Hello, On Fri, Nov 4, 2011 at 8:58 AM, loody <miloody@gmail.com> wrote:

Hi all: I found except DMA transfer, there is a mode called PIO. Where I can find the document of this and what is full name of it?

Use search engine powers on PIO, for "Programmed Input/Output". It's not Linux specific, it's computer / micro-architecture specific terminology. Regards, -- Leon