Why is tiny_itb coped to the boot partition?

kkrambo — Fri, 06 Aug 2021 15:45:48 GMT

I'm building a custom board based upon the LS1012A-FRWY and I'm studying how flex-builder (LSDK v20.12) creates the SD card to boot Ubuntu userland.

Why is is tiny_itb copied to the boot partition? I'm looking at the flex-builder generate_bootpartition_tarball() function. It copies the kernel, dtb, kernel modules, and distro boot script to the boot partition. But it also copies tiny_itb, which does not make sense to me. My understanding is that tiny_itb is the smallish Yocto TinyDistro. But the intention of the SD card is to contain and boot a largish Ubuntu distribution. Is it necessary for tiny_itb to be on the boot partition? When and how would this tiny_itb be used? The boot script is going to load Ubuntu and not tiny_itb.

I understand how tiny_itb can be used to initially format and program the SD card. (Before the Ubuntu distro is on the SD card, you can use U-Boot to load TinyDistro over Ethernet and into RAM, and then run TinyDistro to format and program Ubuntu userland onto the SD card.) What I don't understand is why is tiny_itb is included on the boot partition of the SD card along with the Ubuntu distribution.

Re: Why is tiny_itb coped to the boot partition?

yipingwang — Mon, 09 Aug 2021 03:19:19 GMT

I discussed this issue with flex-builder developer.

It's not necessary for tiny_itb to be on the boot partition.

Just for be convenient to download from disk.

LayerscapeのトピックRe: Why is tiny_itb coped to the boot partition?

Why is tiny_itb coped to the boot partition?

Re: Why is tiny_itb coped to the boot partition?