cvs commit: src/sys/dev/fdc fdc_acpi.c

[Nate Lawson]

Andre Oppermann wrote:
> Nate Lawson wrote:
>>njl         2004-07-28 22:35:41 UTC
>>
>>  FreeBSD src repository
>>
>>  Modified files:
>>    sys/dev/fdc          fdc_acpi.c
>>  Log:
>>  Fix ACPI floppy enumeration for three types of divergent behavior.
>>  * Some systems have _FDE and child floppy devices, but no _FDI.  This seems
>>    to be compatible with the standard.  Don't error out if there is no _FDI.
>>    Instead, continue on to the next device.  The normal fd probe will take
>>    care of this device.
>>  * Some systems have _FDE but no child devices in AML.  For these, add a
>>    second pass that compares the results of _FDE to the presence of devices.
>>    If not present, add the missing device.
>>  * Some BIOS authors didn't read the spec.  They use tape drive values for
>>    all fdc(4) devices.  Since this isn't grossly incompatible with the
>>    required boolean value, use them.  They also define the _FDE items as a
>>    package instead of buffer.  Regenerate the buffer from the package if it
>>    is present.
>>
>>  Tested by:      tjr, marcel
> 
> Is there any kind of feedback chain towards the BIOS authors so they might
> fix it in the next release?

A few people had success getting problems with a ServerWorks board fixed 
in the next BIOS revision.  But most of the time, the chance is 0.  All 
we can do is work around the issue (like here) or disable it for the 
given board (Windows often does this also).

-Nate