invalid lpc device configuration 'bootrom,BHYVE_UEFI_CSM.fd'

[mike-pt]

xhyve \
    -w \
    -m 4G \
    -c 2 \
    -s 0:0,hostbridge \
    -s 3,ahci-cd,$BOOTVOLUME \
    -s 4,ahci-hd,$IMG \
    -s 5,virtio-net \
    -s 29,fbuf,tcp=127.0.0.1:29000,w=1024,h=768,wait \
    -s 31,lpc -l com1,stdio \
    -l bootrom,$FIRMWARE

Using this which is prety much like the sample except I'm not using e1000 (which fails)

According to this and xhyve guide that last line should work, the file is places in the same dir