don'r confuse the 100 in the ATA 100 name with bus speed. the 100 refers to the peak tranfer rate in Mb/s and of course the bus speed is in MHz. Most likely your correct bus speed will be 66 MHz. look into the mobo's manual and find the pci bus speed in the specs section. that is the figure you want to add to idebus=xx
hope this helps Rob On Thursday 30 May 2002 11:56, Richie de Almeida wrote: > I got a new mobo and cpu and loaded on Mandrake 8.2 and since the ide has > UltraDMA 100 I set the boot parameter to idebus=100 but the kernel turns > this down saying its a "bad bus speed". I did a dmesg | grep 'ide' and got > this: > > BIOS-provided physical RAM map: > Kernel command line: auto BOOT_IMAGE=linux ro root=301 quiet devfs=mount > idebus=100 > ide_setup: idebus=100 -- BAD BUS SPEED! Expected value from 20 to 66 > ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx > ide0: BM-DMA at 0xd000-0xd007, BIOS settings: hda:DMA, hdb:DMA > ide1: BM-DMA at 0xd008-0xd00f, BIOS settings: hdc:pio, hdd:DMA > ...yadda yadda yadda. > > So how can I enable UltraDMA at 100MHz? > > Richie
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