linux-kernel - Re: 2.6.23: does it supposed to work on an i486?

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Message-ID: <4750519C.2000907@zytor.com>
Date:	Fri, 30 Nov 2007 10:08:28 -0800
From:	"H. Peter Anvin" <hpa@...or.com>
To:	Michael Tokarev <mjt@....msk.ru>
CC:	linux-kernel@...r.kernel.org, stable@...nel.org
Subject: Re: 2.6.23: does it supposed to work on an i486?

Michael Tokarev wrote:
> I tried to upgrade one of our ooooold machines
> (used as print servers and similar tasks) today
> from 2.6.22 to 2.6.23[.9].  The same config (with
> minor tweaks for new options), i486 base arch,
> X86_GENERIC=y.
> 
> The result is immediately machine reboot right
> after bootloader (etherboot) passes control to
> the kernel -- BEFORE "Uncompressing linux"
> message.
> 
> 2.6.22 worked just fine.
> 
> So I wonder if it's supposed to work in the first
> place.  The thing is that this machine(s) are very
> slow to boot, so trying to figure out which change
> is at question will require quite some time...

It looks like 2.6.23.9 is missing checkin 
7ed192906a2144ebc8ca2925a85d27b9c5355668 from Linus' tree (attached), 
which is necessary to work on 386 and 486.

	-hpa

View attachment "0001-x86-setup-add-a-near-jump-to-serialize-cr0-on-386.patch" of type "text/x-patch" (1047 bytes)