ide0: Speed warnings UDMA 3/4/5 is not functional

niddle

安装fedora 3后，dmesg |grep ata，看到如下：
ata1: SATA max UDMA/133 cmd 0xFE00 ctl 0xFE12 bmdma 0xFEA0 irq 7
ata2: SATA max UDMA/133 cmd 0xFE20 ctl 0xFE32 bmdma 0xFEA8 irq 7

用hdparm查看硬盘参数，发现DMA模式已经打开。

编译内核2.6.10，与硬盘有关的选项配置如下；

ATA/ATAPI/MFM/RLL support  --->
        <*> ATA/ATAPI/MFM/RLL support
        <*>   Enhanced IDE/MFM/RLL disk/cdrom/tape/floppy support
        ---     Please see Documentation/ide.txt for help/info on IDE drives
        [ ]     Support for SATA (deprecated; conflicts with libata SATA driver)
        [ ]     Use old disk-only driver on primary interface
        <M>     Include IDE/ATA-2 DISK support
        [ ]       Use multi-mode by default
        < >     Include IDE/ATAPI CDROM support
        < >     Include IDE/ATAPI TAPE support (EXPERIMENTAL)
        < >     Include IDE/ATAPI FLOPPY support
        < >     SCSI emulation support
        [ ]     IDE Taskfile Access
        ---     IDE chipset support/bugfixes
        <*>     generic/default IDE chipset support
        [ ]     CMD640 chipset bugfix/support
        [ ]     PCI IDE chipset support

SCSI device support  --->
        <M> SCSI device support
        [ ]   legacy /proc/scsi/ support
        ---   SCSI support type (disk, tape, CD-ROM)
        < >   SCSI disk support
        < >   SCSI tape support
        < >   SCSI OnStream SC-x0 tape support
        < >   SCSI CDROM support
        < >   SCSI generic support
        ---   Some SCSI devices (e.g. CD jukebox) support multiple LUNs
        [ ]   Probe all LUNs on each SCSI device
        [ ]   Verbose SCSI error reporting (kernel size +=12K)
        [ ]   SCSI logging facility
              SCSI Transport Attributes  --->
              SCSI low-level drivers  --->
                        < > 3ware 5/6/7/8xxx ATA-RAID support
                        < > 3ware 9xxx SATA-RAID support
                        < > ACARD SCSI support
                        < > Adaptec AACRAID support
                        < > Adaptec AIC7xxx Fast -> U160 support (New Driver)
                        < > Adaptec AIC7xxx support (old driver)
                        < > Adaptec AIC79xx U320 support
                        < > Adaptec I2O RAID support
                        < > AdvanSys SCSI support
                        [ ] LSI Logic New Generation RAID Device Drivers
                        < > LSI Logic Legacy MegaRAID Driver
                       

Serial ATA (SATA) support
                        < >   AHCI SATA support
                        < >   ServerWorks Frodo / Apple K2 SATA support
                        <M>   Intel PIIX/ICH SATA support
                        < >   NVIDIA SATA support
                        < >   Promise SATA TX2/TX4 support
                        < >   Promise SATA SX4 support
                        < >   Silicon Image SATA support
                        < >   SiS 964/180 SATA support
                        < >   ULi Electronics SATA support
                        < >   VIA SATA support
                        < >   VITESSE VSC-7174 SATA support
                        < > BusLogic SCSI support
                        < > DMX3191D SCSI support
                        < > EATA ISA/EISA/PCI (DPT and generic EATA/DMA-compliant boards) support

重启后，dmesg中显示：
ata1: SATA max UDMA/133 cmd 0xFE00 ctl 0xFE12 bmdma 0xFEA0 irq 18
ata2: SATA max UDMA/133 cmd 0xFE20 ctl 0xFE32 bmdma 0xFEA8 irq 18

hdparm -i /dev/hda:
显示：UDMA modes: udma0 udma1 udma2 udma3 udma4 *udma5 udma6

hdparm /dev/hda:
/dev/hda:
multcount    =  0 (off)
IO_support   =  0 (default 16-bit)
unmaskirq    =  0 (off)
using_dma    =  0 (off)
keepsettings =  0 (off)
readonly     =  0 (off)
readahead    = 256 (on)
geometry     = 65535/16/63, sectors = 80000000000, start = 0

显示DMS模式关闭。

hdparm -tT /dev/hda

/dev/hda:
Timing cached reads:   2852 MB in  2.00 seconds = 1426.22 MB/sec
Timing buffered disk reads:   10 MB in  3.26 seconds =   3.07 MB/sec

硬盘数据传输率只有3M/秒。

hdparm –d1 /dev/hda

/dev/hda:
setting using_dma to 1 (on)
HDIO_SET_DMA failed: Operation not permitted
using_dma    =  0 (off)

启动DMA模式失败。

hdparm -c3 /dev/hda

/dev/hda:
setting 32-bit IO_support flag to 3
IO_support   =  3 (32-bit w/sync)

再测试硬盘传输率：
/dev/hda:
Timing cached reads:   2720 MB in  2.00 seconds = 1360.21 MB/sec
Timing buffered disk reads:   16 MB in  3.36 seconds =   4.76 MB/sec，略有提高。

Hdparm -X udma5 /dev/hda

dmesg中显示：ide0: Speed warnings UDMA 3/4/5 is not functional

DMA模式问题还是没有解决。

请问如何解决这个问题？