On Wed, Apr 09, 2014 at 04:03:14PM +0200, Alexander Stein wrote: > On Wednesday 09 April 2014 14:58:48, One Thousand Gnomes wrote: > > > I'm getting curious: How can I use device-tree on x86(_64)? > > > Reading the dependencies from CONFIG_OF it can only be used on 32bit systems with some special hardware bases. > > > So, how to use otherwise? > > > > There isn't any fundamental thing tying device tree to a given > > architecture or 32bitness, it's just that sane PC architectures use ACPI > > to enumerate devices, and/or have a discoverable bus architecture. > > > > Some of the phones don't so this now becoems a point of consideration. In > > fact it's already also used on CE4100 (which is an embedded media SoC > > found in some TV devices and set-top boxes) and on the OLPC (One laptop > > per child). There is no intrinsic reason it couldn't be used in other x86 > > special cases. > > > > If its PC shaped however it probably has ACPI and ACPI and DT are not a > > 1:1 mapping. ACPI has method invocations, and various firmware provided > > interfaces such as the EC, Device tree is better at some other bits. > > Yep, like SPI devices on embedded x86 hardware. > > > Converting the phones to embedded device tree rather than adding a > > billion little platform files on the other hand seems to me like a > > no-brainer. > > I found http://thread.gmane.org/gmane.linux.drivers.devicetree/4475. Why didn't that get into mainline? > Isn't that patch set in mainline ? We are working on a patch set to make DT support on x86 more widely available. Thierry Reding did some work on it a while ago. Some of it is upstream, other parts are available in https://github.com/avionic-design/linux/commits/medatom/master We'll see if and what will be accepted upstream. Guenter -- To unsubscribe from this list: send the line "unsubscribe linux-watchdog" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
