On Tue, 12 Dec 2006 12:09:02 -0800 Ashlesha Shintre <ashlesha@xxxxxxxxxx> wrote: > Hi, > > Is there a document that outlines the meaning of these flags in the 8250 > serial driver? Try include/linux/serial.h - each ASYNC_ entry has a comment explaining what it does, and that covers your UP_ stuff fairly completely.