Kernel 2.4.20 PCI: Device 00:0f.1 not available because of resource collisions

kernel output:

SvrWks CSB5: IDE controller on PCI bus 00 dev 79
PCI: Device 00:0f.1 not available because of resource collisions SvrWks CSB5: (ide_setup_pci_device:) Could not enable device.
hda: IC35L040AVER07-0, ATA DISK drive
ide0 at 0x1f0-0x1f7,0x3f6 on irq 14
hda: 80418240 sectors (41174 MB) w/1916KiB Cache, CHS=5005/255/63

when mount /dev/cdrom /mnt/cdrom
system died.

lspci:
00:00.0 Host bridge: ServerWorks CNB20HE Host Bridge (rev 23)
00:00.1 Host bridge: ServerWorks CNB20HE Host Bridge (rev 01) 00:00.2 Host bridge: ServerWorks: Unknown device 0006 (rev 01) 00:00.3 Host bridge: ServerWorks: Unknown device 0006 (rev 01) 00:01.0 VGA compatible controller: ATI Technologies Inc Rage XL (rev 27) 00:02.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 00:03.0 Ethernet controller: Intel Corp. 82557/8/9 [Ethernet Pro 100] (rev 08) 00:0f.0 ISA bridge: ServerWorks CSB5 South Bridge (rev 92) 00:0f.1 IDE interface: ServerWorks CSB5 IDE Controller (rev 92) 00:0f.2 USB Controller: ServerWorks OSB4/CSB5 USB Controller (rev 05) 00:0f.3 Host bridge: ServerWorks: Unknown device 0230
02:0b.0 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01) 02:0b.1 SCSI storage controller: Adaptec AIC-7899P U160/m (rev 01)

what is wrong ?