I build new devel kernel's version 2.6.26rc8, and UDMA100 will work
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root@tpx40:/usr/src# uname -a
Linux tpx40 2.6.26-rc8 #1 SMP Mon Jun 30 00:12:32 MSD 2008 i686 GNU/Linux
root@tpx40:/usr/src#
root@tpx40:/usr/src# dmesg | grep ata
[ 0.000000] BIOS-e820: 000000002f6e0000 - 000000002f6f7000 (ACPI data)
[ 0.000000] PERCPU: Allocating 39592 bytes of per cpu data
[ 0.004000] Memory: 758752k/777088k available (2152k kernel code, 17764k reserved, 761k data, 360k init, 0k highmem)
[ 0.004000] .data : 0xc031a2ff - 0xc03d8900 ( 761 kB)
[ 0.337429] ACPI: EC: GPE = 0x1c, I/O: command/status = 0x66, data = 0x62
[ 1.851953] libata version 3.00 loaded.
[ 3.405125] ata_piix 0000:00:1f.1: version 2.12
[ 3.405136] ata_piix 0000:00:1f.1: enabling device (0005 -> 0007)
[ 3.405575] scsi0 : ata_piix
[ 3.406125] scsi1 : ata_piix
[ 3.407478] ata1: PATA max UDMA/100 cmd 0x1f0 ctl 0x3f6 bmdma 0x1810 irq 14
[ 3.407524] ata2: PATA max UDMA/100 cmd 0x170 ctl 0x376 bmdma 0x1818 irq 15
[ 3.576287] ata1.00: ATA-0: SILICON POWER, 20070831, max UDMA/133
[ 3.576338] ata1.00: 15662304 sectors, multi 0: LBA
[ 3.576392] ata1.00: FORCE: xfer_mask set to udma100
[ 3.592226] ata1.00: configured for UDMA/100
[ 3.600229] ata1.00: FORCE: xfer_mask set to udma100
[ 3.616257] ata1.00: configured for UDMA/100
[ 3.616299] ata1: EH complete
[ 4.503453] ReiserFS: sda2: using ordered data mode
root@tpx40:/usr/src# hdparm -tT /dev/sda
/dev/sda:
Timing cached reads: 1288 MB in 2.00 seconds = 643.81 MB/sec
Timing buffered disk reads: 136 MB in 3.01 seconds = 45.21 MB/sec





