device ada n/ in kernconf, how to omitt for hv_storvsc.ko

[Harald Schmalzbauer]

Hello,

I'm experimenting with MS-Hyper-V and saw that as soon as hv_storvsc.ko
is loaded, an IDE hdd attaches as 'da' _and_ 'ada' (the former seems to
be called “FastIDE” on “synthetic storage driver” and gains efficiency
for HDD workloads).

There's the hv_pci_ata_disengage.ko pseudo driver, but that also makes
IDE cdrom unavailable – same as disabling ata/atapci! Can't really get
the idea of that module…

I'd prefere to disable 'ada' only (leaving cdrom via atapci->ATA_CAM->cd).
But I can't find the place where “device ada” gets defined for kernel
conf. “device ata” is in GENERIC, along with da, sa, scbus etc., but no
'ada' ?!?. No trace of 'ada' in DEFAULTS either!?!

Is there something like hint.ada.disable=1 ?
Can I use “nodevice ada“ to exclude it from my custom kernel?

Thanks,

-Harry

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