idebus=xx on a ISA only 486

idebus=xx on a ISA only 486

[monkeyiq]

Hi,
    This may be harmless but I noticed a warning msg when I went to
2.4.3 on a ISA only 486 mobo.

Feb 18 18:01:41 speedy kernel: ide: Assuming 50MHz system bus speed for
PIO modes; override with idebus=xx

My first thought was to drop idebus to 8Mhz (I think this is the
ISA speed ?),
but using that
Feb 18 18:01:41 speedy kernel: Kernel command line: auto BOOT_IMAGE=243
ro root=301 BOOT_FILE=/boot/vmlinuz-2.4.3 idebus=8
Feb 18 18:01:41 speedy kernel: ide_setup: idebus=8 -- BAD BUS SPEED!
Expected value from 20 to 66

and then a quick grep/poke in the src gave this

./drivers/ide/ide.c
Version 5.50         allow values as small as 20 for idebus=

and at line 350 it seems that its pci or nothing for the bus speed.

the only deterministic problem (so far that I can directly attribute to
that kernel) with the
2.4.3 booted kernel is that ssh2 locks up for random amounts of time at
randomish intervals.

I can't seem to dig up other info on this problem, I am sorry if this is
the wrong place
to ask. If there are better places to be looking for this data I am
happy to RTFM there.

Now trying 2.4.3-ac6 to see what happens there.



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---------------------------------------------------
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Re: idebus=xx on a ISA only 486

[Vojtech Pavlik]

On Mon, Apr 16, 2001 at 10:42:12PM +1000, monkeyiq@dingoblue.net.au wrote:
> Hi,
>     This may be harmless but I noticed a warning msg when I went to
> 2.4.3 on a ISA only 486 mobo.
> 
> Feb 18 18:01:41 speedy kernel: ide: Assuming 50MHz system bus speed for
> PIO modes; override with idebus=xx
> 
> My first thought was to drop idebus to 8Mhz (I think this is the
> ISA speed ?),
> but using that
> Feb 18 18:01:41 speedy kernel: Kernel command line: auto BOOT_IMAGE=243
> ro root=301 BOOT_FILE=/boot/vmlinuz-2.4.3 idebus=8
> Feb 18 18:01:41 speedy kernel: ide_setup: idebus=8 -- BAD BUS SPEED!
> Expected value from 20 to 66
> 
> and then a quick grep/poke in the src gave this
> 
> ./drivers/ide/ide.c
> Version 5.50         allow values as small as 20 for idebus=
> 
> and at line 350 it seems that its pci or nothing for the bus speed.
> 
> the only deterministic problem (so far that I can directly attribute to
> that kernel) with the
> 2.4.3 booted kernel is that ssh2 locks up for random amounts of time at
> randomish intervals.
> 
> I can't seem to dig up other info on this problem, I am sorry if this is
> the wrong place
> to ask. If there are better places to be looking for this data I am
> happy to RTFM there.
> 
> Now trying 2.4.3-ac6 to see what happens there.

idebus= isn't used in case there is no VL-BUS or PCI bus in your system.

-- 
Vojtech Pavlik
SuSE Labs