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SubjectPIIX4 IDE w/ MWDMA disk still broken in 2.4.20-rc1(bk)
Since the EXTRAVERSION is -rc1 already in BK, I did try 2.4.20-current
again - just to see that mwdma disk with piix4 is still broken as in
2.4.19. I will continue using 2.4.18 but here are the details again.

I have 3 hard disks an 1 cdrom. 2 quantums in udma mode on first
channel, toshiba cdrom and 2.5G mwdma seagate on second channel:

PIIX4: IDE controller on PCI bus 00 dev 39
PIIX4: chipset revision 1
PIIX4: not 100%% native mode: will probe irqs later
ide0: BM-DMA at 0xf000-0xf007, BIOS settings: hda:pio, hdb:pio
ide1: BM-DMA at 0xf008-0xf00f, BIOS settings: hdc:pio, hdd:pio
hda: QUANTUM FIREBALL ST1.6A, ATA DISK drive
hdb: QUANTUM FIREBALL ST1.6A, ATA DISK drive
hdc: TOSHIBA CD-ROM XM-6002B, ATAPI CD/DVD-ROM drive
hdd: ST32531A, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
ide1 at 0x170-0x177,0x376 on irq 15
blk: queue c02cdfa4, I/O limit 4095Mb (mask 0xffffffff)
hda: 3153024 sectors (1614 MB) w/81KiB Cache, CHS=782/64/63, UDMA(33)
blk: queue c02ce0f0, I/O limit 4095Mb (mask 0xffffffff)
hdb: 3153024 sectors (1614 MB) w/81KiB Cache, CHS=782/64/63, UDMA(33)
blk: queue c02ce454, I/O limit 4095Mb (mask 0xffffffff)
hdd: 4996476 sectors (2558 MB), CHS=4956/16/63, DMA

hdd is the problematic one. When I put any heavy disk load on it, the
computer just hangs in 2.4.19 and later. It is OK in 2.4.18 and below.
The drive is using mwdma2 mode (hdparm -i from 2.4.18):

Model=ST32531A, FwRev=0.62, SerialNo=VE047143
Config={ HardSect NotMFM HdSw>15uSec Fixed DTR>10Mbs RotSpdTol>.5% }
RawCHS=4956/16/63, TrkSize=0, SectSize=0, ECCbytes=4
BuffType=unknown, BuffSize=0kB, MaxMultSect=16, MultSect=16
CurCHS=4956/16/63, CurSects=4996476, LBA=yes, LBAsects=4996476
IORDY=on/off, tPIO={min:383,w/IORDY:120}, tDMA={min:120,rec:120}
PIO modes: pio0 pio1 pio3 pio4
DMA modes: mdma0 mdma1 *mdma2
AdvancedPM=no

PIIX chipset support and tuning is on, as it has been for a long time
since BIOS programs very slow non-udma dma modes.

--
Meelis Roos e-mail: mroos@ut.ee
www: http://www.cs.ut.ee/~mroos/

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