Update the ATAPI Driver Legacy Registry Setting (Compact 7)
3/12/2014
The ATAPI driver in Windows Embedded Compact 7 replaces the registry subkey HKLM\Drivers\BuiltIn\PCI\Template\<Controller Key Name>\Legacy with the subkey LegacyIRQ. You must replace any occurrence of Legacy in the registry with LegacyIRQ.
If LegacyIRQ is equal to IRQ (IRQ 14 for CEPC), the value of the secondary channel IRQ will be the primary IRQ plus 1 (IRQ 15 for CEPC). If LegacyIRQ is absent or equal to -1 (0xffffffff), the driver will assume it is not using the legacy IRQ and both channels will use the same IRQ (IRQ sharing).