Sender:	root AT squid DOT netplus DOT net
Message-ID:	<379AE22E.DB97A916@netplus.net>
Date:	Sun, 25 Jul 1999 05:08:46 -0500
From:	Steve Bergman <steve AT netplus DOT net>
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To:	pgcc AT delorie DOT com
Subject:	Re: pgcc and linux-2.2.9 DMA problem
References:	<37911716 DOT 7A691225 AT netplus DOT net> <Pine DOT SOL DOT 3 DOT 96 DOT 990718012951 DOT 11121C-100000 AT ursa DOT cus DOT cam DOT ac DOT uk> <19990720095916 DOT N263 AT cerebro DOT laendle>
Reply-To:	pgcc AT delorie DOT com

Marc Lehmann wrote:

> On Sun, Jul 18, 1999 at 01:59:47AM +0100, Dr H. T. Leung wrote:
> > Hmmm; the linux kernel source tree has always been a bit touchy about
> > being compiled with optimization or by anything other than gcc/egcs (I
>
> gcc, you mean. for pgcc and egcs (2.95 prerelease) you need to switch off
> aliasing at least.

I am happy to report that my original problem with UDMA and the Mandrake
kernel has *nothing* to do with pgcc. :-)  Mandrake uses the  -A1 option to
hdparm which turns on hardware read look ahead, which I normally did not do
with RedHat 6.0 (where everything worked fine).  This seems to be the
problem.  With -A1 removed, it works perfectly.

BTW, while messing with this problem, I tried compiling the kernel with no
optimization.  It seems that I have heard that this does not work, and
indeed, it only gets a few seconds into the compile before dying.  Does this
fact strike anyone else as odd?

-Steve

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