On Jan 31, 2007, at 7:45 AM, Klaus Klein wrote:
Frank Wille wrote:- Why is battable an array with 512 entries? 16 should be enough.That's because the MPC601 can translate only up to 8M per BAT, as opposed other, less limited OEA implementations, an thus needs that many entries. (You can check dsi601trap; it differs, among other details, in the amount of fault address -> battable entry# shifting.)
I've been thinking that using 8M for the normal OEA would be a good idea as well. You could still use a 256M/128M/64M/32M/16M as well as 8M, you'd just fill in 32/16/8/4/2 entries with the large entry but it would allows finer resolution of the BATs.