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Re: CVS commit: src/sys/arch/arm/iomd

On Sun, Feb 03, 2008 at 07:38:29PM +0000, Chris Gilbert wrote:
> Module Name:  src
> Committed By: chris
> Date:         Sun Feb  3 19:38:29 UTC 2008
> Modified Files:
>       src/sys/arch/arm/iomd: vidcvideo.c
> Log Message:
> Use memmove rather than memcpy when moving rows around the framebuffer.
> This fixes a problem where scrolling down fills the whole screen with the
> first line on screen.

When I was doing that (on a SA1100/SA1101 system) I found scrolling was
very slow unless I read from a virtual address that had the framebuffer
cached (in the mini-cache) - but wrote to the uncached address.
Unfortunately the two addresses were such that the naive copy code
always did a reverse copy :-(


David Laight:

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