On Tue, 19 Mar 2002, J. Seth Henry wrote: > Hello, > I have a particular need to read and write a single byte to a register on a > VIA chipset. I have a feeling that this is probably a lot easier than it > seems, but I haven't done anything like this before. > > I have a system with a VIA VT82C686 southbridge. Connected to several of its > general purpose I/O lines are the LCD backlight control, and several LED's. > There is a linux program available that will manipulate the register, but it > fails to work under FreeBSD. The location in memory is EE4C. I can provide > the original Linux code on request.
Is that in Memory space, or in I/O space? If it's I/O you can just i386_set_ioperm() yourself the space then inb() and outb() it from userland. 0xee4c would seem too low for a memory access point. If it's not a separate function of the southbridge, then hooking it to a driver would be tricky without some serious hackery to whatever driver is grabbing that device/function. Doug White | FreeBSD: The Power to Serve [EMAIL PROTECTED] | www.FreeBSD.org To Unsubscribe: send mail to [EMAIL PROTECTED] with "unsubscribe freebsd-hackers" in the body of the message
