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hi all. During boot my gentoo kernel reports that dma on my hard disks is set to off. When (as root) I try to set it to on, this happens: ...
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  1. 01-21-2004 #1
    variant
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    hdparm dma 1 operation not permitted

    hi all.

    During boot my gentoo kernel reports that dma on my hard disks is set to off. When (as root) I try to set it to on, this happens:


    Code:
    hdparm -d1 /dev/hdb

/dev/hdb:
 setting using_dma to 1 (on)
 HDIO_SET_DMA failed: Operation not permitted
 using_dma    =  0 (off)
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  2. 01-22-2004 #2
    Hellmasker
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    check u have it on in bios and taht ur hardware supports it. Check your kernel boot parameters for dma=off or some such, then i would suggest checkign the man pages to see if it needs soem other program/driver to run properly.
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  3. 01-23-2004 #3
    Dolda2000
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    Did you select IDE DMA support when compiling your kernel?
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  4. 01-23-2004 #4
    variant
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    I suspected that that was the problem but I cant see the option listed. What submenu is it under?
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  5. 01-24-2004 #5
    Dolda2000
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    In 2.4 kernels, it is ATA/IDE/MFM/RLL support -> IDE, ATA and ATAPI Block devices -> IDE chipset support -> PCI IDE chipset support -> Generic PCI bus-master DMA support.
    For 2.6, it's almost the same, but you have to enter Device Drivers first.
    While you're there, try and find a specific driver for your chipset as well. It's likely to boost performance many times. For me, that made IDE transfers 20 times faster.
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  6. 01-24-2004 #6
    variant
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    hmm my exact chipset wasnt there (ALi M1535D+) but i selected the ali option anyway.. this is ok you think? Thanks for your help btw!
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  7. 01-24-2004 #7
    variant
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    ok.. i recompiled with those options.. still no luck same error as before. the disks do support dma acess as does my chipset. I had both disks working with dma under SuSE. It does not work when trying to set dma on my dvd rom drive either (hdc) same error:


    hdparm -d1 /dev/hdb

    /dev/hda:
    setting using_dma to 1 (on)
    HDIO_SET_DMA failed: Operation not permitted
    using_dma = 0 (off)
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  8. 01-24-2004 #8
    Dolda2000
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    That's kind of weird... Can you run "hdparm -i /dev/hdb" and post the output?
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  9. 01-24-2004 #9
    variant
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    Code:
    # hdparm -i /dev/hdb

/dev/hdb:

 Model=Maxtor 2B020H1, FwRev=WAK21R90, SerialNo=B1JZG7RE
 Config={ Fixed }
 RawCHS=16383/16/63, TrkSize=0, SectSize=0, ECCbytes=57
 BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=40020624
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 
 AdvancedPM=yes: disabled (255) WriteCache=enabled
 Drive conforms to: (null): 

 * signifies the current active mode
    heer is the same for hda:

    Code:
    # hdparm -i /dev/hda

/dev/hda:

 Model=MAXTOR 6L040J2, FwRev=A93.0500, SerialNo=362220421447
 Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs }
 RawCHS=16383/16/63, TrkSize=32256, SectSize=21298, ECCbytes=4
 BuffType=DualPortCache, BuffSize=1819kB, MaxMultSect=16, MultSect=off
 CurCHS=16383/16/63, CurSects=16514064, LBA=yes, LBAsects=78177792
 IORDY=on/off, tPIO={min:120,w/IORDY:120}, tDMA={min:120,rec:120}
 PIO modes:  pio0 pio1 pio2 pio3 pio4 
 DMA modes:  mdma0 mdma1 mdma2 
 UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6 
 AdvancedPM=no WriteCache=enabled
 Drive conforms to: ATA/ATAPI-5 T13 1321D revision 1: 

 * signifies the current active mode
    hmm.. when I recompiled the kernel I did:

    Code:
    cp /usr/src/linux/arch/i386/boot/bzImage /boot/bzImage
    by doing it that was does it overwrite the existing bzImage or does it make no changes? maby the destination should have been /boot/?
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  10. 01-24-2004 #10
    Dolda2000
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    It seems to be indicating that your drive already runs on UDMA. Maybe your chipset driver simply always uses DMA and doesn't allow you to change it at all.

    The `cp' command was OK.
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