Handle case of no mem_size_actual being present

On newer machines, mem_size_actual is 0. This patch cooks up a value when that is the case, and shoves it in the right place. Without this MMU/etc hang on M3 due to not mapping the right region. Signed-off-by: Daniel Berlin <[email protected]>
AsahiLinux · Dec 3, 2023 · 1f75f4d · 1f75f4d
1 parent 7112506
commit 1f75f4d
Showing 1 changed file with 7 additions and 0 deletions.
diff --git a/src/memory.c b/src/memory.c
@@ -401,6 +401,13 @@ static void mmu_add_default_mappings(void)
     uint64_t ram_size = cur_boot_args.mem_size + cur_boot_args.phys_base - ram_base;
     ram_size = ALIGN_DOWN(ram_size, 0x4000);
 
+    /* Mem size actual is 0 on some machines, generate a usable value in this case */
+    if (!cur_boot_args.mem_size_actual) {
+        cur_boot_args.mem_size_actual = ALIGN_UP(ram_size, BIT(32));
+        /* Update for python / subsequent stages */
+        memcpy((void *)boot_args_addr, &cur_boot_args, sizeof(cur_boot_args));
+    }
+
     printf("MMU: RAM base: 0x%lx\n", ram_base);
     printf("MMU: Top of normal RAM: 0x%lx\n", ram_base + ram_size);