[parisc-linux] Bus Speed

[parisc-linux] Bus Speed

[marc]

When Linux starts up I see a message saying:

ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx

I have a C180 and the bus speed at startup says:

Central Bus Speed (in MHz) :        120

so I'm assuming I should add the boot parameter as mentioned above.
Will I see any performance gain?

Thanks,
-Marc

Re: [parisc-linux] Bus Speed

[Alan Cox]

On Sat, 2002-09-07 at 21:49, marc wrote:
> When Linux starts up I see a message saying:
> 
> ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
> 
> I have a C180 and the bus speed at startup says:
> 
> Central Bus Speed (in MHz) :        120
> 
> so I'm assuming I should add the boot parameter as mentioned above.
> Will I see any performance gain?

I doubt the 120Mhz clock is run to non PCI IDE devices. The PARISC port
should be setting the IDE base clocking itself.

Re: [parisc-linux] Bus Speed

[Grant Grundler]

"marc " wrote:
> ide: Assuming 50MHz system bus speed for PIO modes; override with idebus=xx
> I have a C180 and the bus speed at startup says:
> Central Bus Speed (in MHz) :        120

There is no IDE on C180 unless you've added a PCI card that has it.
Only systems with SuckyIO have built-in IDE where HPUX officially
only supports CD-ROM. Of course, under linux we can do what we want.

"Central Bus" in this case is the "Runway" bus.
Only CPU, Memory Controller and IO Controller (U2) are on Runway bus. 

grant