08.04.2021 17:07, Dmitry Osipenko пишет: >> Whatever happened to the idea of creating identity mappings based on the >> obscure tegra_fb_mem (or whatever it was called) command-line option? Is >> that command-line not universally passed to the kernel from bootloaders >> that initialize display? > This is still a good idea! The command-line isn't universally passed > just because it's up to a user to override the cmdline and then we get a > hang (a very slow boot in reality) on T30 since display client takes out > the whole memory bus with the constant SMMU faults. For example I don't > have that cmdline option in my current setups. > Thinking a bit more about the identity.. have you consulted with the memory h/w people about whether it's always safe to enable ASID in a middle of DMA request?
