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    SubjectRe: dma problems with Serverworks CSB5 chipset
    From
    > On Maw, 2004-08-03 at 19:08, Marcelo Tosatti wrote:
    >> ServerWorks OSB4/5 chipsets are known to not work reliably with the
    >> Linux
    >> IDE code. AFAIK its a hardware problem which we dont correctly work
    >> around.
    >>
    >> Have you tried disabling DMA?
    >>
    >> Bart and Alan are IDE experts, they can probably give you more useful
    >> information.
    >
    > CSB5 is reliable, rock solidly so in my experience. OSB4 was the older
    > interface with problems. Are these systems SMP, what disks are you using
    > and in what IDE mode ?
    >

    Yep, they are SMP(IBM blades with 2 Xeon 2.4Ghz). The blades use 1
    little 40g laptop drive( TOSHIBA MK4019GAXB ). The drive is running UDMA
    mode 4. Here is the output of /proc/ide/svwks:

    ServerWorks OSB4/CSB5/CSB6

    ServerWorks CSB5 Chipset (rev 93)
    ------------------------------- General Status
    ---------------------------------
    --------------- Primary Channel ---------------- Secondary Channel
    -------------
    enabled enabled
    --------------- drive0 --------- drive1 -------- drive0 ---------- drive1
    ------
    DMA enabled: yes yes no no
    UDMA enabled: yes yes no no
    UDMA enabled: 4 4 0 0
    DMA enabled: 2 2 2 2
    PIO enabled: 4 4 ? ?

    Let me know if you need any other specifics and thanks in advance for any
    advice.

    Rich

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