[PATCH 04/14] bus: mvebu-mbus: Add static window allocation to the DT binding

Jason Gunthorpe jgunthorpe at obsidianresearch.com
Thu Jun 13 08:02:50 EST 2013


On Wed, Jun 12, 2013 at 11:52:32PM +0200, Arnd Bergmann wrote:
> Whether that results in an optimum mapping or not depends on the actual
> sizes for the child nodes. Since everything is a power-of-two size,
> a first-fit algorithm actually isn't bad at all.

The windows must be aligned to their size. eg 1M size window must be
aligned to a 1M boundary.

First fit only works if you allocate from largest alignment
requirement to smallest, otherwise the worst case is something like
nearly double the largest alignment wasted in alignment padding.

Jason


More information about the devicetree-discuss mailing list