when is overriding idebus safe?

when is overriding idebus safe?

[dmeyer]

The kernel always says:

ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx

at boot time.  How would I know if it's safe to say idebus=66?  The
documentation is fairly vague on this.

    Thanks,
    Dave

-- 
David M. Meyer
dmeyer@dmeyer.net
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Re: when is overriding idebus safe?

[mirabilos]

I get:

ide: Assuming 40 MHz system bus speed for PIO modes; override with idebus=xx

??? you all say it's 33 hardcoded...

-----BEGIN GEEK CODE BLOCK-----
Version: 3.12+custom(^=href;C-style-comments)
GO/S dx@ s--: a--->---- C++ UL++++ P--- L++$(-^lang) E----/joe W+(++)
N? o K? w-(+$) O+>+++ M-- V- PS+++@ PE(--) Y+ PGP t+ 5? X+ R+ !tv!----
b++++* DI- D+ G(>++) e(^age) h! r(-) y--(!y+) /* lang=NASM, GW-BASIC, C */
------END GEEK CODE BLOCK------


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Re: when is overriding idebus safe?

[Andre Hedrick]

On Wed, 24 Jan 2001 dmeyer@dmeyer.net wrote:

> The kernel always says:
> 
> ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
> 
> at boot time.  How would I know if it's safe to say idebus=66?  The
> documentation is fairly vague on this.

When the manual for your mainboard states that clock settings for setting
up your CPU creates a change in the normal idebus=33MHz of any other
value, then you are probablely safe.  Since all 32-bit PCI busses run at
33MHz, as last thought and reported, it should not be needed to change.
If I recall the idebus=XX primary use was for VLB/ISA/EISA systems, but I
have been wrong before.

Chers,

Andre Hedrick
Linux ATA Development

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Re: when is overriding idebus safe?

[Andre Hedrick]

Because you do not have IDE_PCI enabled.

On Wed, 24 Jan 2001, mirabilos wrote:

> I get:
> 
> ide: Assuming 40 MHz system bus speed for PIO modes; override with idebus=xx
> 
> ??? you all say it's 33 hardcoded...
> 
> -----BEGIN GEEK CODE BLOCK-----
> Version: 3.12+custom(^=href;C-style-comments)
> GO/S dx@ s--: a--->---- C++ UL++++ P--- L++$(-^lang) E----/joe W+(++)
> N? o K? w-(+$) O+>+++ M-- V- PS+++@ PE(--) Y+ PGP t+ 5? X+ R+ !tv!----
> b++++* DI- D+ G(>++) e(^age) h! r(-) y--(!y+) /* lang=NASM, GW-BASIC, C */
> ------END GEEK CODE BLOCK------
> 
> 
> -
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@vger.kernel.org
> Please read the FAQ at http://www.tux.org/lkml/
> 

Andre Hedrick
Linux ATA Development

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Re: when is overriding idebus safe?

[Stefan Ring]

On Wed, 24 Jan 2001, Andre Hedrick wrote:

> When the manual for your mainboard states that clock settings for setting
> up your CPU creates a change in the normal idebus=33MHz of any other
> value, then you are probablely safe.  Since all 32-bit PCI busses run at
> 33MHz, as last thought and reported, it should not be needed to change.
> If I recall the idebus=XX primary use was for VLB/ISA/EISA systems, but I
> have been wrong before.

My system bus is overclocked to 40MHz. Should I use idebus=44MHz now or
should I stick with the default? How does the value given affect kernel
behaviour?

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