Re: PIIX4 DMA Timeout

From: Maciej W. Rozycki
Date: Tue May 20 2008 - 12:54:50 EST

On Tue, 20 May 2008, Gavin Shan wrote:

> There has one MV64460 on my board, which includes 2 PCI bridges. PIIX4 is on slot 3 of PCI1.
> But now, IDE driver reported it's timeouted on DMA operation. Thanks in advance for your
> suggestions.
> PIIX4: chipset revision 1
> PIIX4: not 100% native mode: will probe irqs later
> ide0: BM-DMA at 0xd8000000-0xd8000007, BIOS settings: hda:pio, hdb:pio
> ide1: BM-DMA at 0xd8000008-0xd800000f, BIOS settings: hdc:pio, hdd:pio
> hdc: HTE721010G9AT00, ATA DISK drive
> hdc: max request size: 512KiB
> hdc: 195371568 sectors (100030 MB) w/7539KiB Cache, CHS=16383/255/63, UDMA(33)
> hdc: cache flushes supported
> hdc:<4>hdc: dma_timer_expiry: dma status == 0x26
> hdc: DMA interrupt recovery
> hdc: lost interrupt
> hdc: dma_intr: status=0x58 { DriveReady SeekComplete DataRequest }
> ide: failed opcode was: unknown
> hdc: DMA disabled
> ide1: reset: success
> hdc2 hdc3 hdc4

It looks like some problem with interrupt routing. At least with some of
the PIIX chips I recall there was some limitation about how the IDE
interrupts had to be used for DMA to be operational. For PIO modes there
were no restrictions. Do you have chip-level documentation for your

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