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If set, this is the path of a binary blob to load into the ROM BIOS area and execute immediately after CPU reset.

It will be executed before the BIOS POST routine, only ONCE.

The binary blob is expected either to IRET or to
jump directly to F000:FFF0 to return control to the BIOS.

This can be used for x86 assembly language experiments and automated testing against the CPU emulation.
