On Thu, 2006-02-23 at 19:51 +0800, erich wrote: > If Linux can not assurent the contingous memory space allocating of > "dma_alloc_coherent" . coherent memory is guaranteed to be in the "lower" 32 bit of memory! So that is good news, I think you are just fine. [Exception is that you can say that you are ok with a bigger mask for this type of memory, but just don't do that if you're not] > When arcmsr get a physical ccb address from areca's firmware. > Does linux has any functions for converting of "bus to virtual" ? not without using pools. You would have to search the list of memory you gave it to find that out. (USB has a similar problem, afaik they solved it with pools) - : send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html