[ARM] 4845/1: Orion: Ignore memory tags with invalid data

The DNS-323, Kurobox-Pro / Linkstation-Pro, QNAP TS-109/TS-209 and some
other orion-based systems have several bogus memory entries in the tag
table, which causes the system to crash at startup. Ignore them by
resetting the tag ID to 0 in a machine fixup function.

Signed-off-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

1 files changed, 20 insertions, 0 deletions

diff --git a/arch/arm/mach-orion/common.c b/arch/arm/mach-orion/common.c
index 5f0ee4b8a9b7..2d6d413f0235 100644
--- a/arch/arm/mach-orion/common.c
+++ b/arch/arm/mach-orion/common.c
@@ -17,7 +17,9 @@
 #include <linux/mv643xx_eth.h>
 #include <linux/mv643xx_i2c.h>
 #include <asm/page.h>
+#include <asm/setup.h>
 #include <asm/timex.h>
+#include <asm/mach/arch.h>
 #include <asm/mach/map.h>
 #include <asm/arch/hardware.h>
 #include "common.h"
@@ -347,3 +349,21 @@ void __init orion_init(void)
                 platform_device_register(&orion_ehci1);
         platform_device_register(&orion_i2c);
 }
+
+/*
+ * Many orion-based systems have buggy bootloader implementations.
+ * This is a common fixup for bogus memory tags.
+ */
+void __init tag_fixup_mem32(struct machine_desc *mdesc, struct tag *t,
+                            char **from, struct meminfo *meminfo)
+{
+        for (; t->hdr.size; t = tag_next(t))
+                if (t->hdr.tag == ATAG_MEM &&
+                    (!t->u.mem.size || t->u.mem.size & ~PAGE_MASK ||
+                     t->u.mem.start & ~PAGE_MASK)) {
+                        printk(KERN_WARNING
+                               "Clearing invalid memory bank %dKB@0x%08x\n",
+                               t->u.mem.size / 1024, t->u.mem.start);
+                        t->hdr.tag = 0;
+                }
+}