[Bug 1906463] [NEW] "-device help" does not report all devices

[Doug Evans]

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.

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.

** Affects: qemu
     Importance: Undecided
         Status: New

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https://bugs.launchpad.net/bugs/1906463

Title:
  "-device help" does not report all devices

Status in QEMU:
  New

Bug description:
  -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.

  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.

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