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Description of problem:
When I try to execute 'hdparm -d1 /dev/hda' I get error saying that it is not
possible to enable DMA on that disk.
After checking /var/log/dmesg I discovered that the problem is that kernel
doesn't recognize my IDE controller.
I have Intel D845GRG motherboard.
Version-Release number of selected component (if applicable):
Steps to Reproduce:
1.Install RedHat Linux 7.3 on Intel D845GRG based computer.
2.Try to execute 'hdparm -d1 /dev/hda'
3.Take a look at /var/log/dmesg
Actual Results: using DMA=0
Expected Results: using DMA=1
Created attachment 74604 [details]
A patch for IDE in Intel 845E chipset
I want something stable for my new MB with Intel 845E chipset.
I am testing this patch against kernel 2.4.18-10. It seems to
work ok for me. I copied several GB data onto the IDE HD. I got
PCI: Probing PCI hardware (bus 00)
PCI: IDE base address fixup for 00:1f.1
Assigned region 0: I/O ports: 0x1f0-0x1f7
Assigned region 1: I/O ports: 0x3f6-0x3f6
Assigned region 2: I/O ports: 0x170-0x177
Assigned region 3: I/O ports: 0x376-0x376
ide: Assuming 33MHz system bus speed for PIO modes; override with idebus=xx
PIIX4: IDE controller on PCI bus 00 dev f9
PIIX4: chipset revision 1
PIIX4: not 100% native mode: will probe irqs later
ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:DMA, hdb:pio
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:DMA, hdd:pio
hda: LITE-ON LTR-48125W, ATAPI CD/DVD-ROM drive
hdc: Maxtor 96147H6, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
The kernel in rawhide 2.4.18-12.5 seems to already have an similar patch.
2.4.18-12.5 fixes the dma problem for the 845 chipsets afaict.
2.4.18-12.5 is ok, but not good enough:
# cat /proc/ioports
0170-0000 : Intel Corp. 82801CAM IDE U100
0170-0177 : ide1
01f0-0000 : Intel Corp. 82801CAM IDE U100
01f0-01f7 : ide0
0374-0000 : Intel Corp. 82801CAM IDE U100
0376-0376 : ide1
1860-186f : Intel Corp. 82801CAM IDE U100
1860-1867 : ide0
1868-186f : ide1
It doesn't make much senses. Also I got
00:1f.1 IDE interface: Intel Corp. 82801CAM IDE U100 (rev 02) (prog-if 8a
[Master SecP PriP])
Subsystem: Sony Corporation: Unknown device 80fa
Flags: bus master, medium devsel, latency 0, IRQ 255
I/O ports at 01f0
I/O ports at 03f4
I/O ports at 0170
I/O ports at 0374
I/O ports at 1860 [size=16]
Memory at e8000000 (32-bit, non-prefetchable) [size=1K]
I don't like it at all. I will upload a patch. It seems to work
for me. But I don't know if it is 100% correct.
Created attachment 75464 [details]
A patch to fix up the IDE I/O ports.
It would be great if these changes could make it into an official Red Hat kernel errata release, since most of the new Compaq and Dell desktop
PC's that are shipping now have the Intel845 chipset...and without these fixes the machines are basically useless for Linux.
fixed in current errata