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SubjectHow to add a drive to DMA black list?
Hello all,

I have an ide hard drive that misbehaves when the option "enable DMA at
boot time" (2.4.x kernel) is selected (this is on a on board ide
controller). But on the other hand I have a Promise Ultra-ATA-100
controller with an IBM ATA-100 drive that, according to the menuconfig
information and the information at the top of the driver requires the
"enable DMA at boot time" feature to be selected.

I tried adding the string that is output for the bad drive by hdparm -i
into drivers/ide/ide-dma.c::drive_blacklist and
drivers/ide/ide-dma.c::bad_dma_drives but the kernel still says that it is
using DMA and the kernel hangs after displaying:

PIIX: chipset revision 2
PIIX: not 100% native mode: will probe irqs later
PDC20267: IDE controller on PCI bus 00 dev 98
PDC20267: chipset revision 2
PDC20267: not 100% native mode: will probe irqs later
PDC20267: (U)DMA Burst Bit ENABLED Primary PCI Mode Secondary PCI Mode.
hdc: Conner Peripherals 1275MB - CFS1275A, ATA DISK drive
hde: IBM-DTLA-307045, ATA DISK drive
hdc: 2496876 sectors (1278 MB) w/64KiB Cache, CHS=2477/16/63, DMA
hde: 90069840 sectors (46116 MB) w/1916KiB Cache, CHS=89355/16/63. UDMA(100)
Partition check:
hda: hda1 hda2 < hda5 >
hdc:hdc: timout waiting for DMA
ide_dmaproc: chipset supported ide_dma_timeout func only: 14
hdc: irq timeout: status=0x58 { DriveReady SeekComplete DataRequest }

What should I do? Thanks in advance,


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