[PATCH] add big endian version of ld_/st_ IO access macros and convert main 8xx code to use it

Dan Malek dan at embeddededge.com
Thu Sep 8 23:56:52 EST 2005

On Sep 8, 2005, at 12:27 AM, Paul Mackerras wrote:

> Given how long it takes to access I/O devices, I don't believe an
> extra instruction or two is going to make a measurable difference.

That's kind of true.  However, the access to the CPM is nearly
instruction speed, except in the case when you actually use a
real IO register (like a GPIO on a port), then it's a little slower.

	-- Dan

More information about the Linuxppc-embedded mailing list