pxe boot 6.7 microcode timeout

[Rupert Gallagher]

openbsd 6.7 pxeboot calls /etc/firmware/amd/microcode_amd_fam16h.bin via tftp 
right after /openbsd/bsd.rd. I retrieved the official binary file from linux 
git and put it where it belongs with correct permissions. The tftpd log 
registers 'retry: operation timeout'. Is this the file you need? Is the file 
rejected for some reason?