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-rw-r--r--target/linux/brcm47xx/patches-3.3/192-MIPS-BCM47XX-improve-memory-size-detection.patch42
1 files changed, 42 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.3/192-MIPS-BCM47XX-improve-memory-size-detection.patch b/target/linux/brcm47xx/patches-3.3/192-MIPS-BCM47XX-improve-memory-size-detection.patch
new file mode 100644
index 000000000..548178c29
--- /dev/null
+++ b/target/linux/brcm47xx/patches-3.3/192-MIPS-BCM47XX-improve-memory-size-detection.patch
@@ -0,0 +1,42 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -1,6 +1,7 @@
+ /*
+ * Copyright (C) 2004 Florian Schirmer <jolt@tuxbox.org>
+ * Copyright (C) 2007 Aurelien Jarno <aurelien@aurel32.net>
++ * Copyright (C) 2010-2012 Hauke Mehrtens <hauke@hauke-m.de>
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms of the GNU General Public License as published by the
+@@ -60,6 +61,7 @@ static __init void prom_init_mem(void)
+ {
+ unsigned long mem;
+ unsigned long max;
++ unsigned long off, data, off1, data1;
+ struct cpuinfo_mips *c = &current_cpu_data;
+
+ /* Figure out memory size by finding aliases.
+@@ -77,15 +79,19 @@ static __init void prom_init_mem(void)
+ * max contains the biggest possible address supported by the platform.
+ * If the method wants to try something above we assume 128MB ram.
+ */
+- max = ((unsigned long)(prom_init) | ((128 << 20) - 1));
++ off = (unsigned long)prom_init;
++ data = *(unsigned long *)prom_init;
++ off1 = off + 4;
++ data1 = *(unsigned long *)off1;
++ max = off | ((128 << 20) - 1);
+ for (mem = (1 << 20); mem < (128 << 20); mem += (1 << 20)) {
+- if (((unsigned long)(prom_init) + mem) > max) {
++ if ((off + mem) > max) {
+ mem = (128 << 20);
+ printk(KERN_DEBUG "assume 128MB RAM\n");
+ break;
+ }
+- if (*(unsigned long *)((unsigned long)(prom_init) + mem) ==
+- *(unsigned long *)(prom_init))
++ if ((*(unsigned long *)(off + mem) == data) &&
++ (*(unsigned long *)(off1 + mem) == data1))
+ break;
+ }
+