smp problems

smp problems

[Ojciec Rydzyk]

Hello!
There is a bug (I suppose) in file linux/boot/i386/kernel/mpparse.c. I
have laptop Amilo L 7300 and during the kernel boot, I get:
SMP mptable: bad table version
BIOS bug, MP table errors detectd!...

And I just even have one processor. I had to remove kernel options
connected with lapic (added previously to kernel command line).
Some time ago Alan Cox said:

"No actually its our bug. Some BIOSes contain template SMP tables which have
intentionally incomplete data and no checksum. This is used by the BIOS to
generate a real table if SMP is present.

We should not be reporting a wrongly checksummed SMP table we should be
skipping it silently. This used to be right in 2.0 but someone has obviously
elevated debugging code too far since.

Alan"
(adapted from http://www.redhat.com/archives/rhl-beta-list/2006-March/msg01144.html)

So I think it should be fixed :). Thanks,
Greetings,
Jacek Jablonski

Re: smp problems

[Alan Cox]

Ar Sul, 2006-06-18 am 12:56 +0200, ysgrifennodd Ojciec Rydzyk:
> Hello!
> There is a bug (I suppose) in file linux/boot/i386/kernel/mpparse.c. I
> have laptop Amilo L 7300 and during the kernel boot, I get:
> SMP mptable: bad table version
> BIOS bug, MP table errors detectd!...


What kernel version are you using. This should only occur on 2.4.x
unless the table is checksummed correctly

SMP problems

[Fernando Korndorfer]

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Hail!

        I'm having some problems copiling the latest kernel with SMP (and
w/o too). If I boot a SMP-enabled kernel, the system hangs after detecting
the second CPU. and I can't compile the kernel w/o SMP support (it causes a
lot of 'redefinitions'...). Can anyone help me?





Tnx, []'s
-----------------------------------------------
Fernando Korndorfer
Novo Hamburgo, RS, Brasil
-----------------------------------------------

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Re: SMP problems

[Cesar Suga]

On Thu, 21 Feb 2002, Fernando Korndorfer wrote:

>         I'm having some problems copiling the latest kernel with SMP (and
> w/o too). If I boot a SMP-enabled kernel, the system hangs after detecting
> the second CPU. and I can't compile the kernel w/o SMP support (it causes a
> lot of 'redefinitions'...). Can anyone help me?

	Which board? Some people complained about the new AMD board (with
2 Athlons) which certainly is too new to be supported (well, Athlon SMP
support is new, at least for me).

	Regards,
	Cesar Suga <sartre@linuxbr.com>
	São Caetano do Sul/SP/Brazil

Re: SMP problems

[Alan Cox]

>         I'm having some problems copiling the latest kernel with SMP (and
> w/o too). If I boot a SMP-enabled kernel, the system hangs after detecting
> the second CPU. and I can't compile the kernel w/o SMP support (it causes a
> lot of 'redefinitions'...). Can anyone help me?

make distclean when switching between SMP and non SMP builds. If the box
is hanging on detecting both processors then

-	If its a dual Athlon switch to MP 1.1 tables in the BIOS
-	Otherwise try specifying "noapic"