Il giorno Thu, 11 Jul 2002, Brian Fahrlander cos� ha scritto:
|From: Brian Fahrlander <[EMAIL PROTECTED]>
|To: [EMAIL PROTECTED]
|Date: Thu, 11 Jul 2002 05:38:10 -0500
|Subject: Re: AW: [Ltsp-discuss] Help! Needing Kernel with DMA Support
|
|On Thu, 11 Jul 2002 12:32:40 +0200, "Alain Vaslet" <[EMAIL PROTECTED]> wrote:
|
|> AFAIK, it has to be compiled in kernel. I'm using hdparm (-d1 /dev/hda)
|> to enable DMA support on my hard disk drive. It says this:
|>
|> HDIO_SET_DMA failed: Operation not permitted
|>
|> I searched the web for this and every time it was due to missing
|> DMA-support in the kernel.
|
| That's odd; I'm on a stock kernel; it works here. You *are* trying this as root,
|right? It might be a stupid question, but I have to ask...
|
It could be that the drive in use is in the kernel's black list of those
drives that are unreliable when you turn on their DMA capabilities. In the
kernel sources' tree you have the list of these drives in the
drivers/ide/ide-dma.c file. This file, in the 2.4.18 kernel, has this list:
struct drive_list_entry drive_blacklist [] = {
{ "WDC AC11000H" , "ALL" },
{ "WDC AC22100H" , "ALL" },
{ "WDC AC32500H" , "ALL" },
{ "WDC AC33100H" , "ALL" },
{ "WDC AC31600H" , "ALL" },
{ "WDC AC32100H" , "24.09P07" },
{ "WDC AC23200L" , "21.10N21" },
{ "Compaq CRD-8241B" , "ALL" },
{ "CRD-8400B" , "ALL" },
{ "CRD-8480B", "ALL" },
{ "CRD-8480C", "ALL" },
{ "CRD-8482B", "ALL" },
{ "CRD-84" , "ALL" },
{ "SanDisk SDP3B" , "ALL" },
{ "SanDisk SDP3B-64" , "ALL" },
{ "SANYO CD-ROM CRD" , "ALL" },
{ "HITACHI CDR-8" , "ALL" },
{ "HITACHI CDR-8335" , "ALL" },
{ "HITACHI CDR-8435" , "ALL" },
{ "Toshiba CD-ROM XM-6202B" , "ALL" },
{ "CD-532E-A" , "ALL" },
{ "E-IDE CD-ROM CR-840", "ALL" },
{ "CD-ROM Drive/F5A", "ALL" },
{ "RICOH CD-R/RW MP7083A", "ALL" },
{ "WPI CDD-820", "ALL" },
{ "SAMSUNG CD-ROM SC-148C", "ALL" },
{ "SAMSUNG CD-ROM SC-148F", "ALL" },
{ "SAMSUNG CD-ROM SC", "ALL" },
{ "SanDisk SDP3B-64" , "ALL" },
{ "SAMSUNG CD-ROM SN-124", "ALL" },
{ "PLEXTOR CD-R PX-W8432T", "ALL" },
{ "ATAPI CD-ROM DRIVE 40X MAXIMUM", "ALL" },
{ "_NEC DV5800A", "ALL" },
{ 0 , 0 }
};
Some are bugged just in some particular revision of their firmware, others
are just mulfunctioning whith DMA on.
What drive are you using?
Sandro
--
Bellum se ipsum alet.
La guerra nutre se stessa.
Livio, "Ab urbe condita", XXXIV,9
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