Doug Evans <1906...@bugs.launchpad.net> writes:
> Public bug reported:
>
> -device help doesn't report all devices.
> E.g., devices that are instantiated by a board don't get printed in part
> because they don't exist when "-device help" is processed. As an experiment I
> deferred processing of "-device help" as long as possible and some devices
> were still not printed, so there's more going on here.
>
> QEMU commit hash: 944fdc5e27a5b5adbb765891e8e70e88ba9a00ec
>
> Repro:
> $ configure --target-list=arm-softmmu
> $ make
> $ ./qemu-system-arm -device help | grep npcm7xx
> <empty>
>
> I'd expect to see things like npcm7xx-rng in the output.
Works as intended.
"-device help" shows the devices that are available with -device.
npcm7xx-rng isn't:
$ qemu-system-arm -M virt -device npcm7xx-rng
qemu-system-arm: -device npcm7xx-rng: Parameter 'driver' expects pluggable
device type
Monitor command "info qdm" shows all devices, including npcm7xx-rng:
$ qemu-system-arm -M virt -monitor stdio
QEMU 5.1.92 monitor - type 'help' for more information
(qemu) info qdm
[...]
name "npcm7xx-rng", bus System, desc "NPCM7xx Random Number Generator",
no-user
[...]
Note "no-user": it's not available with -device.
> I can imagine enumerating board-provided devices is a challenge.
> Still, it'd be really nice if "-device help" printed them, and having
> "-device $driver,help" work as well.
It works:
$ qemu-system-arm -M virt -device npcm7xx-rng,help
npcm7xx-rng options:
regs[0]=<child<qemu:memory-region>>
Hope this helps!
