On 24/10/2005, at 3:49, Jason Harmening wrote:
Hi,
I have a 2.3G Fujitsu MO drive, and I've gotten tired of using
atapicam to
access it. I'm thinking of writing a native ATAPI driver that
could be added
to the kernel through a configuration line like:
device atapimo
I've been doing a little work to see how feasible this is--the
kernel already
defines the ATA_ATAPI_TYPE_OPTICAL device type that is received
from my drive
during probing. But ATA_ATAPI_TYPE_OPTICAL isn't actually used
anywhere, and
there is no driver that can actually recognize and attach to an
ATAPI MO
drive.
I modified the atapifd driver (src/sys/dev/ata/atapi-fd.c) to also
recognize
ATA_ATAPI_TYPE_OPTICAL, and my drive was actually recognized during
probing
as afd0, but afd_attach returned an error. It looks as if afd_sense
() was
failing, which I'm guessing is because ATAPI MO drives (or mine, at
least)
use a different capabilities page code and/or capabilities page
structure
than ATAPI floppies. The atapi-fd driver uses 0x5 for its
"Capabilities and
Mechanical Status" page code, while everything else (atapi-cd,
atapi-tape)
uses 0x2a. All three drivers have distinctly different structures
for this
page.
So I'm wondering: do ATAPI MO drives use a capabilities page code/
structure
more like CD/DVD drives, or do they have their own unique ATAPI page
structure? If so, where can I find a document outlining the
structure?
I've found loads of documents detailing the page structure for CD/
DVD drives,
but nothing for MO drives (or floppies or tape drives for that
matter).
Also, beyond the capabilities page, are there any other special
considerations
I'd need to make for an MO driver?
I did plan to write such a driver back when, but HW seemed to have
disappeared from all the vendors I've asked so it was pu ton the
backburner.
Anyhow I should have the docs somewhere so it should be possible to
get this working...
Søren Schmidt
[EMAIL PROTECTED]
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