Re: [2.3.3x] ALI M15x3 chipset support (EXPERIMENTAL)

From: Andrzej Krzysztofowicz (ankry@green.mif.pg.gda.pl)
Date: Thu Jan 13 2000 - 05:34:24 EST

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Hi,

> >> 00:0f.0 IDE interface: Acer Laboratories Inc. M5229 (rev c1)
>
> >> ALI15X3: IDE controller on PCI bus 00 dev 78
> >> ALI15X3: not 100% native mode: will probe irqs later
> >> ide0: BM-DMA at 0xb400-0xb407, BIOS settings: hda:DMA, hdb:DMA
> >> ide1: BM-DMA at 0xb408-0xb40f, BIOS settings: hdc:DMA, hdd:pio
> >> hda: ST34311A, ATA DISK drive
> >> hdb: ST34311A, ATA DISK drive
> >> hdc: IBM-DJNA-351520, ATA DISK drive
> >> hdd: NEC CD-ROM DRIVE:282, ATAPI CDROM drive
> >> ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
> >> ide1 at 0x170-0x177,0x376 on irq 15
> >> ALI15X3: Ultra DMA enabled
> >> hda: ST34311A, 4126MB w/256kB Cache, CHS=8944/15/63, UDMA(33)
> >> ALI15X3: Ultra DMA enabled
> >> hdb: ST34311A, 4126MB w/256kB Cache, CHS=526/255/63, UDMA(33)
>
> Identical disks, both have DMA enabled in the BIOS and have different
> benchmark results. Strange.
>
> >> ALI15X3: Ultra DMA enabled
> >> hdc: IBM-DJNA-351520, 14664MB w/430kB Cache, CHS=29795/16/63, (U)DMA
>
> This is confusin wrt your explanation. UDMA enabled so driver believes
> that chipset is UDMA capable. But the (U)DMA indicates that the chipset
> is not UDMA capable. How can the second interface be worse than the
> first? Or is it just a reporting bug (since the driver runs _fast_ and
> it certainly looks like it uses udma).
>
> >> ALI15X3: MultiWord DMA enabled
> >> hdd: ATAPI 40X CD-ROM drive, 128kB Cache, (U)DMA
>
> OK, this was pio in bios and gets assigned multiword dma.
> But why is there the (U)DMA string again? If the drive supports UDMA
> then the bios should have initialized it to udma, right?

I am not absolutely sure, but ... isn't it an ALI's solution of the
old problem of "simplex device" ?

-- 
=======================================================================
  Andrzej M. Krzysztofowicz               ankry@mif.pg.gda.pl
  tel.  (0-58) 347 14 61
Wydz.Fizyki Technicznej i Matematyki Stosowanej Politechniki Gdanskiej
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Next message: Marco Colombo: "Re: Standard Development Integration"
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Maybe in reply to: Luca Montecchiani: "[2.3.3x] ALI M15x3 chipset support (EXPERIMENTAL)"
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