diff options
Diffstat (limited to 'target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch')
| -rw-r--r-- | target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch | 33 |
1 files changed, 33 insertions, 0 deletions
diff --git a/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch b/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch new file mode 100644 index 0000000..9f7d5dc --- /dev/null +++ b/target/linux/brcm47xx/patches-3.3/191-MIPS-BCM47XX-ignore-last-memory-page.patch @@ -0,0 +1,33 @@ +--- a/arch/mips/bcm47xx/prom.c ++++ b/arch/mips/bcm47xx/prom.c +@@ -27,6 +27,7 @@ + #include <linux/types.h> + #include <linux/kernel.h> + #include <linux/spinlock.h> ++#include <linux/smp.h> + #include <asm/bootinfo.h> + #include <asm/fw/cfe/cfe_api.h> + #include <asm/fw/cfe/cfe_error.h> +@@ -59,6 +60,7 @@ static __init void prom_init_mem(void) + { + unsigned long mem; + unsigned long max; ++ struct cpuinfo_mips *c = ¤t_cpu_data; + + /* Figure out memory size by finding aliases. + * +@@ -87,6 +89,14 @@ 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 (c->cputype == CPU_74K && (mem == (128 << 20))) ++ mem -= 0x1000; ++ + add_memory_region(0, mem, BOOT_MEM_RAM); + } + |