Driver loads even if Class Code in INF does not match with PCIe device.

Chirag_Chinmay · June 26, 2018, 7:10am

Hi all,

I have been encountering a problem in Windows 7.

A nvme SSD when connected to a windows 7 system having class code as zero ( 0 ). The driver for the nvme SSD has its vendor ID, Device ID and Class Code as non zero and is populated with proper values in the INF file.
Why does the driver tries to load during system bootup? If my understanding is correct if the Class Code does not match, the driver shouldn’t load.

in INF File :
PCI\VEN_10EE&DEV_6024&CC_010802

Thanks and Regards,
Chirag

Doron_Holan · June 26, 2018, 10:13am

What start type is your driver configured for? Demand (3) or boot (0) perhaps?

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Subject: [ntdev] Driver loads even if Class Code in INF does not match with PCIe device.

Hi all,

I have been encountering a problem in Windows 7.

A nvme SSD when connected to a windows 7 system having class code as zero ( 0 ). The driver for the nvme SSD has its vendor ID, Device ID and Class Code as non zero and is populated with proper values in the INF file.
Why does the driver tries to load during system bootup? If my understanding is correct if the Class Code does not match, the driver shouldn’t load.

in INF File :
PCI\VEN_10EE&DEV_6024&CC_010802

Thanks and Regards,
Chirag

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Chirag_Chinmay · June 26, 2018, 11:06pm

Hello Doron,

My driver is configured for boot start type.

Thanks,
Chirag

Doron_Holan · June 26, 2018, 11:23pm

Boot start drivers are always loaded at boot regardless of if they match a pnp device. Later OS versions will optimize this and if a boot start driver loads and doesn?t match on a pnp device it will not load on subsequent boots.

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