28.04.2021 08:57, Mikko Perttunen пишет: > On 4/28/21 8:51 AM, Dmitry Osipenko wrote: >> 23.04.2021 19:32, Thierry Reding пишет: >>> Note that there will be no new releases of the bootloader for earlier >>> devices, so adding support for these new DT bindings will not be >>> practical. The bootloaders on those devices do pass information about >>> the active framebuffer via the kernel command-line, so we may want to >>> add code to create reserved regions in the IOMMU based on that. >> >> Since this change requires a bootloader update anyways, why it's not >> possible to fix the bootloader properly, making it to stop all the DMA >> activity before jumping into kernel? >> > > That is not desirable, as then we couldn't have seamless > bootloader-kernel boot splash transition. The seamless transition should be more complicated since it should require to read out the hardware state in order to convert it into DRM state + display panel needs to stay ON. It's a bit questionable whether this is really needed, so far this is not achievable in mainline. Nevertheless, it will be good to have an early simple-framebuffer, which I realized only after sending out the message.
