As you would expect from something with a standard BIOS I had no problems running Tiny Core 10.1 from a pen drive although at one point my usual Labtec/Novatek keyboard started misbehaving. I unplugged it and plugged in a Lenovo keyboard I had to hand and continued without any more issues. Maybe this is another Wyse thin client that is a bit picky about the USB keyboard?
With Tiny Core and the 3030 LT, as the flash is interfaced by an MMC controller, it appears to the system as /dev/mmcblk0 and the active partition as /dev/mmcblk0p1.
I successfully installed Tiny Core 10.1 onto the internal flash drive.
I had no issues with Tiny Core 14.0 however Linus had issues trying to netboot his 3030LT. He wrote:
I wanted to netboot my Wyse 3030 LT, and had some issues with the UEFI PXE implementation in firmware version 1.0G (which was installed when I got the device): it seems not to support 64-bit images, even though booting from local media works just fine.
So I set about trying to upgrade the BIOS using flashrom. I was able to "upgrade" to the 1.0Q/1.0R firmware from the WES7 download. (It reports itself as 1.0R even though the file also contains the string "_WY_Bios Version 1.0Q") This required padding it with 4MiB of zeroes at the beginning, since the BIOS is only the second half of the 8MiB flash chip.
The replacement firmware (intended for the 3290) exposes the device's SATA interface (though as you've already documented, the connector for this isn't actually populated on the board), while making the eMMC disappear -- a bit of an unfortunate consequence. More importantly, however, this does fix 64-bit netboot!
I'll be continuing to hack on this in hopes of getting eMMC and 64-bit netboot working simultaneously.