Continuing saga: FreeBSD -CURRENT hangs with ATA code after April

[Alexander Motin]

Joe Marcus Clarke wrote:
> On Mon, 2009-03-02 at 23:20 +0200, Alexander Motin wrote:
>> Joe Marcus Clarke wrote:
>>> I started this thread on May 31 of last year:
>>>
>>> http://lists.freebsd.org/pipermail/freebsd-current/2008-May/085923.html
>>>
>>> The problem remains as of:
>>>
>>> FreeBSD fugu.marcuscom.com 8.0-CURRENT FreeBSD 8.0-CURRENT #12: Sun Mar
>>> 1 16:10:52 EST 2009
>>> gnome at fugu.marcuscom.com:/space/obj/usr/src/sys/FUGU  i386
>>>
>>> The only way I can boot this system is to hack in the ATA code from
>>> April 9, 2008.  I would love just to be able to boot this guy on a
>>> default -CURRENT.
>> 1) If I understand right, you had working system on April 9, 2008 and 
>> not working on May 31, 2008 and now. Have you tried to narrow down that 
>> interval between working and not working system to find exact point of 
>> breakage? I see no documented changes in Promise support there in CVS 
>> log, but for example, on Apr 10 2008 I see some related changes 
>> unmentioned in commit message.
> 
> The April 9 date is the documented date of last working.  It was the
> commit on April 10 13:05:05 that broken things:
> 
> "Add experimental support for SATA Port Multipliers
> 
> Support is working on the Silicon Image SiI3124/3132.
> Support is working on some AHCI chips but far from all.
> 
> Remember this is WIP, so test reports and (constructive) suggestions are welcome!"

You can try to comment out
	/* set portmultiplier port */
	ATA_OUTB(ctlr->r_res2, 0x4e8 + (ch->unit << 8), port & 0x0f);
inside ata_promise_mio_command(). Don't know if there is some problem 
with it, but it was added at that time and looks like it is at least not 
applicable for this type of controller.

-- 
Alexander Motin