QEMUFWCFG(4) Device Drivers Manual QEMUFWCFG(4)

qemufwcfg
QEMU Firmware Configuration device driver

qemufwcfg* at acpi?
qemufwcfg* at fdt?

The qemufwcfg interface allows QEMU to provide data items and files to guest operating systems.

See the -fw_cfg option in the qemu man page.

/dev/qemufwctl<n>
device path

mount_qemufwcfg(8)

QEMU Firmware Configuration (fw_cfg) Device, https://raw.githubusercontent.com/qemu/qemu/master/docs/specs/fw_cfg.txt.

The qemufwcfg driver first appeared in NetBSD 9.0.
July 11, 2018 NetBSD 9.4