Matthew Jacob wrote: > Neither is really applicable here. The actual limits for alpha depend on the > platforma and how you implement it. Typically, the bigger alphas have been > implemented with a 2GB direct mapped window, and then, if they have it, a S/G > map setup for the rest (if any) of memory, which also can include ISA mapping.
Thanks for the clarification. I was confusing BUS_SPACE_MAXSIZE with BUS_SPACE_MAXSIZE_24BIT and BUS_SPACE_MAXSIZE_32BIT. It's probably too late to rename BUS_SPACE_MAXSIZE to something like BUS_SPACE_MAXXFER. 8-(. > The current Alpha 2.4.18 Linux implementation is quite happy to DMA to > 4GB > on quite a few alphas. Ah. Reference code. > BUS_SPACE_MAXSIZE seems to be related to the 'largest xfer you will be allowed > to do at one time'- which is wrong because MAXPHYS is larger. Yeah, I get that now. No need to beat me up, I can take care of it myself. 8-) 8-). -- Terry To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-current" in the body of the message
