Additional data/instruction BATs not initialized for MPC8280?

Eugene Surovegin ebs at
Wed Jan 26 06:10:47 EST 2005

On Tue, Jan 25, 2005 at 09:49:13AM -0800, annamaya wrote:
> I have read in the specs for the MPC8280 that it has a
> G2_LE core which has 4 additional data and instruction
> BATs. However, I dont see these BATS being cleared
> early in the kernel. I only see that the first 4 pairs
> are cleared using the mtspr instructions. But my
> kernel comes up just fine and everything seems to work
> OK. Dont we need to clear the other set of I/DBATS?
> What happens when we dont do this? Thanks in advance.

Additional BATs in G2_LE core must be explicitly enabled in HID2 (HBE 
bit), until then they "don't exist" :).


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