On Fri, 2006-07-07 at 11:28 +0530, Daniel Rodrick wrote: > > > How about peripheral memory mapped to some addresses? Assuming I have > > > a PCI device and a on board flash PROM, would I be able to see them in > > > /proc/(k)mem ? I feel not. Am I correct? > > > > /dev/mem yes > > > > HOWEVER, there is a much nicer way to mmap a PCI device's resources, and > > that is sysfs. > > /sys/bus/pci/devices/0000:00:02.0/resource0 > > for example is the first resource of a PCI device on my system. > > No need to muck about with the dangerous /dev/mem; this one is at least > > well defined and portable across systems, including virtualization etc > > etc > > So you mean to say that if I have a device whose registers are are > memory mapped to say physical addresses "0x20020000 - 0x20020010". > Then the file /sys/bus/pci/devices/0000:00:02.0/resource0 will contain > thsi memory range as its contents? well assuming the device is 00:02.0 on the bus (obviously you need to find the right device) and that it's the first resource of the device, then yes. (and you have to mmap it, not "read"/"write") lspci -v is your friend in finding out which resource and which device it is... Greetings, Arjan van de Ven -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
