Is there a simple way to update the DTB and kernel image on an eMMC?

[Keta_S_Nitsure]

During development, we need to frequently update the DTB and kernel image.
Using an SD card is very convenient; a card reader can read and write the DTB and kernel image on a FAT partition.
However, using an eMMC is very inconvenient. Is there a simpler method?

[JorgeCas]

Hello,

You can update the DTB file configuring your board in fastboot from U-boot and transfer the file with UUU.

Regarding flash the image I suggest you re-flash with UUU or try to flash the eMMC from SD card but I think this process is more complicated. 

Best regards.

[Keta_S_Nitsure]

How to do this specifically?

Is there any guidance document?

Thanks.

[JorgeCas]

Hello,

What are you referring for?

Upload DTB with fastboot or flash eMMC from SD card or both?

Best regards.

[Keta_S_Nitsure]

Use fastboot, as you mentioned before.

Thanks.

[JorgeCas]

Hello,

To enter on fastboot mode you need:

1. Turn on the board and stop boot flow pressing any key to enter in U-boot.

2. In U-boot enter next command:

fastboot 0

Use the next command to send the file with UUU:

uuu -v -b fat_write <file> mmc 0:1 <file>

Example:

uuu -v -b fat_write hello_world.elf mmc 0:1 hello_world.elf

Best regards.

[meketok · Accepted solution]

Here is the better way, I believe.

How to upgrade Linux Kernel and dtb on eMMC without UUU 

[Keta_S_Nitsure]

@meketok 

Wow! That's awesome.

This doesn't need a uuu; it's simple and practical, and the entire board becomes a card reader.

Thanks!