Commit f71a1a42 authored by Catalin Marinas's avatar Catalin Marinas
Browse files

arm64: Ignore memory blocks below PHYS_OFFSET

According to Documentation/arm64/booting.txt, the kernel image must be
loaded at a pre-defined offset from the start of RAM so that the kernel
can calculate PHYS_OFFSET based on this address. If the DT contains
memory blocks below this PHYS_OFFSET, report them and ignore the
corresponding memory range.

Signed-off-by: default avatarCatalin Marinas <>
parent c60b0c28
......@@ -170,7 +170,19 @@ static void __init setup_machine_fdt(phys_addr_t dt_phys)
void __init early_init_dt_add_memory_arch(u64 base, u64 size)
base &= PAGE_MASK;
size &= PAGE_MASK;
if (base + size < PHYS_OFFSET) {
pr_warning("Ignoring memory block 0x%llx - 0x%llx\n",
base, base + size);
if (base < PHYS_OFFSET) {
pr_warning("Ignoring memory range 0x%llx - 0x%llx\n",
size -= PHYS_OFFSET - base;
memblock_add(base, size);
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