Reading from ISO9660 in U-Boot

[Simon Glass]

Hi Heinrick & Bin,

I'd like to be able to figure out in U-Boot what OS is on a USB stick.
For example, with the Ubuntu installer, I can boot it (through grub),
but I cannot see how to read anything useful from the USB stick that
would indicate that it is Ubuntu, what version it is, etc.

Does U-Boot need an ISO9660-filesystem driver for that? Is there any other way?

With Debian I can see the actual files (linux and initrd) , so it is a
bit easier.

Regards,
SImon