Hi,

with this patch, the problem still exists.

ata1.01: XXX debounce start, SStatus=4
ata1.01: XXX debounce done, SStatus=4, DET stable for 520 msecs
ata1.00: SATA link down (SStatus 0 SControl 301)
ata1.01: SATA link down (SStatus 0 Scontrol 300)
...
VFS; cannot open root device ...

The kernel just panic, and I can't see what's the messege printing before 
that.

So, I tried 'console=ttyS0 console=tty1'，full dmesg attached。

$ hdparm -I /dev/sda:

/dev/sda:

ATA device, with non-removable media
        Model Number:       WDC WD800JD-60LSA5                      
        Serial Number:      WD-WCAM9T882872                         
        Firmware Revision:  10.01E03                                
Standards:                                                          
        Supported: 7 6 5 4                                          
        Likely used: 8                                              
Configuration:                                                      
        Logical         max     current                             
        cylinders       16383   16383                               
        heads           16      16                                  
        sectors/track   63      63                                  
        --                                                          
        CHS current addressable sectors:   16514064                 
        LBA    user addressable sectors:  156301488                 
        LBA48  user addressable sectors:  156301488                 
        device size with M = 1024*1024:       76319 MBytes          
        device size with M = 1000*1000:       80026 MBytes (80 GB)  
        cache/buffer size  = 8192 KBytes                            
Capabilities:                                                       
        LBA, IORDY(can be disabled)                                 
        Standby timer values: spec'd by Standard, with device specific 
minimum
        R/W multiple sector transfer: Max = 16  Current = 16                  
        DMA: mdma0 mdma1 mdma2 udma0 udma1 udma2 udma3 udma4 *udma5           
             Cycle time: min=120ns recommended=120ns                          
        PIO: pio0 pio1 pio2 pio3 pio4                                         
             Cycle time: no flow control=120ns  IORDY flow control=120ns      
Commands/features:                                                            
        Enabled Supported:                                                    
           *    SMART feature set                                             
                Security Mode feature set                                     
           *    Power Management feature set                                  
           *    Write cache                                                   
           *    Look-ahead                                                    
           *    WRITE_BUFFER command                                          
           *    READ_BUFFER command                                           
           *    NOP cmd                                                       
           *    DOWNLOAD_MICROCODE                                            
           *    48-bit Address feature set                                    
           *    Device Configuration Overlay feature set
           *    Mandatory FLUSH_CACHE
           *    FLUSH_CACHE_EXT
           *    SMART error logging
           *    SMART self-test
           *    General Purpose Logging feature set
           *    SATA-I signaling speed (1.5Gb/s)
           *    SATA-II signaling speed (3.0Gb/s)
           *    Phy event counters
                Device-initiated interface power management
           *    Software settings preservation
           *    SMART Command Transport (SCT) feature set
           *    SCT Long Sector Access (AC1)
           *    SCT LBA Segment Access (AC2)
           *    SCT Error Recovery Control (AC3)
           *    SCT Features Control (AC4)
           *    SCT Data Tables (AC5)
                unknown 206[12] (vendor specific)
Security:
        Master password revision code = 65534
                supported
        not     enabled
        not     locked
                frozen
        not     expired: security count
                supported: enhanced erase
        24min for SECURITY ERASE UNIT. 24min for ENHANCED SECURITY ERASE 
UNIT.
Checksum: correct

Thanks.

On Wed, 23 Dec 2009, Tejun Heo wrote:

> Hello,
> 
> On 12/22/2009 11:02 AM, fengxiangjun wrote:
> > You are right, it's definitely timing related.
> > 
> > I just tried capturing the failed booting message through a null modem 
> > cable, but the problem goes away! It seems that I can't reproduce it 
> > with serial console attached.
> 
> Hmmm... this is the second report of probing failure with SIDPR based
> hardreset.  Can you please apply the attached patch and see whether
> the problem is reproducible?  And if so, please attach full boot log.
> Can you please also attach hdparm -I output of the occassionally
> failing drive.
> 
> Thanks.
> 
> -- 
> tejun
> 
---------------------------------------------------------------------------------------------------
Confidentiality Notice: The information contained in this e-mail and any accompanying attachment(s) 
is intended only for the use of the intended recipient and may be confidential and/or privileged of 
Neusoft Corporation, its subsidiaries and/or its affiliates. If any reader of this communication is 
not the intended recipient, unauthorized use, forwarding, printing,  storing, disclosure or copying 
is strictly prohibited, and may be unlawful.If you have received this communication in error,please 
immediately notify the sender by return e-mail, and delete the original message and all copies from 
your system. Thank you. 
---------------------------------------------------------------------------------------------------