On Wed, Apr 09, 2014 at 06:10:11PM +0200, Alexander Stein wrote: > On Wednesday 09 April 2014 08:18:22, Guenter Roeck wrote: > > 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 ? > > Oh, I see that this patch didn't get included 1:1 as shown in that link. I only checked USE_OF in arch/x86/Kconfig which didn't get included that way :( > > > 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. > > As far as I can see, CONFIG_OF is only selected if a specific hardware is enabled. > Correct, and I expect that won't change. Default on x86 platform is ACPI. 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
