new fdc(4) and new fdcontrol(8) behavior (5.3-BETA5)

Rostislav Krasny rosti_bsd at
Sun Sep 26 07:32:09 PDT 2004

--- "M. Warner Losh" <imp at> wrote:
> In message: <20040921122354.73480.qmail at>
>             Rostislav Krasny <rosti_bsd at> writes:
> : Why the 3F7h port isn't used by new fdc(4) on my system? Is it a
> : hardware detection bug?
> It is a minor, hardware detection bug.  Your bios doesn't list it as a
> resource, but should.  We do use it, but we don't allocate it with the
> bus system, which is why it doesn't appear in dmesg.  A
> mostly-harmless cosmetic issue.

How the 0x3f7 port could be used without allocation? My BIOS doesn't list
0x3f0-0x3f1 ports as resurces of the PNP0700 device too, but fdc(4) use them

PNP0700: adding dma mask 0x4
PNP0700: adding io range 0x3f2-0x3f5, size=0x4, align=0
PNP0700: adding irq mask 0x40
pnpbios: handle 12 device ID PNP0700 (0007d041)

# devinfo -uv | grep -e "0x37[0-5,7]" -e "0x3f[0-5,7]"
    0x300-0x375 (root0)
    0x377 (root0)
    0x3f0-0x3f5 (fdc0)
    0x3f7 (root0)

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