Hello all, I mm/memblock.c I see this struct memblock memblock which is initialized with empty list. static struct memblock_region memblock_memory_init_regions[INIT_MEMBLOCK_REGIONS] __initdata_memblock; static struct memblock_region memblock_reserved_init_regions[INIT_MEMBLOCK_RESERVED_REGIONS] __initdata_memblock; #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP static struct memblock_region memblock_physmem_init_regions[INIT_PHYSMEM_REGIONS]; #endif struct memblock memblock __initdata_memblock = { .memory.regions = memblock_memory_init_regions, .memory.cnt = 1, /* empty dummy entry */ .memory.max = INIT_MEMBLOCK_REGIONS, .memory.name = "memory", .reserved.regions = memblock_reserved_init_regions, .reserved.cnt = 1, /* empty dummy entry */ .reserved.max = INIT_MEMBLOCK_RESERVED_REGIONS, .reserved.name = "reserved", .bottom_up = false, .current_limit = MEMBLOCK_ALLOC_ANYWHERE, }; And I guess this struct will be filled during early boot and used during boot. (I saw somewhere the memory regions are later moved to buddy allocation system for normal use). My question is : we can speicify "reserved-memory" in the device tree. Some drivers use the reserved memory for its own use. Then, are the 'reserved-memory' regions are put into this memblock.reserved regions during the boot process?(I mean during dtb parsing). Thank you! Chan Kim