SBL NULL

Table of Contents

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

Introduction

This is a bootloader which does SOC initializations and put all the cores in WFI. This example is what is referred to as the SOC initialization binary in Flash SOC Initialization Binary. The SBL NULL does not load any images on the cores. For more information on how this example is being used, refer Flash SOC Initialization Binary

Note

DDR inline ECC is enabled in the sysconfig from 0x8000000 to 0x80060000 address region. You can disable ECC or modify the ECC address regions in the sysconfig if required. Refer Enabling DDR inline ECC for more details

Attention

Migration steps to 09.02 SDK

The ECC region end address in the SBL NULL sysconfig file is changed as follows.

ddr1.eccEnd0       = 0x1FFFF;
ddr1.eccEnd1       = 0x3FFFF;
ddr1.eccEnd2       = 0x5FFFF;

If you are using older sysconfig file but driver from 09.02 SDK, please change the ECC end address to match all the conditions. Refer Step 1: Enable inline ECC in the SBL sysconfig

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am62x-sk, am62x-sk-lp, am62x-sip-sk
Example folder	examples/drivers/boot/sbl_null

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) 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.

Note

This example is not supported for HS-SE devices as JTAG can not be connected to HS-SE devices by default.

• 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)
• Flash this bootloader by following steps mentioned in Flash SOC Initialization Binary

See Also

BOOTLOADER

Sample Output

Starting NULL Bootloader ...
 
SYSFW Version 8.4.7--v08.04.07 (Jolly Jellyfi
SYSFW revision 0x8
DMSC ABI revision 3.1
 
INFO: Bootloader_runCpu:155: CPU m4f0-0 is initialized to 400000000 Hz !!!
INFO: Bootloader_loadSelfCpu:207: CPU r5f0-0 is initialized to 400000000 Hz !!!
INFO: Bootloader_JumpSelfCpu:226: All done, jumping self ...