On 06/27/2013 08:36:37 PM, Kevin Hao wrote:

On Thu, Jun 27, 2013 at 02:58:34PM -0500, Scott Wood wrote:

quoted

On 06/26/2013 09:00:33 PM, Kevin Hao wrote:

quoted

This is based on the codes in the head_44x.S. Since we always =20

align to

quoted

quoted

256M before mapping the PAGE_OFFSET for a relocatable kernel, we =20

also

quoted

quoted

change the init tlb map to 256M size.

Why 256M?

=20
For two reasons:
  1. This is the size which both e500v1 and e500v2 support.
  2. Since we always use the PAGE_OFFSET as 0xc0000000, the 256M is
     max alignment value we can use for this virtual address.

0xc0000000 is 1G-aligned, so I don't see why 256M is the maximum (after =20
verifying that enough memory is present with the right alignment, of =20
course).  The TLB1 savings would probably not be enough to justify =20
figuring that out, though.

-Scott=