Forum Discussion
Altera_Forum
Honored Contributor
Honored Contributorcacheable PCIe BAR
Is it possible to make BAR cacheable for PCIe hard macro on Stratix IV attached to standard PC with Intel processor? Anything special needs to be done in the driver for such case? Thanks!
Altera_ForumHonored Contributor
Honored Contributor --- Quote Start --- I know about DMA and that it would be more efficient. However, in this case the goal is different - neither efficiency, no consistency are the issues. --- Quote End --- Ok. --- Quote Start --- I think it might be a HW issue ... Mmapping /dev/mem at PCIe BAR address was also tried with the same result: reads work as expected, writes cause system reboot. --- Quote End --- In this thread http://www.alteraforum.com/forum/showthread.php?t=35678 there is a zip file containing a program called pci_debug. Could you try that. I've used it on the Cyclone IV GX kit, the Stratix IV GX kit, and the DE4, and it works fine on all of them. If you find writes causing your system to crash still, then it definitely sounds like a hardware issue. Cheers, Dave
