Peter Stuge wrote:
On Tue, Aug 14, 2007 at 03:07:49PM +0700, Darmawan Salihun wrote:
Moreover, direct port I/O was working flawlessly with the older flashrom that I port to windows back then. I think the "DPC" trick will guarantee the atomic operation and will give us the level of confidence to do the direct port I/O.
I am not at all confident about that.
Roman did make a good point about IRQL but that does not eliminate the problem, we will still be changing hardware state underneath the OS and that is ALWAYS a bad idea.
Please look into:
http://www.hollistech.com/Resources/Misc%20articles/getbusdata.htm http://www.freelists.org/archives/wdmaudiodev/03-2004/msg00010.html
for Windows 2000 and newer.
I do think we should try to support NT 4 as well, and there the Hal API is good, so please don't throw the code away yet.
No, I'm not. I put the code into my own local repository for future experimentation. Anyway, I've read both of the articles you mentioned. I will try looking into the issue much further tonight. I may missed something ;-).
The problem is HalSetBusDataByOffset is not working as documented in MSDN :-(.
--Darmawan