Chris Morley wrote: > Just wondering: > > When I made the driver for the Opto ac 5, I used Linux PCI driver calls > writel() and readl () to write and read the ports. > Was this bad (blocking) or slow for the realtime thread? I think there is a > more direct way (using a pointer?) > Can anyone comment?
As i understand it (poorly!), readl and writel compile to simple inlined memory accesses, so what you have should be fine. See include/asm-x86/io_32.h in the linux kernel sources. -- Sebastian Kuzminsky what i like best about 12648430 is the coffee ------------------------------------------------------------------------- This SF.Net email is sponsored by the Moblin Your Move Developer's challenge Build the coolest Linux based applications with Moblin SDK & win great prizes Grand prize is a trip for two to an Open Source event anywhere in the world http://moblin-contest.org/redirect.php?banner_id=100&url=/ _______________________________________________ Emc-developers mailing list [email protected] https://lists.sourceforge.net/lists/listinfo/emc-developers
