11630 remove checks for 64-bit capable hardware

*** 274,288 ****
  uint_t hblk_alloc_dynamic = 0;
  uint_t hblk1_min = H1MIN;
  
  
  /*
-  * Hook for down-rev firmware
-  */
- static void do_prom_version_check(void);
- 
- /*
   * After receiving a thermal interrupt, this is the number of seconds
   * to delay before shutting off the system, assuming
   * shutdown fails.  Use /etc/system to change the delay if this isn't
   * large enough.
   */
--- 274,283 ----
*** 1515,1530 ****
          param_calc(0);
  
          mod_setup();
  
          /*
-          * If we are running firmware that isn't 64-bit ready
-          * then complain and halt.
-          */
-         do_prom_version_check();
- 
-         /*
           * Initialize system parameters
           */
          param_init();
  
          /*
--- 1510,1519 ----
*** 3086,3132 ****
  startup_create_io_node(void)
  {
          prom_interpret(create_node, 0, 0, 0, 0, 0);
  }
  
- 
- static void
- do_prom_version_check(void)
- {
-         int i;
-         pnode_t node;
-         char buf[64];
-         static char drev[] = "Down-rev firmware detected%s\n"
-             "\tPlease upgrade to the following minimum version:\n"
-             "\t\t%s\n";
- 
-         i = prom_version_check(buf, sizeof (buf), &node);
- 
-         if (i == PROM_VER64_OK)
-                 return;
- 
-         if (i == PROM_VER64_UPGRADE) {
-                 cmn_err(CE_WARN, drev, "", buf);
- 
- #ifdef  DEBUG
-                 prom_enter_mon();       /* Type 'go' to continue */
-                 cmn_err(CE_WARN, "Booting with down-rev firmware\n");
-                 return;
- #else
-                 halt(0);
- #endif
-         }
- 
-         /*
-          * The other possibility is that this is a server running
-          * good firmware, but down-rev firmware was detected on at
-          * least one other cpu board. We just complain if we see
-          * that.
-          */
-         cmn_err(CE_WARN, drev, " on one or more CPU boards", buf);
- }
- 
  
  /*
   * Must be defined in platform dependent code.
   */
  extern caddr_t modtext;
--- 3075,3084 ----