[RELENG_5_3] Strange timeout of mpt(4) with disk array

[Xin LI]

Still has the problem, on more hardware.  Some more information:
	- One of these disk arries works well under 160M/s mode and RELENG_4
	- One of these disk arries does not work at all under FreeBSD
	- Both of them works well under Linux and OpenBSD 3.6 (snapshot, i386)

I'm trying to figure out why.  It seems that OpenBSD's mpt(4) did something
different from ours, however, I have hit some trouble porting their code
due to busdma interface difference.

I have a preliminary hacked port of OpenBSD's ``new'' features (without the
firmware feature) but the result is not quite hearten.  I try to do a more
in-depth attempt on this.

On Mon, Oct 25, 2004 at 02:15:27PM +0800, Xin LI wrote:
> The message I got from the console (hand-copyed and typed)
> mpt1: timeout on request index=0xf0 sequence=0x00000084
> mpt1: status 00000001; mask 00000001; Doorbell 24000000
> request state on chip
> 
> SCSI IO Request @ 0xe4ad5c5c
> 	Chain Offset	0x00
> 	MsgFlags	0x00
> 	MsgContext	0x000000fe
> 	Bus:		0
> 	TargetID:	0
> 	SenseBufferLength:	18
> 	LUN:		0x2
> 	Control:	0x02000500 READ UNTAGGED
> 	DataLength	0x00000024
> 	SenseBufAddr	0x3e64ade0
> 	CDB[0:6]	12 40 00 00 24 00
> 	SE32		0xe4da9030; Addr=0x854884 FlagLength=0xd1000024
> 		LAST_ELEMENT END_OF_BUFFER END_OF_LIST

Cheers,
-- 
Xin LI <delphij frontfree net>	http://www.delphij.net/
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