04.10.2021 22:23, Thierry Reding пишет: > On Sun, Oct 03, 2021 at 04:09:56AM +0300, Dmitry Osipenko wrote: >> 23.04.2021 19:32, Thierry Reding пишет: >>> I've made corresponding changes in the proprietary bootloader, added a >>> compatibility shim in U-Boot (which forwards information created by the >>> proprietary bootloader to the kernel) and the attached patches to test >>> this on Jetson TX1, Jetson TX2 and Jetson AGX Xavier. >> >> Could you please tell what downstream kernel does for coping with the >> identity mappings in conjunction with the original proprietary bootloader? >> >> If there is some other method of passing mappings to kernel, could it be >> supported by upstream? Putting burden on users to upgrade bootloader >> feels a bit inconvenient. > > It depends on the chip generation. As far as I know there have been > several iterations. The earliest was to pass this information via a > command-line option, but more recent versions use device tree to pass > this information in a similar way as described here. However, these > use non-standard DT bindings, so I don't think we can just implement > them as-is. Is it possible to boot upstream kernel with that original bootloader? I remember seeing other platforms, like QCOM, supporting downstream quirks in upstream kernel on a side, i.e. they are undocumented, but the additional support code is there. That is what "normal" people want. You should consider doing that for Tegra too, if possible.
