This one time, at band camp, Bob Underwood said:
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> hi all,
>
> i have a new mainboard running woody with kernel 2.4.19-k7. during
> bootup, i get the following message:
>
> ide: Assuming 33MHz system bus speed for PIO modes; override with
> idebus=xx.
>
> lspci -v shows (in part) Flags: bus master, 66MHz, medium devsel,
> latency, which appears to indicate that i can safely pass idebus=66
> to the kernel. is there a way to do so with lilo? i've added
> append="idebus=66" to the append statement in the default
> configuration and to the kernel section. neither appears to pass the
> information to the kernel.
>
> i know it can be done with grub, but i've not used grub. this may
> give me the reason to change.
>
> tia,
> bob
Notice it says 'for PIO modes' rather than for DMA modes. A little
later in the boot process, you'll see something like:
PIIX4: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xfcf0-0xfcf7, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xfcf8-0xfcff, BIOS settings: hdc:DMA, hdd:pio
hda: C/H/S=0/0/3 from BIOS ignored
hda: HITACHI_DK239A-65B, ATA DISK drive
hdc: CRN-8241B, ATAPI CD/DVD-ROM drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
hda: 12594960 sectors (6449 MB) w/512KiB Cache, CHS=13328/15/63, UDMA(33)
hdc: ATAPI 24X CD-ROM drive, 128kB Cache, DMA
That'll tell you whether or not your drives actually use DMA.
HTH,
Steve
--
What passes for optimism is most often the effect of an intellectual error.
-- Raymond Aron, "The Opium of the Intellectuals"
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