Sometimes we come across the enumeration compatibility problem among OS;
A device works on Win, but it doesn't on Linux, or Mac, or vice versa.
And such a question is always answered by the rule:
  don't expect specific enumeration sequence.

Then how much are these OS different on the enumeration sequence?
Next list shows the enumeration sequence of SiLabs HID/Blinky example (vendor specific HID device),
just after device connection (host application does not run yet).
The differences are emphasized except for Get_Descriptor( string )

a) Bus reset:
  WinXP and Linux reset bus twice

b) Get_Descriptor( Device ) and Get_Descriptor( Config )
  WinXP issues these Get_Descriptor twice

c) SET_IDLE
  WinXP issues SET_IDLE after SET_CONFIGURATION

d) interrupt IN/ GET_REPORT
  WinXP and MacOSX issues IN transfer on the interrupt IN EP,
  and continues it regardless of host application.
  Linux does GET_REPORT( input ),
  and don't issue IN to the interrupt EP until host application runs.

The major difference is "interrupt IN/ GET_REPORT" just after the enumeration,
rather than the enumeration sequence itself.

GET_REPORT(input) implementation is often cut off because WinXP doesn't issue it.
But it is mandatory for USB HID spec.

Also, please note Linux doesn't issue IN request to the interrupt EP until the host app runs.
If the firmware expects that the IN EP is always hit by the host periodically, it will fail.

Tsuneo

WinXP sp2                               | Linux Kernel 2.6.19                       | MacOSX 10.4.9-10.4.10
                       value index len  |                          value index len  |                          value index len
RESET                                   | RESET                                     | RESET
GET_DESCRIPTOR  DEVICE  0100 0000  64   | GET_DESCRIPTOR    DEVICE  0100 0000  64   | GET_DESCRIPTOR    DEVICE  0100 0000   8
RESET                                   | RESET                                     |
SET_ADDRESS             0002 0000   0   | SET_ADDRESS               0003 0000   0   | SET_ADDRESS               0003 0000   0
GET_DESCRIPTOR  DEVICE  0100 0000  18   | GET_DESCRIPTOR    DEVICE  0100 0000  18   | GET_DESCRIPTOR    DEVICE  0100 0000  18
                                        |                                           | GET_DESCRIPTOR    STRING  0302 0409   2
                                        |                                           | GET_DESCRIPTOR    STRING  0302 0409  10
                                        |                                           | GET_DESCRIPTOR    STRING  0301 0409   2
                                        |                                           | GET_DESCRIPTOR    STRING  0301 0409  10
GET_DESCRIPTOR  CONFIG  0200 0000   9   | GET_DESCRIPTOR    CONFIG  0200 0000   9   | GET_DESCRIPTOR    CONFIG  0200 0000   4
GET_DESCRIPTOR  CONFIG  0200 0000 255   | GET_DESCRIPTOR    CONFIG  0200 0000  34   | GET_DESCRIPTOR    CONFIG  0200 0000  34
GET_DESCRIPTOR  STRING  0300 0000 255   | GET_DESCRIPTOR    STRING  0300 0000 255   |
GET_DESCRIPTOR  STRING  0302 0409 255   | GET_DESCRIPTOR    STRING  0302 0409 255   |
GET_DESCRIPTOR  STRING  0300 0000 255   | GET_DESCRIPTOR    STRING  0301 0409 255   |
GET_DESCRIPTOR  STRING  0302 0409 255   |                                           |
GET_DESCRIPTOR  DEVICE  0100 0000  18   |                                           |
GET_DESCRIPTOR  CONFIG  0200 0000   9   |                                           |
GET_DESCRIPTOR  CONFIG  0200 0000  34   |                                           |
SET_CONFIGURATION       0001 0000   0   | SET_CONFIGURATION         0001 0000   0   | SET_CONFIGURATION         0001 0000   0
SET_IDLE                0000 0000   0   |                                           |
GET_DESCRIPTOR  HID REP 2200 0000 147   | GET_DESCRIPTOR    HID REP 2200 0000  83   | GET_DESCRIPTOR    HID REP 2200 0000  83
                                        |                                           | GET_DESCRIPTOR    STRING  0301 0409   2
                                        |                                           | GET_DESCRIPTOR    STRING  0301 0409  10
                                        |                                           | GET_DESCRIPTOR    STRING  0302 0409   2
                                        |                                           | GET_DESCRIPTOR    STRING  0302 0409  10
IN  EP=81                               | GET_REPORT                0104 0000   2   | IN  EP=81
IN  EP=81                               | GET_REPORT                0105 0000   3   | IN  EP=81
SOF IN/NAK                              | SOF                                       | SOF IN/NAK