On Wed, 29 May 2002 23:56:23 -0400
Richie de Almeida <[EMAIL PROTECTED]> 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?
This seems to come up every month.
I do not at the moment feel like going in to lengthy detail, so if you
want details check the Archives, newbie or expert, and look for
responses from either myself or Tom Brinkman regarding bus speed.
The short version is that 33mhz for PIO mode Is Correct and specifically
for PIO
devices, cdrom,cdrw, etc, and not a designation of your hd speed.
On your system hda,hdb and hdd are all DMA.
Only hdc is PIO.
If you watch the entire boot sequence when the breakdown of your drives
is given your hds will list as DMA mode 5 which Is 100mhz.
Charles
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