I have a Thinkpad T440p running Coreboot+SeaBIOS.
I have utterly failed to get the installer to boot on this machine. I have tried dding memstick.img, disc1.iso, and dvd1.iso to a USB stick as well as burning disc1.iso to a DVD-R. I verified the checksums on all downloaded files. I tested all of the media on another machine running the stock Lenovo firmware and all of them work. I also tested the downloaded files in a QEMU virtual machine with SeaBIOS and they work.
On the SeaBIOS machine, it does not even recognize the USB stick at all, and the DVD-R hangs on "Starting the BTX loader". But it has no problem recognizing and booting any Linux distro's installer from the same USB stick.
I have utterly failed to get the installer to boot on this machine. I have tried dding memstick.img, disc1.iso, and dvd1.iso to a USB stick as well as burning disc1.iso to a DVD-R. I verified the checksums on all downloaded files. I tested all of the media on another machine running the stock Lenovo firmware and all of them work. I also tested the downloaded files in a QEMU virtual machine with SeaBIOS and they work.
On the SeaBIOS machine, it does not even recognize the USB stick at all, and the DVD-R hangs on "Starting the BTX loader". But it has no problem recognizing and booting any Linux distro's installer from the same USB stick.