Hello, Da Zheng, le Thu 22 Apr 2010 22:37:51 +0800, a écrit : > So does the driver need to consider about cache coherency problems on PC when > interacting with the external device?
Yes (since you can not rely on the BIOS), you need to remap the mmio range with cache disabled: INTEL_PTE_NCACHE|INTEL_PTE_WTHRU. This should already be done by pmap_enter(). Samuel
