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System Implementation
1-21
PCI445X Device
2) Register save/restore
Register content is not preserved in the sleeping state (it depends on the
system implementation). Therefore, BIOS should restore the register
content. Under Windows98, most of the register content is saved and
restored by the pci.vxd and cbss.vxd.
3) Troubleshooting tips for sleep/resume issues
Symptoms of sleep/resume issues are:
J System hung up during resume
J PC Card does not work after resume
J PC Card is not recognized after resume
The probable reason for these problems is that the register content is not
preserved correctly. Checking the register content before taking the system to
the sleep mode and after resuming from the sleep mode may shed some light.
If some of the register settings are not the same after resuming from the sleep
mode, then the BIOS most likely did not restore those values.
1.4.3 Docking System Consideration
Subsystem IDs can be assigned as long as the SUBSYSRW bit (system
control register, PCI offset 80h, bit 5) is set. It is better to do this from EEPROM
as no driver will be running to set the SSID up after a hot-dock/warm-dock.
Therefore, the IDs should be loaded through the I
2
C interface using an
EEPROM.