On Tue, Oct 17, 2000 at 12:05:40PM +0200, Francesc Oller wrote:
> I'm trying to use UDMA66 in my computer but haven't suceeded
> until now.
> /dev/hda:
...
> UDMA modes: mode0 mode1 mode2 mode3 *mode4
Should work
> I use Debian GNU/Linux 2.2, kernel 2.2.17-ide with Andre Hedrick's IDE
> patches applied.
Stupid Question: Did you try without the patch first? I experianced
the problem that I could set my HD to UDMA66 with no patch applied but
only to UDMA33 with the patch.
So if patching the kernel is not necessary I wouldn't recommend to do it.
> ide0: BM-DMA at 0xe000-0xe007, BIOS settings: hda:DMA, hdb:DMA
> ide0: VIA Bus-Master (U)DMA Timing Config Success
> ide1: BM-DMA at 0xe008-0xe00f, BIOS settings: hdc:DMA, hdd:DMA
> ide1: VIA Bus-Master (U)DMA Timing Config Success
OK, DMA is enabled by BIOS.
> In this preconfigured kernel CONFIG_IDEDMA_AUTO is disabled so
> DMA is disabled at boot time.
Then why didn't you change it?
> I've a secondary HD which is an old IDE drive. hdparm -iI /dev/hdb says:
>
> /dev/hdb:
>
> Model=ST1144AT, FwRev=rev 5.50, SerialNo=00KA8945150000000000
> Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>5Mbs RotSpdTol>.5% }
> RawCHS=1001/15/17, TrkSize=9792, SectSize=576, ECCbytes=7
> BuffType=3(DualPortCache), BuffSize=16kB, MaxMultSect=0
> DblWordIO=yes, OldPIO=0, DMA=yes, OldDMA=0
> (maybe): CurCHS=0/0/0, CurSects=0, LBA=yes, LBAsects=0
You got this drive at the same Controller? Of course it slows down and
causes problems.
> Questions:
>
> 1.- If I execute hdparm -d1 -X34 (DMA mode 2), the kernel starts
> panicking
> and halts. Why? (after that, I haven't even tried -X68 (UDMA66))
See above
> 2.- How come the kernel recognizes 'VT 82C597 Apollo VP3' instead of the
> more
> logical 'VT 82C598 Apollo MVP3'?
AFAIK this information is read directly from the HD so please ask your
vendor.
> 3.- I guess that since beginning with kernel 2.2, CONFIG_IDEDMA_AUTO is
> disabled by default, there must be some faulty HD/IDE controller combos
> out there when working in U/DMA mode. Whose fault is it? ST313021A works
> perfectly in UDMA33 with ALI15X3 chipset.
Sure there are soma faulty BIOSes but you are able to make your own
kernel, aren't you?
> 4.- Would you recommend to put the old IDE drive as slave? does it slow
> down the access to the ATA66 one?
It is slave right now. You should put in on a seperate controller. I
would give the UDMA-HD a controller by itself.
Phil
