SBL UART

Table of Contents

• Introduction
• SBL UART MULTICORE ELF
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This bootloader does SOC initializations and attempts to boot a multicore appimage received over UART via XMODEM. The image file is sent using a python script (See UART Bootloader Python Script). Once image is received, the SBL parses it. Each core is then initialized, application image is loaded, entry points are set and the core is released from reset. For more on bootflow/bootloaders, please refer Understanding the bootflow and bootloaders

Note

RPRC image booting using SBL would be deprecated from SDK 11.00 release onwards. MCELF would be the default boot image format supported by SBL going forward.

SBL UART MULTICORE ELF

To parse and load an mcelf file via UART bootloader, use the project examples/drivers/boot/sbl_uart_multicore_elf

When an mcelf image is received, the SBL parses it, loads each segment to its respective core. Then the core is released from reset. For more information refer Understanding the bootflow and bootloaders

The steps to run the example is same irrespective of the image format.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am263px-cc, am263px-lp
Example folder	examples/drivers/boot/sbl_uart

Steps to Run the Example

Since this is a bootloader and is used as a SOC initialization binary, the example will be run every time you boot an application using this example. It is generally run from a boot media (OSPI Flash, SD Card or over UART) unlike other examples which are usually loaded with CCS. Nevertheless, you can build this example like you do for the others using makefile or build it via CCS by importing as a project.

• When using CCS projects to build, import the CCS project for the required combination and build it using the CCS project menu (see Using SDK with CCS Projects).
• When using makefiles to build, note the required combination and build using make command (see Using SDK with Makefiles

See Also

BOOTLOADER

Sample Output

Since this SBL receives the appimage over UART using XMODEM protocol, it doesn't print anything to the console so as not to corrupt the XMODEM transport.