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Date: Wed, 21 May 2008 09:08:24 +0800 From: gshan <gshan@...atel-lucent.com> To: "Maciej W. Rozycki" <macro@...ux-mips.org> CC: linux-kernel@...r.kernel.org Subject: Re: PIIX4 DMA Timeout Maciej W. Rozycki wrote: > 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 > board? > > Maciej > Maciej, thank you very much for your reply. I don't think this was caused by interrupt routing. I added lots of "printk" before following output, and saw interrupts could be triggered correctly. hdc: 195371568 sectors (100030 MB) w/7539KiB Cache, CHS=16383/255/63, UDMA(33) LynxOS has been run successfully on this board, and we want port it to Linux recently. I'm not sure which resource (I/O or Memory space) should be used for DMA operation because all memory resources haven't been set (the flag is 0x2xxxxxxx). So my question is DMA operation could succeed with I/O resource? -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.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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