AM625：Yocto DFU

hi!

DFU is the process/tooling to program images to media such as eMMC. For this, U-Boot is used as device-side tooling and needs to be build using a special configuration (by including `am62x_r5_usbdfu.config` and `am62x_a53_usbdfu.config`), as per SDK documentation.

https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_01_10_04/exports/docs/linux/Foundational_Components/U-Boot/UG-DFU.html
https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_01_10_04/exports/docs/linux/Foundational_Components/U-Boot/UG-General-Info.html#build-u-boot-label

Is your question regarding how to generate an DFU-capable U-Boot stack using Yocto, rather than manually?

As for booting from the eMMC itself once your application image is programmed, no special DFU-capable bootloader is required; the standard U-Boot configuration from our SDK/Yocto build should be sufficient for eMMC boot.

Regards, Andreas

Hi Andreas,

thanks for your reply

Now I know that I need to use `am62x_r5_usbdfu.config` and `am62x_a53_usbdfu.config` for DFU construction, but I don't know in which path `am62x_r5_usbdfu.config` and `am62x_a53_usbdfu.config` are located, and I don't know whether the subsequent burned files (tiboot3.bin, tispl.bin, u-boot.img, ti_rootfs.ext4) are in the SDK path (/home/user/tisdk/build/deploy-ti/images/am62xx-evm/).

Thank you ~ ~

Hi Yaohui,

To build a DFU-capable U-Boot to use as a programming tool you would typically use the SDK to build that, there's no need to use Yocto for this (but you can, if needed-- just more steps/work). Did you review the two documentation links I posted earlier? They should have all the instructions in there that are needed.

The only noteworthy thing in there is that for building U-Boot SPL for R5 (a.k.a. "tiboot3.bin") for DFU you need to specify both am62x_evm_r5_defconfig and am62x_r5_usbdfu.config when configuring U-Boot, in the same command, like this.

cd $UBOOT_DIR

# R5
# To build tiboot3.bin. Saved in $UBOOT_DIR/out/r5
$ make ARCH=arm CROSS_COMPILE="$CROSS_COMPILE_32" am62x_evm_r5_defconfig am62x_r5_usbdfu.config O=$UBOOT_DIR/out/r5
$ make ARCH=arm CROSS_COMPILE="$CROSS_COMPILE_32" O=$UBOOT_DIR/out/r5 BINMAN_INDIRS=$TI_LINUX_FW_DIR

<...continue as per https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/10_01_10_04/exports/docs/linux/Foundational_Components/U-Boot/UG-General-Info.html#build-u-boot ...>

U-Boot is located at `<SDK_INSTALL_DIR>/board-support/u-boot-extras-jailhouse-2024.04+git/` for that particular AM62x SDK v10.01.10.04 you are wanting to use.

Regards, Andreas

你好，安德烈亞斯，

    我不太明白如何填寫以下內容
$ export UBOOT_DIR=<path-to-ti-u-boot>
$ export TI_LINUX_FW_DIR=<path-to-ti-linux-firmware> $ export TFA_DIR=<path-to-arm-trustede-firmware>
$op export TFA_DIR=<path-to-arm-trute-firmware> $opp-f-ware> $op-Tg-to-arm-trude-firmware> $opp-f-ware
> $op-Tp-to-arm

Assuming I don't use SDK, I want to use Yocto environment to build DFU compilation tool. Is there any relevant process description?

Please help again ~ ~ Thank you ~ ~