downgrading /sys/src

[Mario Lobo]

On Saturday 31 May 2008 18:05:24 Dominique Goncalves wrote:
> Hi,
>
> On 5/31/08, Mario Lobo <mlobon at ig.com.br> wrote:
> > This may sound wierd but let me explain why.
> >
> > On last may/26,  I added a Sound Blaster Live to my machine and I wanted
> > to activate the midi interface of the emu10kx driver. I know there were
> > some memory and timming problems but I wanted to experiment. So I did a
> > csup to 7_CURRENT (which is the tag I always use) then edited emu10kx to
> > coment out the #if 0 that excludes the midi code. I took the oportunity
> > to coment the drivers I did not need to make the kernel smaller.
> > Recompiled and loaded emu10kx from loader.conf.  the Kernel crashed right
> > after the acpi_hpet driver load.  But by loading emu10kx later, there was
> > no crash and SB board worked fine.
> >
> > A hunch told me to save kernel.old so I moved it to kernel.good which is:
> > FreeBSD lobo 7.0-STABLE FreeBSD 7.0-STABLE #1: Thu May 22 18:32:28 BRT
> > 2008 root at lobo:/usr/src/sys/i386/compile/LOBO  i386
> >
> > After that I went on to make some DVD backups with k3b which ALWAYS
> > worked fine and now, after this upgrade, k3b keeps crashing without
> > finishing. Software and device buffers usage behaved erratically, and
> > even if it doesn't crash, it stops in around 30% with a write error. I
> > lost a few DVDs, since I suspected the DVD+RW may have had something to
> > do with the problem. I recompiled k3b (and the other ports around it) but
> > results were the same.
> >
> > Anyway, after several unsuccessful attempts to correct the problem by
> > removing/re-adding kernel drivers, recompiles and even removing the SB
> > board, I decided to move /boot/kernel to kernel.new, and copied
> > kernel.good to kernel and voilá ! Everything went back to normal and
> > worked fine!
> >
> > What I want to do is to make a copy of my current /src/sys, revert it
> > back to what it was in may/22 (kernel.good) and compare it with the
> > current /src/sys to see what changed that provoked this behavior. I
> > suspect of ata and memory handling changes but it's just a guess. I'd
> > have to have both sources to compare.
> >
> > So my question is: How can I get my /src/sys back to what it was in
> > may/22? can this be done?
>
> You could use the 'date=' option in your stable-supfile:
> *default release=cvs tag=RELENG_7 date=20080522000000
>
> man 1 csup for more details
>
> Hope this helps
>

Thanks ! that did it !!

but the date format should so:

date=2008.05.22.00.00.00

I am going to dig in and see if I can find out what happened.

-- 
Mario Lobo
http://www.mallavoodoo.com.br
FreeBSD since version 2.2.8 [not Pro-Audio.... YET!!] (99,7% winedows FREE)