No more floppy drive

Nate Lawson nate at
Wed Aug 25 16:28:09 PDT 2004

M. Warner Losh wrote:
> In message: <412D12D4.1000401 at>
>             Nate Lawson <nate at> writes:
> : There are only two ways currently to find fd0 on ISA systems: ACPI _FDE 
> : probing and hints.  The acpi probe automatically falls back to the hints 
> : system if _FDE fails so you should leave the hint.fd.0 lines in but 
> : comment out hint.fdc lines (as you've done).
> I think this is a bad idea, but may be what we have to do for 5.3.  We
> can find out what drives are on the system by asking the rtc() if
> there's no _FDE, which is what the old, pre-acpi code did (which is
> why people are seeing their drives disappear now).

This is incorrect.  The acpi commits did not remove any rtc probe; there 
never was one.  There were only two commits by me to fdc.c so check them 
out to see what I mean.  All I did was move the existing hints probe 
into its own function, fdc_hints_probe().  The easiest way to see how 
fdX gets probed is to look for callers to fdc_add_child().  They are 
fdc_acpi_probe_children() and fdc_hints_probe().  The latter is called 
by the ISA attachment or the ACPI attachment if the _FDE method is not 
present.  (BTW, it seems the pccard attachment doesn't probe this way?)


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