Windows System Software -- Consulting, Training, Development -- Unique Expertise, Guaranteed Results

Home NTDEV

More Info on Driver Writing and Debugging


The free OSR Learning Library has more than 50 articles on a wide variety of topics about writing and debugging device drivers and Minifilters. From introductory level to advanced. All the articles have been recently reviewed and updated, and are written using the clear and definitive style you've come to expect from OSR over the years.


Check out The OSR Learning Library at: https://www.osr.com/osr-learning-library/


Before Posting...

Please check out the Community Guidelines in the Announcements and Administration Category.

Re: Can read PCI config space, but not normal space -on one motherboard?

OSR_Community_UserOSR_Community_User Member Posts: 110,217
> When the PCI function is first scanned it presents to the BIOS the
> size of the range of memory it offers to be addressed from the PCI
> side (as oppossed to the local side). In English, it means how much
> memory it requests to be visible by the main CPU. The pnp BIOS
> replaces this value by the base address which you are trying to
> read.

Good point. Now I see where you were going...

> I would like to check that the BAR shows a real base address and not
> the initial range request value. It is the BIOS task to replace RR
> with the Base Address.

Yes, it shows a real base address that seems reasonable, for example,
0xF4000000.

Good suggestion, though.
Sign In or Register to comment.

Howdy, Stranger!

It looks like you're new here. Sign in or register to get started.

Upcoming OSR Seminars
OSR has suspended in-person seminars due to the Covid-19 outbreak. But, don't miss your training! Attend via the internet instead!
Writing WDF Drivers 24 January 2022 Live, Online
Internals & Software Drivers 7 February 2022 Live, Online
Kernel Debugging 21 March 2022 Live, Online
Developing Minifilters 23 May 2022 Live, Online