Sorry, most devices were reinstalled at each boot, as the calculated crc32 for the parent was changing.
Prevent this by using only the parent InstancePath instead of the whole DEVICE_NODE structure

Modified: trunk/reactos/ntoskrnl/io/pnpmgr.c

--- trunk/reactos/ntoskrnl/io/pnpmgr.c	2005-10-16 11:17:26 UTC (rev 18496)
+++ trunk/reactos/ntoskrnl/io/pnpmgr.c	2005-10-16 14:10:29 UTC (rev 18497)
@@ -1415,8 +1415,8 @@

       goto cleanup;
 
    /* 2. Create the ParentIdPrefix value */

-   currentByte = (PBYTE)DeviceNode->Parent;
-   for (i = 0; i < sizeof(DEVICE_NODE); i++, currentByte++)

+   currentByte = (PBYTE)DeviceNode->Parent->InstancePath.Buffer;
+   for (i = 0; i < DeviceNode->Parent->InstancePath.Length; i++, currentByte++)

       crc32 = (crc32 >> 8) ^ crc32Table[*currentByte ^ (crc32 & 0xff)];
    crc32 = ~crc32;
    KeyValue.Buffer = (PWSTR)ParentIdPrefixInformation->Data;