[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

diff --git a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c b/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
index be628da..f635b4a 100644 (file)
--- a/target/linux/brcm-2.4/files/arch/mips/bcm947xx/prom.c
+++ b/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);
 }
 

diff --git a/target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.28/170-128MB_ram_bugfix.patch
new file mode 100644 (file)
index 0000000..e54e3de
--- /dev/null
+++ b/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);
+ }
+ 

diff --git a/target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.30/170-128MB_ram_bugfix.patch
new file mode 100644 (file)
index 0000000..e54e3de
--- /dev/null
+++ b/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);
+ }
+ 

diff --git a/target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch b/target/linux/brcm47xx/patches-2.6.31/170-128MB_ram_bugfix.patch
new file mode 100644 (file)
index 0000000..e54e3de
--- /dev/null
+++ b/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);
+ }
+