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Serial port and intermediate drivers

OSR_Community_UserOSR_Community_User Member Posts: 110,217
Hi,
can someone tell me if the DMA operation is possible on serial port with
driver that is
not allocating low-level driver for serial port (IoGetObjectPointer,
AtachDeviceObject)
and is not sending IRP's down the chain?
where can I get appropriate example of that driver?

Regards,
Neno
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