[brcm47xx] fix problem with 128MB ram.

This patch is out of broadcoms official source code


git-svn-id: svn://svn.openwrt.org/openwrt/trunk@18413 3c298f89-4303-0410-b956-a3cf2f4a3e73

target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c

@@ -31,6 +31,15 @@ prom_init(int argc, const char **argv)
 		    *(unsigned long *)(prom_init))
 			break;
 	}
+
+	/* Ignoring the last page when ddr size is 128M. Cached
+	 * accesses to last page is causing the processor to prefetch
+	 * using address above 128M stepping out of the ddr address
+	 * space.
+	 */
+	if (mem == 0x8000000)
+		mem -= 0x1000;
+
 	add_memory_region(0, mem, BOOT_MEM_RAM);
 }
 

target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch

@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -141,6 +141,14 @@ static __init void prom_init_mem(void)
+ 			break;
+ 	}
+ 
++	/* Ignoring the last page when ddr size is 128M. Cached
++	 * accesses to last page is causing the processor to prefetch
++	 * using address above 128M stepping out of the ddr address
++	 * space.
++	 */
++	if (mem == 0x8000000)
++		mem -= 0x1000;
++
+ 	add_memory_region(0, mem, BOOT_MEM_RAM);
+ }
+ 

target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch

@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -141,6 +141,14 @@ static __init void prom_init_mem(void)
+ 			break;
+ 	}
+ 
++	/* Ignoring the last page when ddr size is 128M. Cached
++	 * accesses to last page is causing the processor to prefetch
++	 * using address above 128M stepping out of the ddr address
++	 * space.
++	 */
++	if (mem == 0x8000000)
++		mem -= 0x1000;
++
+ 	add_memory_region(0, mem, BOOT_MEM_RAM);
+ }
+ 

target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch

@@ -0,0 +1,17 @@
+--- a/arch/mips/bcm47xx/prom.c
++++ b/arch/mips/bcm47xx/prom.c
+@@ -141,6 +141,14 @@ static __init void prom_init_mem(void)
+ 			break;
+ 	}
+ 
++	/* Ignoring the last page when ddr size is 128M. Cached
++	 * accesses to last page is causing the processor to prefetch
++	 * using address above 128M stepping out of the ddr address
++	 * space.
++	 */
++	if (mem == 0x8000000)
++		mem -= 0x1000;
++
+ 	add_memory_region(0, mem, BOOT_MEM_RAM);
+ }
+