[wdmaudiodev] Writing to PCI configuration space???
- From: "Nitin Porwal, Noida" <nitinp@xxxxxxxxxxxxxxxxx>
- To: "'wdmaudiodev@xxxxxxxxxxxxx '" <wdmaudiodev@xxxxxxxxxxxxx>
- Date: Mon, 1 Mar 2004 09:34:21 +0530
Hi,
I am writing a driver for PCI based device. I am having some problem
writing PCI configuration space. I have to write 0x0006 to Command register
of PCI config space. but when i read back the written values it shows
0x0002. Does anybody have any idea why this happens.
There is also a strange thing happening to me, when i reboot the system
the PCI config space's command register value comes as 0x0002 (before
writing to it), but when i load the driver through device manager i get the
value 0x0. when i write 0x0006 to command register and read it back, i get
0x0002 every time.
I am using PCI_COMMON_CONFIG structure to write to PCI config space, i
just create an IRP packet and pass it to low level driver i.e. bus driver.
To read it i use IRP_MN_READ and to write i use IRP_MN_WRITE minor
functions.
If anybody have any idea about it please revert back to me.
Thanks
Nitin
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