before letting system boots itself, press 3 (drop to boot prompt) as boot selection:

type these:

!!loading serial console

    consdev com0
    boot


netbsd will boot. if you needs more logs, use `boot -x` (debug) or `boot -v` (verbose) instead of boot

not so far, it will stop somewhere and turns VM off.

## logs

    > boot -x
    18072260+522816+849344 [892624+940937+17766]=0x14507d0
    Loading /stand/i386/9.2/modules/cd9660/cd9660.kmod
    [   1.0000000] rbus: rbus_min_start set to 0x40000000
    [   1.0000000] Copyright (c) 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005,
    [   1.0000000]     2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017,
    [   1.0000000]     2018, 2019, 2020 The NetBSD Foundation, Inc.  All rights reserved.
    [   1.0000000] Copyright (c) 1982, 1986, 1989, 1991, 1993
    [   1.0000000]     The Regents of the University of California.  All rights reserved.
    [   1.0000000] NetBSD 9.2 (GENERIC) #0: Wed May 12 13:15:55 UTC 2021
    [   1.0000000]  mkrepro@mkrepro.NetBSD.org:/usr/src/sys/arch/i386/compile/GENERIC
    [   1.0000000] total memory = 1000 MB
    [   1.0000000] avail memory = 963 MB
    [   1.0000000] Prep module path=cd9660 len=61432 pa=1551000
    [   1.0000000] WARNING: module error: module `cd9660' pushed by boot loader already exists
    [   1.0000000] running cgd selftest aes-xts-256 aes-xts-512 done
    [   1.0000030] efi: missing or invalid systbl
    [   1.0000030] BIOS32 rev. 0 found at 0xfefc2
    [   1.0000030] SMBIOS rev. 2.4 @ 0xf3f40 (10 entries)
    [   1.0000030] mainbus0 (root)
    [   1.0000030] Firmware Error (ACPI): A valid RSDP was not found (20190405/tbxfroot-261)
    acpi_probe: failed to initialize tables
    [   1.0000030] ACPI Error: Could not remove SCI handler (20190405/evmisc-312)
    [   1.0000030] cpu0 at mainbus0
    [   1.0000030] cpu0: 8 page colors
    [   1.0000030] cpu0: Intel(R) Xeon(R) CPU E5-2630 0 @ 2.30GHz, id 0x206d7
    [   1.0000030] cpu0: package 0, core 0, smt 0
    [   1.0000030] pci0 at mainbus0 bus 0: configuration mode 1
    [   1.0000030] pchb0 at pci0 dev 0 function 0: vendor 0b5d product 0666 (rev. 0x00)
    [   1.0000030] virtio0 at pci0 dev 1 function 0
    [   1.0000030] virtio0: Virtio Entropy Device (rev. 0x00)
    [   1.0000030] viornd0 at virtio0: Features: 0x0
    [   1.0000030] virtio0: pci_msix_count=0
    [   1.0000030] virtio0: interrupting at irq 3
    [   1.0000030] viornd0: WARNING: power management not supported
    [   1.0000030] virtio0: WARNING: power management not supported
    [   1.0000030] virtio1 at pci0 dev 2 function 0
    [   1.0000030] virtio1: Virtio Network Device (rev. 0x00)
    [   1.0000030] vioif0 at virtio1: Features: 0x20<MAC>
    [   1.0000030] vioif0: Ethernet address de:4b:aa:66:8f:b2
    [   1.0000030] virtio1: pci_msix_count=0
    [   1.0000030] virtio1: interrupting at irq 5
    [   1.0000030] vioif0: WARNING: power management not supported
    [   1.0000030] virtio1: WARNING: power management not supported
    [   1.0000030] virtio2 at pci0 dev 3 function 0
    [   1.0000030] virtio2: Virtio Block Device (rev. 0x00)
    [   1.0000030] ld0 at virtio2: Features: 0x2<SIZE_MAX>
    [   1.0000030] ld0: Clip SEG_MAX from 1024K to 64K
    [   1.0000030] virtio2: pci_msix_count=0
    [   1.0000030] virtio2: interrupting at irq 6
    [   1.0000030] ld0: 10240 MB, 5201 cyl, 64 head, 63 sec, 512 bytes/sect x 20971520 sectors
    [   1.0000030] virtio2: WARNING: power management not supported
    [   1.0000030] virtio3 at pci0 dev 4 function 0
    [   1.0000030] virtio3: Virtio SCSI Device (rev. 0x00)
    [   1.0000030] vioscsi0 at virtio3: Features: 0x0
    [   1.0000030] vioscsi0: cmd_per_lun 1 qsize 128 seg_max 17 max_target 1 max_lun 1
    [   1.0000030] virtio3: pci_msix_count=0
    [   1.0000030] virtio3: interrupting at irq 7
    [   1.0000030] scsibus0 at vioscsi0: 1 target, 1 lun per target
    [   1.0000030] vioscsi0: WARNING: power management not supported
    [   1.0000030] virtio3: WARNING: power management not supported
    [   1.0000030] vendor 0b5d product 0777 (miscellaneous communications) at pci0 dev 5 function 0 not configured
    [   1.0000030] isa0 at mainbus0
    [EOF]