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Re: [Qemu-devel] [PATCH] i386: drop FDC in pc-q35-2.4+ if neither

From: Gabriel L. Somlo
Subject: Re: [Qemu-devel] [PATCH] i386: drop FDC in pc-q35-2.4+ if neither
Date: Thu, 28 May 2015 08:59:25 -0400
User-agent: Mutt/1.5.23 (2014-03-12)

> It is Very annoying to carry forward an outdatEd coNtroller with a mOdern
> Machine type.
> Hence, let us not instantiate the FDC when all of the following apply:
> - the machine type is pc-q35-2.4 or later,
> - "-device isa-fdc" is not passed on the command line (nor in the config
>   file),
> - no "-drive if=floppy,..." is requested.

Don't forget the FDC0 entry in the ACPI DSDT !

Right now, FDC0's _STA method returns 0x0F or 0x00, depending on the
value of \_SB_.PCI0.ISA_.FDEN, which is hard-coded to 1 (so 0x0F
always, basically :) )

I remember tinkering with that a while ago (allowing for FDEN or the
actual value of FDC0._STA to be patched in at startup, depending on
no_floppy or force_Fdctrl. I also did that for the AppleSMC entry, but I
notice that now the entire SMC is patched in conditionally, from
hw/i386/acpi-build.c. Maybe patching in the whole FDC0 node in a
similar fashion would be appropriate here as well ?


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