Messages in this thread | | | Date | Thu, 21 Jan 1999 19:06:08 +0200 | From | Koby Kahane <> | Subject | Are WDC AC33100H & AC31600H DMA-safe? |
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I have recently upgraded from 2.0.36 to 2.2.0-pre9
I've noticed that my boot messages say that DMA is disabled for my 2nd and 3rd hard disks. Is it safe for me to enable DMA (via hdparm) for these drive models or should I stick to none-DMA mode?
Please Cc: to me as I am not on this list.
Here are the relevant lines from the kernel boot messages:
PIIX4: IDE controller on PCI bus 00 dev 39 PIIX4: not 100% native mode: will probe irqs later ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio hda: WDC AC24300L, ATA DISK drive hdb: WDC AC33100H, ATA DISK drive hdc: WDC AC31600H, ATA DISK drive hdd: CREATIVECD1620E, ATAPI CDROM drive ide0 at 0x1f0-0x1f7,0x3f6 on irq 14 ide1 at 0x170-0x177,0x376 on irq 15 hda: WDC AC24300L, 4112MB w/256kB Cache, CHS=524/255/63, UDMA hdb: Disabling (U)DMA for WDC AC33100H hdb: DMA disabled hdb: WDC AC33100H, 3020MB w/128kB Cache, CHS=767/128/63 hdc: Disabling (U)DMA for WDC AC31600H hdc: DMA disabled hdc: WDC AC31600H, 1549MB w/128kB Cache, CHS=3148/16/63 hdd: ATAPI 16X CD-ROM drive, 240kB Cache
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