SBL SD

Table of Contents

• Introduction
• Supported Combinations
• Steps to Run the Example
• See Also
• Sample Output

Introduction

This bootloader does SOC initializations and attempts to boot a multicore appimage file named "app" present in the first FAT partition found in the connected SD card. The file can be copied to the SD card by connecting it to the host PC using a card reader. Make sure that it is named "app" without any file extension. If the card is new, make sure that it is formatted with FAT32/16.

If a multicore appimage file is found at the location, the SBL reads the file into a buffer, parses it, splits it into RPRCs for each core applicable. Each core is then initialized, RPRC 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

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am243x-evm
Example folder	examples/drivers/boot/sbl_sd

Steps to Run the Example

Since this is a bootloader, the example will be run every time you boot an application using this example. It is run from an SD card 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)
• Refer to the page Basic steps to flash files to flash this bootloader along with the application to boot.

See Also

BOOTLOADER

Sample Output

[BOOTLOADER PROFILE] SYSFW Load                       :      17632us
[BOOTLOADER PROFILE] System_init                      :      12246us
[BOOTLOADER PROFILE] Drivers_open                     :      82499us
[BOOTLOADER PROFILE] Board_driversOpen                :          0us
[BOOTLOADER PROFILE] File read from SD card           :       6843us
[BOOTLOADER PROFILE] CPU load                         :       9501us
[BOOTLOADER_PROFILE] SBL Total Time Taken             :     129399us
 
Image loading done, switching to application ...