IDE Bus speed not detected

podollb · 10-15-2003, 10:20 PM

Should I worry about this message (dmesg give me)

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

I have a brand new laptop?

rshaw · 10-15-2003, 10:30 PM

totally normal, no worries

podollb · 10-15-2003, 11:35 PM

So is the IDE bus the speed of the cable or something? Are there IDE buses that are more than 33MHz?

andrewstr · 10-21-2003, 06:04 PM

I get the same message on my P2-350. I thought that since I use PC100 RAM, my BUS runs at 100MHz. What exactly does this message mean?

dalek · 10-21-2003, 06:29 PM

I get the same message. Somewhere later on in the boot process it cranks up to speed. That's what I read anyway.

Later

Electro · 10-21-2003, 06:48 PM

IDE controllers are connected to the PCI bus. The normal bus speed for PCI bus is 33 MHz. If you have PCI-X bus and the IDE controllers running on it then you can change it to 66 Mhz and all the way up to 133 MHz.

I think idebus=XX is the right syntax. You have to have to give at the time the boot loader switches over to the kernel.

For example

linux idebus=33

I tried 66 for idebus. It didn't take it because the hardware is limited to 33 MHz.

dalek · 10-21-2003, 07:08 PM

Is there a way to see what speed it is running at???

Curious now.

podollb · 10-21-2003, 07:23 PM

My laptop has 533FSB (which I think is referring to memory bus)and the fastest memory I could get which I think was the 333 SDRAM or may be a little higher? But I think the IDE bus is different...

The way I understand it is there is different buses but I wish I had a way to find out. I know that a PC I built a few month ago I had to switch some settings on the motherboard to get it to increase the bus speed (which I wouldn't have know or done if I didn't figure out what those little switches meant out of curiosity)