Messages in this thread | | | Date | Thu, 21 Jan 1999 23:04:29 -0600 (CST) | From | "Andre M. Hedrick" <> | Subject | Re: Are WDC AC33100H & AC31600H DMA-safe? |
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Greetings fellow astronomer,
www.wdc.com/quality/err-rec.html
There are firmware releases that do not handle UDMA correctly.
Until a better test can be composed that tests against model and firmware, safety first is the rules of the game.
If your drive functions okay, then edit the ./drivers/block/ide-dma.c file.
On Thu, 21 Jan 1999, David Whysong wrote:
> On Thu, 21 Jan 1999, Koby Kahane wrote: > > >I have recently upgraded from 2.0.36 to 2.2.0-pre9 > > > >I've noticed that my boot messages say that DMA is disabled for my > >2nd and 3rd hard disks. Is it safe for me to enable DMA (via hdparm) > >for these drive models or should I stick to none-DMA mode? > > I don't know about the AC33100H, but my AC31600H has worked perfectly with > DMA for about 3 years. I don't know why it has been blacklisted... > > [root@Sleepy dwhysong]# grep '/dev/hdb' /etc/rc.d/rc.local > hdparm -m16 -u1 -c1 -d1 /dev/hdb > > [root@Sleepy dwhysong]# hdparm -i /dev/hdb > > /dev/hdb: > > Model=WDC AC31600H, FwRev=23.16U73, SerialNo=WD-WT289 > Config={ HardSect NotMFM HdSw>15uSec SpinMotCtl Fixed DTR>5Mbs FmtGapReq } > RawCHS=3148/16/63, TrkSize=57600, SectSize=600, ECCbytes=22 > BuffType=3(DualPortCache), BuffSize=128kB, MaxMultSect=16, MultSect=16 > DblWordIO=no, maxPIO=2(fast), DMA=yes, maxDMA=0(slow) > (maybe): CurCHS=787/64/63, CurSects=3173184, LBA=yes, LBAsects=3173184 > tDMA={min:120,rec:120}, DMA modes: mword0 mword1 *mword2 > IORDY=on/off, tPIO={min:160,w/IORDY:120}, PIO modes: mode3 mode4 > > [root@Sleepy dwhysong]# hdparm /dev/hdb > > /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 = 787/64/63, sectors = 3173184, start = 0 > > > Dave > > David Whysong dwhysong@physics.ucsb.edu > Astrophysics graduate student University of California, Santa Barbara > PGP public keys available at http://www.physics.ucsb.edu/~dwhysong/pgpkey.asc > DSS PGP Key 0x903F5BD6 : FE78 91FE 4508 106F 7C88 1706 B792 6995 903F 5BD6 > D-H PGP key 0x5DAB0F91 : BC33 0F36 FCCD E72C 441F 663A 72ED 7FB7 5DAB 0F91 > > > - > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to majordomo@vger.rutgers.edu > Please read the FAQ at http://www.tux.org/lkml/ >
Cheers, Andre Hedrick The (NEW) Linux IDE guy The APC UPS Specialist for Linux
http://www.dyer.vanderbilt.edu/server/udma/ http://www.dyer.vanderbilt.edu/server/apcupsd/apcupsd-3.5.2.bin.tar.gz
You just need a bigger hammer, or learn how to swing the one you have better. (C) me.....
- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/
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