[SeaBIOS] [BUG?] Doesn't retrieve control after coreboot payload return

[Antonello Dettori]

Hi everyone.

I'm currently working on coreboot but I stumbled on a strange SeaBIOS 
behaviour.
After executing a payload and returning control to the caller SeaBIOS 
crashes.

The problem is currently solved by rebooting before the payload returns 
but doing so also makes chaining multiple payloads impossible so I'm 
trying to look into a solution.

I tried to increment the debug level to 8 to get more information and 
the attached log is what I got.
I also attached a build of coreboot with this problem if someone wants 
to try it in QEMU.

I'm not terribly knowledgeable about SeaBIOS so I'm a bit lost.

Could anyone point me where the problem could be originating from?

Thanks in advance,

Antonello Dettori