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Re: [Qemu-devel] [RFC PATCH 2/2] Split fdd devices off the floppy contro

From: Andreas Färber
Subject: Re: [Qemu-devel] [RFC PATCH 2/2] Split fdd devices off the floppy controller
Date: Mon, 14 May 2012 13:58:13 +0200
User-agent: Mozilla/5.0 (X11; Linux x86_64; rv:12.0) Gecko/20120421 Thunderbird/12.0

Am 14.05.2012 10:47, schrieb Kevin Wolf:
> Am 11.05.2012 17:22, schrieb Markus Armbruster:
>> For historical reasons, and unlike other block devices, our floppy
>> devices isa-fdc, sysbus-fdc and SUNW,fdtwo integrate the controller
>> and the drive(s) in a single qdev.  This makes them weird: we need
>> -global to set up floppy drives, unlike every other optional device.
> I like the idea of splitting the drives from the controller. In fact, I
> think we could even try to split them into a separate hw/fdd.c

Seconded, however that might make the patch harder to read due to the
code movements.

>> Unfortunately, eliding the qbus means I can't make the floppy disk a
>> qdev (sub-class of TYPE_DEVICE), because qdevs can only connect to a
>> qbus.  Anthony tells me that restriction is gone in his latest QOM
>> series.
>> Since it's not a qdev, -device fdd does not work.  Pity, because it
>> defeats the stated purpose of making floppy disk drives work like
>> other existing optional devices.
> As long as this is true, committing a patch like this doesn't help a
> lot, so I hope Anthony's patches will go in before this is ready.

Having gone through nearly all QOM patches on the list for qom-next,
this is not something I remember seeing yet.


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