Updating the uboot image on eMMC

General Discussion
,
1

I have the board running am335x-ubuntu-18.04.6-console-armhf-2022-07-12-4gb.img.xz image and board is booting fine.
In the current running image the uboot does not allow to stop the autoboot and enter into uboot console. I assume that CONFIG_BOOTDELAY is set as 0 by default.
So i build a uboot source obtained from git.beagleboard.org with CONFIG_BOOTDELAY set as 2. The build generated following files.
u-boot, u-boot.bin, u-boot.img, MLO.
How can i update the build u-boot image on eMMC. The aim is to stop the uboot autoboot and enter into uboot console.

2

On the am335x family, same way as microSD, same offset’s if you used dd, same fat format if you used file’s…

Regards,

3

HI @RobertCNelson .

I am completely new to beagle board . Can you share the full steps once.

4

Hi @amit22 i just dd them here:


if [ -b /dev/mmcblk0 ] ; then
	echo "dd if=${wdir}/MLO of=/dev/mmcblk0 count=2 seek=1 bs=128k"
	dd if=${wdir}/MLO of=/dev/mmcblk0 count=2 seek=1 bs=128k
	echo "dd if=${wdir}/u-boot-dtb.img of=/dev/mmcblk0 count=4 seek=1 bs=384k"
	dd if=${wdir}/u-boot-dtb.img of=/dev/mmcblk0 count=4 seek=1 bs=384k
fi

if [ -b /dev/mmcblk1 ] ; then
	echo "dd if=${wdir}/MLO of=/dev/mmcblk1 count=2 seek=1 bs=128k"
	dd if=${wdir}/MLO of=/dev/mmcblk1 count=2 seek=1 bs=128k
	echo "dd if=${wdir}/u-boot-dtb.img of=/dev/mmcblk1 count=4 seek=1 bs=384k"
	dd if=${wdir}/u-boot-dtb.img of=/dev/mmcblk1 count=4 seek=1 bs=384k
fi

Regards,