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Heinrich Schuchardt <heinrich.schuchardt@canonical.com> says: To implement the EFI_SYSTEM_TABLE_POINTER we need 4 MiB aligned memory. On the sandbox LMB uses addresses relative to the start of a page aligned RAM buffer allocated with mmap(). This leads to a mismatch of alignment between EFI which uses pointers and LMB which uses phys_addr_t. Ensure that the RAM buffer used for LMB is 4 MiB aligned. Provide a unit test for efi_alloc_aligned_pages() verifying this alignment. Do not overwrite RAM size in dram_init(). Link: https://lore.kernel.org/r/20250608075428.32631-1-heinrich.schuchardt@canonical.com