Index: /trunk/src/VBox/Devices/Serial/DevSerial.cpp
===================================================================
--- /trunk/src/VBox/Devices/Serial/DevSerial.cpp	(revision 12424)
+++ /trunk/src/VBox/Devices/Serial/DevSerial.cpp	(revision 12425)
@@ -242,8 +242,4 @@
     if (RT_LIKELY(s->pDrvChar))
         s->pDrvChar->pfnSetParameters(s->pDrvChar, speed, parity, data_bits, stop_bits);
-#ifdef RT_OS_DARWIN
-    if (RT_LIKELY(s->pDrvChar))
-        s->cNsDelay = (69444 - 2000) / s->divider; /* 69444 == 1000,000,000 / (115,000 / 8); 2000 = fudge factor */
-#endif
 }
 
@@ -390,11 +386,4 @@
     case 5:
         ret = s->lsr;
-#ifdef RT_OS_DARWIN
-        if (    !(ret & UART_LSR_THRE)
-            &&   pThis->HeldXmitNanoTS
-            &&  RTTimeNanoTS() - s->HeldXmitNanoTS >= s->cNsDelay) {
-            ret = s->lsr |= UART_LSR_THRE;
-        }
-#endif
         break;
     case 6: