dtb_early_va
if (early_init_dt_scan(dtb_early_va, dtb_early_pa)) {
const void *fdt = dtb_early_va;
dtb_early_va = kernel_mapping_pa_to_va(dtb_pa);
dtb_early_va = (void *)dtb_pa;
memblock_reserve(dtb_early_pa, fdt_totalsize(dtb_early_va));
dtb_early_va = (void *)fix_fdt_va + (dtb_pa & (PMD_SIZE - 1));