Messages in this thread | ![/](/images/icornerl.gif) | | From | Peter Chubb <> | Date | Wed, 19 Nov 2003 21:29:13 +1100 | Subject | PIIX ide driver can't disable DMA |
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Hi Folks, On an I2000 there's a PIIX5 IDE controller and a pci bridge that identifies as a 450NX rev 5. This causes the ide driver to attempt to disable DMA, to work around a limitation in the old 450NX chipset.
Unfortunately, this doesn't work, and on boot I see these messages:
piix: 450NX errata present, disabling IDE DMA. piix: A BIOS update may resolve this. Uniform Multi-Platform E-IDE driver Revision: 7.00alpha2 ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx PIIX4: IDE controller at PCI slot 0000:00:03.1 PCI: Found IRQ 0 for device 0000:00:03.1 PIIX4: chipset revision 1 PIIX4: not 100% native mode: will probe irqs later ide0: BM-DMA at 0x1070-0x1077, BIOS settings: hda:pio, hdb:pio ide1: BM-DMA at 0x1078-0x107f, BIOS settings: hdc:pio, hdd:pio hda: HITACHI DVD-ROM GD-7500, ATAPI CD/DVD-ROM drive hdb: LS-120/240 00 UHD Floppy, ATAPI FLOPPY drive Using anticipatory io scheduler ide0 at 0x1f0-0x1f7,0x3f6 on irq 34 hdc: Maxtor 6Y080L0, ATA DISK drive ide1 at 0x170-0x177,0x376 on irq 33 hdc: max request size: 128KiB hdc: 160086528 sectors (81964 MB) w/2048KiB Cache, CHS=65535/16/63, (U)DMA hdc:<4>hdc: dma_timer_expiry: dma status == 0x21 hdc: DMA timeout error
If I boot with ide1=nodma things work.
It's currently broken to try to unconfigure IDE DMA with kconfig.
Note that: 1. The PIIX5 at is not on the same PCI bus as the 450NX PXB. From lspci:
00:03.1 IDE interface: Intel Corp. 82372FB PIIX5 IDE (rev 01) 04:10.1 Host bridge: Intel Corp. 450NX - 82454NX/84460GX PCI Expander Bridge (rev 05)
2. As far as I can tell from Intel's website, the device that identifies as a 450NX is actually part of the 460GX chipset; and it's only rev 0 through 3 that have the problem (the `real' 450NX chips) (although I could easily be wrong there; it's hard to work out what the PCI revision field corresponds to in Intel's stepping chart. The bug is in steppings A0, B0 and C0.)
-- Dr Peter Chubb http://www.gelato.unsw.edu.au peterc AT gelato.unsw.edu.au The technical we do immediately, the political takes *forever* - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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