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Old 08-10-02, 04:11 AM   #1
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Location: Central Louisiana
Posts: 323
Default UDMA5 Drive, But Can't Enable Past UDMA2

I'm trying to configure my Western Digital 40 GB ATA100 drive to use UDMA5, but I can't get it there. I've tried using hdparm -X69 /dev/hdb, but when I run hdparm -i /dev/hdb, it stills shows UDMA2.

I'm using RedHat 7.2.

uname -mpsr:
Linux 2.4.7-10 i686 unknown

output of hdparm -vi /dev/hdb

multcount = 16 (on)
I/O support = 1 (32-bit)
unmaskirq = 1 (on)
using_dma = 1 (on)
keepsettings = 0 (off)
nowerr = 0 (off)
readonly = 0 (off)
readahead = 8 (on)
geometry = 4865/255/63, sectors = 78165360, start = 0

Model=WDC WD400BB-00CLB0, FwRev=05.04E05, SerialNo=WD-WMAAN1125804
Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq }
RawCHS=16383/16/63, TrkSize=57600, SectSize=600, ECCbytes=40
BuffType=DualPortCache, BuffSize=2048kB, MaxMultSect=16, MultSect=16
CurCHS=16383/16/63, CurSects=-66060037, LBA=yes, LBAsects=78165360
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 udma0 udma1 *udma2 udma3 udma4 udma5
Drive Supports : Reserved : ATA-1 ATA-2 ATA-3 ATA-4 ATA-5

Do I need to compile the kernel with support for VIA hardware at this point?

NorthBridge: VIA VT8363
SouthBridge: VIA VT82C686B


Last edited by Phyre; 08-10-02 at 04:13 AM.
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Old 08-11-02, 04:49 AM   #2
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Location: Central Louisiana
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I found the answer to the problem. I'm working on getting this fix implemented. It seems that there is a problem with the IDE driver for RedHat. It forces the OS to see a 40-pin connector regardless. Therefore, the hard drive gets stuck in ATA33 mode.

Here's the solution.


The solution I used was found in: 15. Red Hat Linux 7.2/7. 1 Enabling IDE Driver Beyond ATA/33

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