SBL SD LINUX

Table of Contents

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

Note

SBL SD Linux boots from the boot partition 1 of SD and uses a filesystem boot.

Attention

Care should be taken to ensure that the MCU_R5, DM_R5, C7x appimages and the Linux appimage flashed with correct names.

Introduction

This is a bootloader example, which shows an example of booting Linux on A53 core and RTOS/NORTOS applications on R5 cores.

The SBL uses two appimages

• A Linux appimage containing the Linux binaries (ATF, OPTEE, A53 SPL).
• A muticore appimage containing the RTOS/NORTOS applications for MCU_R5, DM_R5 and C7x cores.

The bootloader does SOC initializations and parses the multicore appimage present in boot partition of sd card, 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 booting Linux, SBL parses the Linux appimage present as linux_a53_image in boot partition of sd card, splits it into individual linux binaries (ATF, OPTEE, SPL). SBL loads the Linux binaries, entry point is set to the start address of ATF and A53 core is released from reset.

Supported Combinations

Parameter	Value
CPU + OS	r5fss0-0 nortos
Toolchain	ti-arm-clang
Boards	am62ax-sk
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.

Flash SD card

Copy sbl_sd_linux.tiimage to boot partition of the SD card as tiboot3.bin. For booting A53 with Linux and running applications on other cores (MCU R5F, DM R5F, C7x) the appimages should be copied to SD card with correct file names.

File names for respective applications

• Linux APP image linux_a53_image
• R5 APP image dm_r5_image
• MCU R5 APP image mcu_r5_image
• C7X image c7x_image

Note

All the images should be present in boot partition of SD card.

See Also

BOOTLOADER

Sample Output

DMSC Firmware Version 9.0.5--v09.00.05 (Kool Koala)
DMSC Firmware revision 0x9
DMSC ABI revision 3.1
 
[BOOTLOADER_PROFILE] Boot Media       : SD Card
[BOOTLOADER_PROFILE] Boot Image Size  : 198 KB
[BOOTLOADER_PROFILE] Cores present    :
mcu-r5f0-0
r5f0-0
a530-0
[BOOTLOADER PROFILE] System_init                      :      38563us
[BOOTLOADER PROFILE] Drivers_open                     :     125747us
[BOOTLOADER PROFILE] Board_driversOpen                :          0us
[BOOTLOADER PROFILE] Sciclient Get Version            :       9814us
[BOOTLOADER PROFILE] App_loadImages(CSL_CORE_ID_R5FSS0_0) :     150395us
[BOOTLOADER PROFILE] App_loadLinuxImages              :     145879us
[BOOTLOADER_PROFILE] SBL Total Time Taken             :     470400us
 
Image loading done, switching to application ...
Starting linux and RTOS/Baremetal applications
NOTICE:  BL31: v2.8(release):v2.8-226-g2fcd408bb3-dirty
NOTICE:  BL31: Built : 00:42:57, Jan 13 2023
 
U-Boot SPL 2023.04-g24098ea90d (Jul 06 2023 - 12:59:40 +0000)
SYSFW ABI: 3.1 (firmware rev 0x0009 '9.0.5--v09.00.05 (Kool Koala)')
am62a_init: board_init_f done
am62a_init: spl_boot_device: devstat = 0x243 bootmedia = 0x8 bootindex = 0
Trying to boot from MMC2
am62a_init: spl_boot_device: devstat = 0x243 bootmedia = 0x8 bootindex = 0
Authentication passed
am62a_init: spl_boot_device: devstat = 0x243 bootmedia = 0x8 bootindex = 0
Authentication passed
 
 
U-Boot 2023.04-g756ba776d4 (Jul 13 2023 - 05:36:12 +0000)
 
SoC:   AM62AX SR1.0 HS-FS
Model: Texas Instruments AM62A7 SK
DRAM:  2 GiB (effective 4 GiB)
Core:  57 devices, 27 uclasses, devicetree: separate
MMC:   mmc@fa10000: 0, mmc@fa00000: 1
Loading Environment from nowhere... OK
In:    serial@2800000
Out:   serial@2800000
Err:   serial@2800000
Net:   eth0: ethernet@8000000port@1
Hit any key to stop autoboot:  0
=>
 
 
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