[U-Boot] Common u-boot image for e300 and e500v2

[Johns Daniel]

Is it possible -- and prudent -- to use a single u-boot binary image
for two similar boards, one based on an e300 core and the other on an
e500v2 core?

My guess is that it is not possible, but I was surprised to see that
the e500v2-targeted toolchain did build the kernel for the e300 board
just fine.

Would love to hear the technical nuances involved with this...

-- Johns