1 files changed, 13 insertions, 1 deletions

diff --git a/arch/powerpc/mm/fsl_booke_mmu.c b/arch/powerpc/mm/fsl_booke_mmu.c
index 1dabe1a1751b..dfd292748e6e 100644
--- a/arch/powerpc/mm/fsl_booke_mmu.c
+++ b/arch/powerpc/mm/fsl_booke_mmu.c
@@ -179,9 +179,14 @@ void __init
 adjust_total_lowmem(void)
 {
         phys_addr_t ram;
-        unsigned int max_cam = 28;      /* 2^28 = 256 Mb */
+        unsigned int max_cam = (mfspr(SPRN_TLB1CFG) >> 16) & 0xff;
         char buf[ARRAY_SIZE(cam) * 5 + 1], *p = buf;
         int i;
+        unsigned long virt = PAGE_OFFSET & 0xffffffffUL;
+        unsigned long phys = memstart_addr & 0xffffffffUL;
+
+        /* Convert (4^max) kB to (2^max) bytes */
+        max_cam = max_cam * 2 + 10;
 
         /* adjust lowmem size to __max_low_memory */
         ram = min((phys_addr_t)__max_low_memory, (phys_addr_t)total_lowmem);
@@ -190,11 +195,18 @@ adjust_total_lowmem(void)
         __max_low_memory = 0;
         for (i = 0; ram && i < ARRAY_SIZE(cam); i++) {
                 unsigned int camsize = __ilog2(ram) & ~1U;
+                unsigned int align = __ffs(virt | phys) & ~1U;
+
+                if (camsize > align)
+                        camsize = align;
                 if (camsize > max_cam)
                         camsize = max_cam;
+
                 cam[i] = 1UL << camsize;
                 ram -= cam[i];
                 __max_low_memory += cam[i];
+                virt += cam[i];
+                phys += cam[i];
 
                 p += sprintf(p, "%lu/", cam[i] >> 20);
         }