G
gerros
Sometimes some customers reports us a blue screen when they push/pull
USB mass storage device to our XPE-Systems.
After a long search i found the following reproducible situation.
The blue screens occurs only under the following situation:
1. The system has only USB 1.1 interfaces.
2. The ewf driver must be included in the image, but it is not
necessary to enable the writefilter.
3. You have to connect/reconnect a USB 2.0 Memorystick between 1 and
100 times to this system with an intervall of 1 second.
After that the sytem crashes with different blue screen e.g.
-BAD_POOL_CALLER 0xC2 (0x07,0xCD4,0x01,0x82598170)
-IRQ_NOT_LESS_OR_EQUAL ...
-STOP: 0x7E ...
-STOP: 0x8E ...
In the images there are all avaliable QFE's from the MS-OEM sites
implemented.
The bluesceen occurs on different hardware plattforms and different
usb 2.0 memorysticks, when the above 3 points are given.
The blue sceens occurs not :
1. when an identical image without ewf components is used.
2. when usb 1.1 Memorysticks is used instead of the USB 2.0
Memorysticks for the test.
3. the system has an USB 2.0 interface.
If one of the points is fulfil, the systems are running stable.
The stange behavior is the the bluescreen occurs also if ewf is
disabled, only an image without ewf components let work the system
stable.
So it seems the the EWF driver has problems together USB 2.0 mass
storage devices on USB 1.1 interfaces.
An interesting question is, what the ewf-driver is doing when it is
disabled?
Normally it sould do nothing, but it seems that is not right.
USB mass storage device to our XPE-Systems.
After a long search i found the following reproducible situation.
The blue screens occurs only under the following situation:
1. The system has only USB 1.1 interfaces.
2. The ewf driver must be included in the image, but it is not
necessary to enable the writefilter.
3. You have to connect/reconnect a USB 2.0 Memorystick between 1 and
100 times to this system with an intervall of 1 second.
After that the sytem crashes with different blue screen e.g.
-BAD_POOL_CALLER 0xC2 (0x07,0xCD4,0x01,0x82598170)
-IRQ_NOT_LESS_OR_EQUAL ...
-STOP: 0x7E ...
-STOP: 0x8E ...
In the images there are all avaliable QFE's from the MS-OEM sites
implemented.
The bluesceen occurs on different hardware plattforms and different
usb 2.0 memorysticks, when the above 3 points are given.
The blue sceens occurs not :
1. when an identical image without ewf components is used.
2. when usb 1.1 Memorysticks is used instead of the USB 2.0
Memorysticks for the test.
3. the system has an USB 2.0 interface.
If one of the points is fulfil, the systems are running stable.
The stange behavior is the the bluescreen occurs also if ewf is
disabled, only an image without ewf components let work the system
stable.
So it seems the the EWF driver has problems together USB 2.0 mass
storage devices on USB 1.1 interfaces.
An interesting question is, what the ewf-driver is doing when it is
disabled?
Normally it sould do nothing, but it seems that is not right.