--- QNX/src/hardware/devb/ram/sim.c       2008-08-13 18:02:12.000000000 -0400
+++ ./sim.c     2008-08-19 16:32:37.171875000 -0400
@@ -548,11 +548,42 @@
                        }
                }
                else {
+#ifdef NOT_ARM_FCSE_LIMITED
                        if( ( ext->ram = cam_calloc( ext->ram_capacity, ext->ram_blksize ) ) == NULL ) {
                                ram_slogf( hba, _SLOGC_SIM_RAM, _SLOG_ERROR, 0, "ram_sim_attach:  malloc size %d - %s",
                                        ext->ram_capacity * ext->ram_blksize, strerror( errno ) );
                                return( CAM_FAILURE );
                        }
+#else
+    /* Create a new memory object */
+    int fd = shm_open( "/dev/shmem/dos", O_RDWR | O_CREAT, 0700);
+    if( fd == -1 )
+    {
+       ram_slogf( hba, _SLOGC_SIM_RAM, _SLOG_ERROR, 0, "ram_sim_attach:  shmopen size %d - %s",
+          ext->ram_capacity * ext->ram_blksize, strerror( errno ) );
+       return CAM_FAILURE;
+    }
+
+    // ANON is zero-fill
+    // GLOBAL allows our process to use cache and have more than 32MB of it
+    // PRIV means that no screwing around for context switching
+    // if (shm_ctl( fd, SHMCTL_ANON|SHMCTL_GLOBAL|SHMCTL_PRIV,
+    if (shm_ctl( fd, SHMCTL_ANON | SHMCTL_PRIV | SHMCTL_GLOBAL,
+                 (_uint64) 0,
+                 (_uint64) ext->ram_capacity * ext->ram_blksize ) == -1)
+    {
+       // this fails for other than the first caller
+       // perror("dos ramdisk shmctl");
+    }
+
+    ext->ram = mmap( 0, ext->ram_capacity * ext->ram_blksize,
+                 PROT_READ | PROT_WRITE | PROT_NOCACHE,
+                 MAP_SHARED, fd, 0 );
+
+    // this will force the code to do an munmap rather than a bad free
+    ext->ram_phys = -1;
+
+#endif
                }

 #ifdef RAMDISK_QNX4_DINIT