On 2014년 07월 29일 20:59, Andreas Färber wrote: > Am 29.07.2014 10:05, schrieb Sjoerd Simons: >> On Tue, 2014-07-29 at 14:38 +0900, Inki Dae wrote: >>> On 2014년 07월 28일 23:45, Sjoerd Simons wrote: >>>> On Mon, 2014-07-28 at 23:17 +0900, Inki Dae wrote: >>>>> On 2014년 07월 28일 17:30, Sjoerd Simons wrote: >>>>> I don't see why Exynos drm driver should be auto-loaded module. I think >>>>> all devices covered by Exynos drm framework are not hot-plugged. Maybe >>>>> there is my missing point. So can you explain why Exynos drm driver >>>>> should be auto-loaded module? >>>> >>>> The background for this is that I'm building a distribution-style >>>> multiplatform kernel, that is to say a kernel which can boot on a big >>>> set of different ARM boards. As such, the intention is to keep the core >>>> zImage as small as possible and essentially build things as far as >>>> possible as loadable modules. So in a sense, all of the hardware is >>>> "hotplugged", depending on which board the kernel is actually booted on! >>>> >>>> For that use-case, exynosdrm needs to be able to build as a module >>>> (which it already can!) and it needs the required meta-data for >>>> userspace to know when it should be loaded. The latter is what my patch >>>> adds. >>> >>> It seems that you want that module data of sub drivers are added by >>> depmod to /lib/modules/KERNEL_VERSION/modules.xxxmap because some >>> hot-plug system should use modules.xxxmap file to find the proper driver >>> to load. >> >> Yes. I would like the module to export its module alias information for >> the subdrivers such that depmod can add it to its databases and the >> normal module autoloading mechanisms work as intended. Note that in my >> case, "some hot-plug" system is really just udev, not something >> special.. > > +1 here. > > While I haven't tested this on my Exynos devices yet since I'm still > working on -next kernels there, here's an example of such a 3.16 config: > > http://kernel.opensuse.org/cgit/kernel-source/tree/config/armv7hl/default > > Of the platforms enabled, all drivers are configured as modules where > possible, to keep kernel size small, and dracut (or kiwi) is used to > generate an initrd that makes available the modules. > > So it would certainly be good to have the DRM auto-load somehow, without > the user having to manually touch config files. In particular when I > think of the Chromebooks, where Wifi needs configuration on first boot > and no serial console is accessible. Got it. will merge them. However, I'm not sure that Exynos drm should have hot-plug feature such as PCI base devices: all devices covered by Exynos drm framework cannot attached and detached to and from machine. Thanks, Inki Dae > > Regards, > Andreas > -- To unsubscribe from this list: send the line "unsubscribe linux-samsung-soc" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
 |