Add support for booting on T8012 (T2) SoC #425
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marcan
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Feb 3, 2025
Address some peculiarities specific to T2: - Reserved memory at top is very large, either 512 MB or 1536 MB, and only lowest 512 MB is for OS use. - Some ranges in /arm-io/ranges is not aligned to the page size. We align them ourselves instead. - On models with a screen, the framebuffer is extremely narrow at 60 pixels in width, so add a smaller logo. Signed-off-by: Nick Chan <towinchenmi@gmail.com>
- Some devices does not have a display internal or external, do not try to prepare framebuffer on it. - On T2, memory after 512 MB is used as the ANS2 cache for the x86 CPU, since this region is very big, the mem_size_actual correction code needs to be changed. - Only half of the memory channels are used on T2 with 1 GB of memory, and this fact must be learned at runtime because the amount of memory depends on the storage configuration of the host Mac. Signed-off-by: Nick Chan <towinchenmi@gmail.com>
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This PR contains the changes required to boot the kernel on T2 per this LKML submission:
https://lore.kernel.org/asahi/20241201161942.36027-1-towinchenmi@gmail.com/T/#t
Overall T2 is similar to A10, and this takes care of the remaining:
P.S. T2 Boots on the P-core in Apple Fusion Architecture