 points

Hi Alexis,

Can you please refer below link for ethernet bootloader example:

6.1. Project 0 — Hercules Safety MCUs Documentation

Similarly, we also have CAN bootloader example here, so please refer them once:

Bootloaders - hercules_examples/hercules_examples - Software Examples for Hercules Processors (ti.com)

And also refer below thread for UART bootloader example:

(+) RM57L843: Uart Bootloader - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Thanks & regards,
Jagadish.

0 Alexis Gioda over 2 years ago in reply to jagadish gundavarapu

Prodigy 40 points

Hi Jagadish,

I don't understand how to proceed with the Exception Vector Table. I need to have 2 vector tables ( One for the app and one for the bootloader) ?

Thanks,

Alexis

0 jagadish gundavarapu over 2 years ago in reply to Alexis Gioda

TI__Guru 71501 points

Hi Alexis,

Alexis Gioda said:
I don't understand how to proceed with the Exception Vector Table. I need to have 2 vector tables ( One for the app and one for the bootloader) ?

Yes, you should add two vector tables.

For example:

If your bootloader is stored from 0x00000000 and your application is starting from 0x000C0000 then in that case the bootloader VECTORS table should be located in 0x00000000 to 0x00000020 and application VECTORS table should be located in 0x000C0000 to 0x000C0020.

you can just have a look on below thread:

(+) LAUNCHXL2-RM57L: Jump from Bootloader to Application after reset - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Thanks & regards,
Jagadish.

0 Alexis Gioda over 2 years ago in reply to jagadish gundavarapu

Prodigy 40 points

Hi, Thank you for your response.

I found this file "Sharing Exception Vectors on Hercules-Based Microcontrollers" that says I can put the vector table in SRAM.

spna236.pdf

I have my vectors table stored from 0x00000000 to 0x00000020 and my application vectors table from 0x00004000 to 0x00004020.

I'm lost, I don't know the best way to proceed. Is it 2 different methods ? How can I have two vectors table ? I need 2 linker files ?

Thanks & regards,

Alexis

+1 jagadish gundavarapu over 2 years ago in reply to Alexis Gioda

TI__Guru 71501 points

Hi Alexis,

The app note you shared is for a special requirement of storing exception vector table in the RAM, instead of keeping different vector tables for both bootloader and application.

Alexis Gioda said:
I'm lost, I don't know the best way to proceed. Is it 2 different methods ? How can I have two vectors table ? I need 2 linker files ?

But the simplest way is to use different vector tables for both bootloader and application.

Yes, you have to use two linker files.

For your understanding purpose i am attaching one Bootloader and application files here for working project, please verify their linker files.

0576.Hercules_Ethernet_Bootloader_RM57.zip

8171.LED_Blinky_RM57_At_0x20020.zip

For more details of these projects, you can refer below FAQ:
(22) [FAQ] RM57L843: Describing step by step procedure to use Ethernet Bootloader in static IP for Hercules device (RM57x) - Arm-based microcontrollers forum - Arm-based microcontrollers - TI E2E support forums

Thanks & regards,
Jagdish.