Has anyone used iPXE to boot off Android?

[mikechan]

Not yet.
Android is using bionic libc which is not compatible with glibc which is the open-iscsi compiled with.

Alpine Linux is using musl libc, they immigrate opetn-iscsi into the userland but not yet into kernel root file system. Even the kernel is supporting iscsi, you still need the kernel mount the iscsi drive prior to the OS start.

In order for Android to boot off iscsi, you first have to recode open-iscsi based on bionic libc, then move to its kernel rootfs.

Both musl and bionic are claiming to support booting off NFS root file system which usually is the foundation to boot off iscsi. The actual success demo is hard to be found.