Re: Sending ATA commands?

[Brian Buhrow <buhrow%nfbcal.org@localhost>]

        Hello.  What does your support do?  Does it let you write over the
host protected area?  Does it let you extract what's in there?  Sorry for
the silly questions, but I'm not sure what this support buys you.  It
sounds great, but I'm not sure what I'd get by making this work in 5.x or
beyond?
-thanks
-Brian

On Aug 11, 12:42am, Mouse wrote:
} Subject: Re: Sending ATA commands?
} In case anyone cares....
} 
} Back on
} 
} > Date: Sat, 10 Aug 2013 01:13:12 -0400 (EDT)
} 
} I wrote to the list asking about some peculiar issues trying to
} implement HPA support for 4.0.1.  Thanks to a very perceptive kre, I
} got over that hump (I got careless and didn't quite follow the
} interface specified; the results actually make sense in view of the way
} I didn't).
} 
} I now have minimal HPA support working.  Here's a dmesg extract from
} the latest boot of my test machine:
} 
} wd0 at atabus3 drive 0: <QUANTUM FIREBALLP KA9.1>
} wd0: drive supports 16-sector PIO transfers, LBA addressing
} wd0: HPA enabled, protected area present
} wd0: effective capacity raised from 18039071 to 18041184
} wd0: 8809 MB, 17898 cyl, 16 head, 63 sec, 512 bytes/sect x 18041184 sectors
} wd0: 32-bit data port
} wd0: drive supports PIO mode 4, DMA mode 2, Ultra-DMA mode 4 (Ultra/66)
} 
} So, if anyone wants rudimentary HPA support for 4.0.1, it now exists.
} I intend to put this into 5.2 as well; I don't know whether 6.* and/or
} -current have it, but, if not, anyone who cares to is welcome to pick
} this up and look at it as a possible basis for something there.
} 
} It currently is available only two ways.  One is on request from me, of
} course; I can mail out a patchset.  The other is a git repo.  I have
} 4.0.1's src in a git repo, with these changes being commits
} 8ceee48..65301ff in that repo - I broke it up into six changesets,
} adding support before using it.  So, for those who have git, the disk
} space (a little over a gig, with a fully-checked-out working tree), and
} the patience to wait for git to fetch it, you can get it by cloning
} git://git.rodents-montreal.org/Mouse/netbsd-fork/4.0.1/src.
} 
} Here are the one-line summaries.  Except for 53fe079, the commit
} messages are only one line long; 53fe079's explains how the interface
} in question is ugly.
} 
} * 65301ff Add HPA support to the wd driver.
} * 53fe079 Add AT_READREG48, which reads current-and-previous register values. 
 Ugly interface.
} * a915892 Add WDCTL_HOB, which makes reads of some registers read `previous' 
values.
} * 19f8f04 Add AT_NORESEL, to suppress the wd_sdh-destroying write in 
__wdccommand_intr.
} * e9d3f6b Add HPA-relevant WDC_ and WDCC_ definitions.
} * 5d1dd61 Peculiar spurious whitespace (before end-of-statement ;) cleanup.
} 
} Next up: DCO support. :-)
} 
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