1 files changed, 39 insertions, 34 deletions

diff --git a/arch/arm/kernel/setup.c b/arch/arm/kernel/setup.c
index db2382853450..d1da92174277 100644
--- a/arch/arm/kernel/setup.c
+++ b/arch/arm/kernel/setup.c
@@ -325,28 +325,6 @@ static void __init early_print(const char *str, ...)
         printk("%s", buf);
 }
 
-static struct machine_desc * __init lookup_machine_type(unsigned int type)
-{
-        extern struct machine_desc __arch_info_begin[], __arch_info_end[];
-        struct machine_desc *p;
-
-        for (p = __arch_info_begin; p < __arch_info_end; p++)
-                if (type == p->nr)
-                        return p;
-
-        early_print("\n"
-                "Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n"
-                "Available machine support:\n\nID (hex)\tNAME\n", type);
-
-        for (p = __arch_info_begin; p < __arch_info_end; p++)
-                early_print("%08x\t%s\n", p->nr, p->name);
-
-        early_print("\nPlease check your kernel config and/or bootloader.\n");
-
-        while (true)
-                /* can't use cpu_relax() here as it may require MMU setup */;
-}
-
 static void __init feat_v6_fixup(void)
 {
         int id = read_cpuid_id();
@@ -463,21 +441,29 @@ void cpu_init(void)
 
 static struct machine_desc * __init setup_machine(unsigned int nr)
 {
-        struct machine_desc *list;
+        extern struct machine_desc __arch_info_begin[], __arch_info_end[];
+        struct machine_desc *p;
 
         /*
          * locate machine in the list of supported machines.
          */
-        list = lookup_machine_type(nr);
-        if (!list) {
-                printk("Machine configuration botched (nr %d), unable "
-                       "to continue.\n", nr);
-                while (1);
-        }
+        for (p = __arch_info_begin; p < __arch_info_end; p++)
+                if (nr == p->nr) {
+                        printk("Machine: %s\n", p->name);
+                        return p;
+                }
 
-        printk("Machine: %s\n", list->name);
+        early_print("\n"
+                "Error: unrecognized/unsupported machine ID (r1 = 0x%08x).\n\n"
+                "Available machine support:\n\nID (hex)\tNAME\n", nr);
 
-        return list;
+        for (p = __arch_info_begin; p < __arch_info_end; p++)
+                early_print("%08x\t%s\n", p->nr, p->name);
+
+        early_print("\nPlease check your kernel config and/or bootloader.\n");
+
+        while (true)
+                /* can't use cpu_relax() here as it may require MMU setup */;
 }
 
 static int __init arm_add_memory(unsigned long start, unsigned long size)
@@ -740,7 +726,7 @@ static struct init_tags {
         { tag_size(tag_core), ATAG_CORE },
         { 1, PAGE_SIZE, 0xff },
         { tag_size(tag_mem32), ATAG_MEM },
-        { MEM_SIZE, PHYS_OFFSET },
+        { MEM_SIZE },
         { 0, ATAG_NONE }
 };
 
@@ -839,6 +825,8 @@ void __init setup_arch(char **cmdline_p)
         struct machine_desc *mdesc;
         char *from = default_command_line;
 
+        init_tags.mem.start = PHYS_OFFSET;
+
         unwind_init();
 
         setup_processor();
@@ -851,8 +839,25 @@ void __init setup_arch(char **cmdline_p)
 
         if (__atags_pointer)
                 tags = phys_to_virt(__atags_pointer);
-        else if (mdesc->boot_params)
-                tags = phys_to_virt(mdesc->boot_params);
+        else if (mdesc->boot_params) {
+#ifdef CONFIG_MMU
+                /*
+                 * We still are executing with a minimal MMU mapping created
+                 * with the presumption that the machine default for this
+                 * is located in the first MB of RAM.  Anything else will
+                 * fault and silently hang the kernel at this point.
+                 */
+                if (mdesc->boot_params < PHYS_OFFSET ||
+                    mdesc->boot_params >= PHYS_OFFSET + SZ_1M) {
+                        printk(KERN_WARNING
+                               "Default boot params at physical 0x%08lx out of reach\n",
+                               mdesc->boot_params);
+                } else
+#endif
+                {
+                        tags = phys_to_virt(mdesc->boot_params);
+                }
+        }
 
 #if defined(CONFIG_DEPRECATED_PARAM_STRUCT)
         /*