[FAQ] AM625: Build DFU enabled U-boot with Yocto for AM62 devices

Vinuchandran A V

Part Number: AM625
Other Parts Discussed in Thread: AM62P, AM62L

Overview

This article describes how to build and boot DFU enabled U-boot images on TI-K3 devices such as AM62X, AM62A AM62P, AM62L and AM64L using Yocto

USB-DFU (Device Firmware Upgrade) is a standard mechanism defined by the USB-IF to upgrade, update, or repair a device's firmware directly over a USB cable.

USB-DFU can be used to flash a device using nothing but a USB connection and a host PC. This is particularly useful for custom boards during factory provisioning, field recovery, or in cases where no other boot media (such as an SD card) is available.

Depending on the SoC and SDK version, DFU may already be enabled in the default U-Boot defconfig or an additional DFU configuration fragment must be added.

For platforms requiring DFU support, the am62x_r5_usbdfu.config fragment must be added along with the default R5 SPL defconfig.

Prerequisites

Requirements

AM62P/AM62A/AM62X/AM62L/AM64X EVM
Host Linux PC with necessary Yocto SDK setup.

2 months ago

+1 Vinuchandran A V 2 months ago

TI__Expert 5300 points

AM62A

SDK 10.01 / SDK 11.01

Setup Yocto Environment as mentioned in the below guides

10.01- https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/10_01_00/exports/docs/linux/Overview_Building_the_SDK.html

11.01- https://software-dl.ti.com/processor-sdk-linux/esd/AM62AX/11_01_07_05/exports/docs/linux/Overview_Building_the_SDK.html

Update conf/local.conf

Add the following to local.conf to enable the R5 DFU config fragments.

# U-Boot config and fragments for R5
UBOOT_CONFIG_FRAGMENTS:am62axx-evm-k3r5 = "am62x_r5_usbdfu.config"

Note: AM62X r5 config fragment is used for AM62A

Rebuild U-boot from Yocto

# Clean U-Boot

MACHINE=am62axx-evm bitbake mc:k3r5:u-boot-ti-staging -c cleansstate
MACHINE=am62axx-evm bitbake u-boot-ti-staging -c cleansstate

# Build U-Boot

MACHINE=am62axx-evm bitbake mc:k3r5:u-boot-ti-staging
MACHINE=am62axx-evm bitbake u-boot-ti-staging

+1 Vinuchandran A V 2 months ago in reply to Vinuchandran A V

TI__Expert 5300 points

AM62P

For AM62P, the steps for SDK 11 and SDK 12 varies slightly.

SDK 11.02

Setup Yocto Environment as mentioned in the below guide

11.02- https://software-dl.ti.com/processor-sdk-linux/esd/AM62PX/11_02_08_02/exports/docs/linux/Overview_Building_the_SDK.html

Update conf/local.conf

Add the following to local.conf to enable the R5 DFU config fragments.

# U-Boot config and fragments for R5
UBOOT_CONFIG_FRAGMENTS:am62pxx-evm-k3r5 = "am62x_r5_usbdfu.config

Note: AM62X r5 config fragment is used for AM62P

SDK 12.00

Setup Yocto Environment as mentioned in the below guide

12.00- https://software-dl.ti.com/processor-sdk-linux/esd/AM62PX/12_00_00_07_04/exports/docs/linux/Overview_Building_the_SDK.html

Update conf/local.conf

Add the following to local.conf to enable the R5 DFU config fragments.

# U-Boot config for R5
UBOOT_CONFIG:am62pxx-evm-k3r5 = "usbdfu"

Rebuild U-boot from Yocto

# Clean U-Boot

MACHINE=am62pxx-evm bitbake mc:k3r5:u-boot-ti-staging -c cleansstate
MACHINE=am62pxx-evm bitbake u-boot-ti-staging -c cleansstate

# Build U-Boot

MACHINE=am62pxx-evm bitbake mc:k3r5:u-boot-ti-staging
MACHINE=am62pxx-evm bitbake u-boot-ti-staging

+1 Vinuchandran A V 2 months ago in reply to Vinuchandran A V

TI__Expert 5300 points

AM62X

For AM62X too, the steps for SDK 11 and SDK 12 varies.

SDK 11.02

Setup Yocto Environment as mentioned in the below guide

11.02- https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/11_02_08_02/exports/docs/linux/Overview_Building_the_SDK.html

Update conf/local.conf

Add the following to local.conf to enable the R5 DFU config fragments.

# U-Boot config and fragments for R5
UBOOT_CONFIG_FRAGMENTS:am62xx-evm-k3r5 = "am62x_r5_usbdfu.config"

Note: AM62X r5 config fragment is used for AM62P

SDK 12.00

Setup Yocto Environment as mentioned in the below guide

12.00- software-dl.ti.com/.../Overview_Building_the_SDK.html

Update conf/local.conf

Add the following to local.conf to enable the R5 DFU config fragments.

# U-Boot config and fragments for R5
UBOOT_MACHINE:am62xx-evm-k3r5 = "am62x_evm_r5_defconfig"
UBOOT_CONFIG_FRAGMENTS:am62xx-evm-k3r5 = "am62x_r5_usbdfu.config"

Rebuild U-boot from Yocto

# Clean U-Boot

MACHINE=am62xx-evm bitbake mc:k3r5:u-boot-ti-staging -c cleansstate
MACHINE=am62xx-evm bitbake u-boot-ti-staging -c cleansstate

# Build U-Boot

MACHINE=am62xx-evm bitbake mc:k3r5:u-boot-ti-staging
MACHINE=am62xx-evm bitbake u-boot-ti-staging

+1 Vinuchandran A V 2 months ago in reply to Vinuchandran A V

TI__Expert 5300 points

AM62L/AM64X

For AM62L and AM64X, the default U-boot is built with DFU enabled.

+1 Vinuchandran A V 2 months ago in reply to Vinuchandran A V

TI__Expert 5300 points

Build artefacts

The built artefacts can be found under the following locations

R5 SPL: build/deploy-ti/images/<machine>/tiboot3.bin
A53 SPL: build/deploy-ti/images/<machine>/tispl.bin
U-boot proper: build/deploy-ti/images/<machine>/u-boot.img

Processors

Processors forum

[FAQ] AM625: Build DFU enabled U-boot with Yocto for AM62 devices

Overview

Prerequisites

Requirements