--- tmp/ecos-trunk-2006-11-17/ecos/packages/devs/serial/generic/16x5x/current/src/ser_16x5x.c	2006-02-08 11:28:04.000000000 +0100
+++ work/ecos/ecos/packages/devs/serial/generic/16x5x/current/src/ser_16x5x.c	2006-11-16 16:54:39.000000000 +0100
@@ -90,6 +90,7 @@
 #define IER_XMT 0x02
 #define IER_LS  0x04
 #define IER_MS  0x08
+#define IER_UUE 0x40          // UART enable, e.g. in Intel PXA 255 and PXA 270
 
 // Line Control Register
 #define LCR_WL5 0x00    // Word length
@@ -256,6 +257,7 @@ serial_config_port(serial_channel *chan,
 
         /* First, find out what kind of device it is. */
         ser_chan->deviceType = sNone;
+        HAL_WRITE_UINT8(base+REG_ier, IER_UUE);  // if this bit exists it must be set for this test
         HAL_WRITE_UINT8(base+REG_mcr, MCR_LOOP); // enable loopback mode
         HAL_READ_UINT8(base+REG_msr, b);         
         if (0 == (b & 0xF0)) {   // see if MSR had CD, RI, DSR or CTS set
@@ -326,6 +328,7 @@ serial_config_port(serial_channel *chan,
 #ifdef CYGOPT_IO_SERIAL_SUPPORT_LINE_STATUS
     _ier |= (IER_LS|IER_MS);
 #endif
+    _ier |= IER_UUE;
     HAL_WRITE_UINT8(base+REG_ier, _ier);
 
     if (new_config != &chan->config) {