Le 23/07/2015 14:16, Andreas Färber a écrit :
Hi,
Am 20.07.2015 um 14:28 schrieb Guillaume Gardet:
Le 19/07/2015 18:15, Misha Komarovskiy 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 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? Maybe some config options compiled as module (which?) and blacklisted for chromebooks could be ok? Guillaume
Regards, Andreas
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