Am 23.07.2015 um 14:22 schrieb Guillaume Gardet <firstname.lastname@example.org>:
Le 23/07/2015 14:16, Andreas Färber a écrit :
Also lcd screen stays black after kernel start, probably some drm module still missing. Upstream kernel is broken. :( How did you test? Actually there's a known issue that the Exynos IOMMU support breaks graphics on the Chromebooks because they enable a
Am 20.07.2015 um 14:28 schrieb Guillaume Gardet: Le 19/07/2015 18:15, Misha Komarovskiy a écrit : framebuffer early in bootloaders, before Linux initializes the IOMMU. Since some other platforms do need the IOMMU, I fear that we're going to need a new kernel flavor... :/ Not sure if that can be scripted as lpae minus certain options?
You mean that if we disable IOMMU in kernel, graphics are working fine? CONFIG_DRM_EXYNOS_IOMMU is enabled. Should we disable it for chromebooks?
Considering that chromebooks are the only Exynos devices with an actual user base, whatever we need to do to enable those wins over other random Exynos garbage. So if all out takes is to disable the Exynos IOMMU I'm all for it. Alex
Maybe some config options compiled as module (which?) and blacklisted for chromebooks could be ok?
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