Re: bin/160979: 9.0 burncd error caused by change to cd0 from ac

On Mon, Sep 26, 2011 at 6:58 PM, Doug Barton <dougb@freebsd.org> wrote:
>>
>> I have used burncd on many releases of FreeBSD, on many machines
>> without problem. =A0I can see the fact that burncd suddenly failing to
>> work on ATAPI hardware could annoy and confused end-users.
>
> It doesn't fail to work on ATAPI hardware. It fails to work on cd0 which
> is a SCSI device. The fact that it's emulated doesn't matter.

True, but the subtlety of that distinction will be lost on a lot of end-use=
rs
not familiar with the implementation of the FreeBSD storage implementation.
To them "burncd just doesn't work, when it used to".

>> Can we modify burncd to somehow detect if ATAPI-CAM is enabled, and prin=
t out
>> a more useful error message?
>
> Sure, as soon as someone volunteers to create that patch. No one is
> *trying* to annoy users, but things change around here because people
> are interested in changing them.

I am not familiar enough with the ATA_CAM work.  Is there a a sysctl or ioc=
tl
that can be queried from userspace to detect if ATA_CAM is configured
in the kernel?

I would suggest something like:

flag =3D query for hw.ata.ata_cam_enabled sysctl;

if (flag =3D=3D 1) {
        printf("ERROR: ATA_CAM enabled, etc., etc.)
        exit(1);
}

I only see these sysctls on a system with ATA_CAM enabled:

hw.ata.setmax: 0
hw.ata.wc: 1
hw.ata.atapi_dma: 1
hw.ata.ata_dma_check_80pin: 1
hw.ata.ata_dma: 1
dev.atapci.0.%desc: Intel ATA controller
dev.atapci.0.%driver: atapci
dev.atapci.0.%location: slot=3D3 function=3D2
dev.atapci.0.%pnpinfo: vendor=3D0x8086 device=3D0x29b6 subvendor=3D0x1028
subdevice=3D0x0211 class=3D0x010185
dev.atapci.0.%parent: pci0
dev.ata.2.%desc: ATA channel 0
dev.ata.2.%driver: ata
dev.ata.2.%location: channel=3D0
dev.ata.2.%parent: atapci0
dev.ata.3.%desc: ATA channel 1
dev.ata.3.%driver: ata
dev.ata.3.%location: channel=3D1
dev.ata.3.%parent: atapci0
dev.ata.0.%driver: ata
dev.ata.0.%parent: isa0
dev.ata.1.%driver: ata
dev.ata.1.%parent: isa0

--=20
Craig Rodrigues
rodrigc@crodrigues.org
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