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Date: Mon, 16 Feb 1998 10:24:40 +0300 (MSK)
From: "Vasily V. Grechishnikov" <bazilio@IED-VorSTU.ac.ru>
To: FreeBSD-gnats-submit@FreeBSD.ORG
Subject: i386/5760: Re:Problem
Sender: owner-freebsd-bugs@FreeBSD.ORG
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>Number:         5760
>Category:       i386
>Synopsis:       3.0-CURRENT freezes at mount root stage on some TX MBs.
>Confidential:   no
>Severity:       serious
>Priority:       medium
>Responsible:    freebsd-bugs
>State:          open
>Quarter:
>Keywords:
>Date-Required:
>Class:          sw-bug
>Submitter-Id:   current-users
>Arrival-Date:   Sun Feb 15 23:40:04 PST 1998
>Last-Modified:
>Originator:     bazilio
>Organization:
EMCS of VorSTU.
>Release:        FreeBSD 3.0-CURRENT i386
>Environment:

	FreeBSD 3.0-CURRENT, last CVSup 10 Feb 98.
	ASUS TXP4 motherboard with TX PIIX4 IDE BM interface.
	scanpci reports about that device as:

PCI says configuration type 1

PCI probing configuration type 1
Probing for devices on PCI bus 0:

[...]

pci bus 0x0 cardnum 0x01 function 0x0001: vendor 0x8086 device 0x7111
 Intel  Device unknown
  STATUS    0x0280  COMMAND 0x0005
  CLASS     0x01 0x01 0x80  REVISION 0x01
  BIST      0x00  HEADER 0x00  LATENCY 0x20  CACHE 0x00
  BASE4     0x0000e001  addr 0x0000e000  I/O
  BYTE_0    0x07  BYTE_1  0xa3  BYTE_2  0x77  BYTE_3  0xe3

[...]

>Description:

	FreeBSD 3.0-CURRENT freezes at mount root stage on ASUS TXP4
motherboard w/ PIIX4 IDE interface. But FreeBSD 2.2.5 works properly,
and on some other MBs w/ BM IDE interfaces (IWILL P55XB2, 
XXX with VIA 571) that kernel works too. Any maniplations with flags
for wdc0 (0xa0ffa0ff -> 0), boot PROM HDD block modes/PIO modes/DMA modes
settings, External/Internal caches  didn't make anything good. 
 After full initialization kernel just reports: Considering ffs rootfs,
and system is freezes without any disk activity (HDD LED off any time
after that).
When break it to DDB we can see the following ps:

proc          addr       flags   stat wmesg wchan    cmd
0xf0221cf0    0xf025c00  000204  3    biord f2735988 swapper
				      ^^^^^
				swapper goes in that state only from
				kern/vfs_bio.c:biowait() function
				after tsleep() with indefinite timeout. 	

	I think cause of its weird behaviour is some bugs/mistakes in
PIIX BM IDE driver, or bugs in Intel TX chipset. 
>How-To-Repeat:

	boot:kernel -v
>Fix:
	
	Unavailable.


Thanks , Vasily .
 [***************[ FreeBSD - it's coolest UNIX for PCs ! ]**************]

>Audit-Trail:
>Unformatted:

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