kern/127391: [ata] Intel 6300ESB SATA150 cannot find disk and boot under 6.3 [regression]

[John Baldwin]

The following reply was made to PR kern/127391; it has been noted by GNATS.

From: John Baldwin <jhb at freebsd.org>
To: "Corey Smith" <corsmith at gmail.com>
Cc: bug-followup at freebsd.org, satz at iranger.com
Subject: Re: kern/127391: [ata] Intel 6300ESB SATA150 cannot find disk and boot under 6.3 [regression]
Date: Wed, 12 Nov 2008 11:10:47 -0500

 On Wednesday 12 November 2008 09:29:14 am Corey Smith wrote:
 > Attached is a patch again 6-STABLE from yesterday that fixes the
 > problem on my Dell PowerEdge 750 with an Intel 6300ESB.
 > 
 > Effectively this patch reverses this commit by jhb on 2007/06/29:
 > 
 > 
 http://www.freebsd.org/cgi/cvsweb.cgi/src/sys/i386/isa/clock.c.diff?r1=1.222.2.2;r2=1.222.2.3;only_with_tag=RELENG_6
 > 
 > I found this by checking out different dates between the 6.2 and 6.3
 > release dates for 6-STABLE until I found the commit that causes the
 > hard drive to go undetected.
 > 
 > To test patch, checkout the latest 6-STABLE and:
 > 
 > cat src-sys-i386-isa-clock-c_against-6-4-PRERELEASE.patch | patch -d /usr
 > 
 > The patch is untested on 7-STABLE but I'm sure that removing the same
 > function will fix that branch as well.  I do know that 7.0-RELEASE and
 > 7.1-BETA2 exhibit the same regression.
 > 
 > -Corey Smith
 
 So what the change does is merge a change from HEAD to change how DELAY() 
 works.  Instead going out to the RTC (expensive) it sits in a spin loop 
 polling the TSC.  Can you narrow down a specific DELAY() call in ATA that has 
 a problem?  Also, are you using 'device cpufreq' at all?
 
 -- 
 John Baldwin