mtv at theor.chemistry.gatech.edu
Mon Apr 16 12:21:15 EDT 2001
> You almost certainly *don't* want to do that. idebus is the speed of your
> PCI bus, which is probably 33 MHz. That's kinda a confusingly named option
> -- lots of people seem to think it has something to do with ATA/33 vs ATA/66
> vs ATA/100, but it doesn't. See drivers/ide/ide.c....
Definitely correct. Sorry for the confusion.
* ide_system_bus_speed() returns what we think is the system VESA/PCI
* bus speed (in MHz). This is used for calculating interface PIO timings.
* The default is 40 for known PCI systems, 50 otherwise.
* The "idebus=xx" parameter can be used to override this value.
* The actual value to be used is computed/displayed the first time through.
* "idebus=xx" : inform IDE driver of VESA/PCI bus speed in MHz,
* where "xx" is between 20 and 66 inclusive,
* used when tuning chipset PIO modes.
* For PCI bus, 25 is correct for a P75 system,
* 30 is correct for P90,P120,P180 systems,
* and 33 is used for P100,P133,P166 systems.
* If in doubt, use idebus=33 for PCI.
* As for VLB, it is safest to not specify it.
But now, I am more confused. Here are the specs for my board:
1.ALi M1542 Aladdin V AGPset
2.SupportsUltra DMA/33IDE protocol
3.SupportsAGP 66MHz/133MHz (Sideband) 3.3Vdevice
Isn't my PCI bus speed faster than 33MHz?
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