[coreboot] Buildrom seems more fragile

[Myles Watson]

I don't know exactly what happened, but buildrom seems more fragile lately.

I used to be able to:

make menuconfig (select all options including a payload)
make
test it on QEMU
make menuconfig (select a different payload)
make
etc.

Now I have to make clean after a payload switch.  Is this by design?

Myles