Text 3239, 56 rader
Skriven 2010-11-29 02:15:32 av Allan
Ärende: Re: Strange trap in OS2KRNL on boot - solved ? Maybe ...
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From: "Allan" <allan2@warpspeed.dyndns.dk>

On Sun, 28 Nov 2010 19:43:16 UTC, "Doug Bissett"
<dougb007!SPAM@Use-Author-Supplied-Address.invalid> wrote: 

> On Sun, 28 Nov 2010 12:31:26 UTC, Lars Erdmann <lars.erdmann@arcor.de>
> wrote:
> 
> > Doug Bissett wrote:
> > > On Sat, 27 Nov 2010 11:57:17 UTC, Lars Erdmann<lars.erdmann@arcor.de>
> > >
> > > I am pretty sure that the BIOS is supposed to write good data through
> > > all of memory, even if you do the quick test.
> > 
> > I don't think so. That's exactly what makes "Quick Power On self test"
> > quick. It does not write to all memory but only to a fraction (the fraction
> > used by DOS). You can tell the difference between writing and reading back
> > to only 640k or to the whole 2GB.
> > 
> > 
> > Lars
> 
> No, that isn't right. A quick test simply writes all zeros, and reads 
> it, then it writes all ones, and reads it, end of test, but at that 
> point everything should be in good parity (the zero and one tests may 
> be the other way around). An extended test does those two, then does 
> half a dozen pattern writes, and reads before it is finished. Of 
> course, different BIOS implementations might do it a little different.
> One thing, for sure, is that by the time an operating system gets 
> booted, all of memory should be in good parity. If it is not, there is
> something wrong.
> 

BIOS doesn't do RAM testing, if Quick boot is enabled, and that is the
standard of most PC's. The test/initialazation  it does when doing 'slow' 
boot is quite useless. I've had many bad RAM's over the years - and almost
always run in the slow boot mode - but BIOS have never complained, where
Memtest have found many problems in RAM, when such test is run.

It is actually a job for the OS, to initialise RAM, to be sure it is setup as
expected.
OS4LDR have implemented this feature - to 0 all cells at init.

Try it....


-- 
  Allan.

It is better to close your mouth, and look like a fool,
than to open it, and remove all doubt.

--- Internet Rex 2.31
 * Origin: Datemas.de http://www.news.datemas.de (1:261/20.999)