new file mode 100644
--- /dev/null
+++ b/packages/hal/mips/ref4955/current/src/hal_diag.c
@@ -0,0 +1,209 @@
+//=============================================================================
+//
+//      hal_diag.c
+//
+//      HAL diagnostic output code
+//
+//=============================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// -------------------------------------------                              
+// The contents of this file are subject to the Red Hat eCos Public License 
+// Version 1.1 (the "License"); you may not use this file except in         
+// compliance with the License.  You may obtain a copy of the License at    
+// http://www.redhat.com/                                                   
+//                                                                          
+// Software distributed under the License is distributed on an "AS IS"      
+// basis, WITHOUT WARRANTY OF ANY KIND, either express or implied.  See the 
+// License for the specific language governing rights and limitations under 
+// the License.                                                             
+//                                                                          
+// The Original Code is eCos - Embedded Configurable Operating System,      
+// released September 30, 1998.                                             
+//                                                                          
+// The Initial Developer of the Original Code is Red Hat.                   
+// Portions created by Red Hat are                                          
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.                             
+// All Rights Reserved.                                                     
+// -------------------------------------------                              
+//                                                                          
+//####COPYRIGHTEND####
+//=============================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   jskov
+// Contributors:nickg, jskov
+// Date:        2000-05-10
+// Purpose:     HAL diagnostic output
+// Description: Implementations of HAL diagnostic output support.
+//
+//####DESCRIPTIONEND####
+//
+//=============================================================================
+
+#include <pkgconf/hal.h>
+
+#if !defined(CYGSEM_HAL_VIRTUAL_VECTOR_DIAG)
+
+#include <cyg/infra/cyg_type.h>         // base types
+#include <cyg/infra/cyg_trac.h>         // tracing macros
+#include <cyg/infra/cyg_ass.h>          // assertion macros
+
+#include <cyg/hal/hal_arch.h>
+#include <cyg/hal/hal_diag.h>
+
+#include <cyg/hal/hal_intr.h>
+#include <cyg/hal/hal_misc.h>           // Helper functions
+
+#include <cyg/hal/hal_io.h>
+
+#include <cyg/hal/hal_if.h>             // ROM calling interface
+
+#if defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
+#include <cyg/hal/hal_stub.h>           // CYG_HAL_GDB_x_CRITICAL_IO_REGION
+#endif
+
+externC void cyg_hal_plf_serial_init_channel(void* __ch_data);
+externC void cyg_hal_plf_serial_putc(void* __ch_data, cyg_uint8 __ch);
+externC cyg_uint8 cyg_hal_plf_serial_getc(void* __ch_data);
+
+//-----------------------------------------------------------------------------
+// Hit the hardware directly. Either wrap in GDB O-packets, or write
+// data raw to device.
+
+// Decide when to wrap text output as GDB O-packets
+#if (CYGNUM_HAL_VIRTUAL_VECTOR_DEBUG_CHANNEL \
+     == CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL)
+
+#if defined(CYGSEM_HAL_USE_ROM_MONITOR_GDB_stubs) \
+    || defined(CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS)
+
+#define CYG_DIAG_GDB
+
+#endif
+
+#endif
+
+//-----------------------------------------------------------------------------
+// There are two serial ports. Hardwire to use one of them.
+#define CYG_DEVICE_SERIAL_SCC1    0xb40003f8 // port 1
+#define CYG_DEVICE_SERIAL_SCC2    0xb40002f8 // port 2
+
+typedef struct {
+    cyg_uint8* base;
+    cyg_int32 msec_timeout;
+    int isr_vector;
+} channel_data_t;
+
+#if (CYGNUM_HAL_VIRTUAL_VECTOR_CONSOLE_CHANNEL == 0)
+#define BASE ((cyg_uint8*)CYG_DEVICE_SERIAL_SCC1)
+#else
+#define BASE ((cyg_uint8*)CYG_DEVICE_SERIAL_SCC2)
+#endif
+
+static channel_data_t channel = { BASE, 0, 0};
+
+#ifdef CYG_DIAG_GDB
+
+void 
+hal_diag_write_char(char c)
+{
+    static char line[100];
+    static int pos = 0;
+
+    // No need to send CRs
+    if( c == '\r' ) return;
+
+    line[pos++] = c;
+
+    if( c == '\n' || pos == sizeof(line) )
+    {
+        CYG_INTERRUPT_STATE old;
+
+        // Disable interrupts. This prevents GDB trying to interrupt us
+        // while we are in the middle of sending a packet. The serial
+        // receive interrupt will be seen when we re-enable interrupts
+        // later.
+#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
+        CYG_HAL_GDB_ENTER_CRITICAL_IO_REGION(old);
+#else
+        HAL_DISABLE_INTERRUPTS(old);
+#endif
+        
+        while(1)
+        {
+            static char hex[] = "0123456789ABCDEF";
+            cyg_uint8 csum = 0;
+            int i;
+            char c1;
+        
+            cyg_hal_plf_serial_putc(&channel, '$');
+            cyg_hal_plf_serial_putc(&channel, 'O');
+            csum += 'O';
+            for( i = 0; i < pos; i++ )
+            {
+                char ch = line[i];
+                char h = hex[(ch>>4)&0xF];
+                char l = hex[ch&0xF];
+                cyg_hal_plf_serial_putc(&channel, h);
+                cyg_hal_plf_serial_putc(&channel, l);
+                csum += h;
+                csum += l;
+            }
+            cyg_hal_plf_serial_putc(&channel, '#');
+            cyg_hal_plf_serial_putc(&channel, hex[(csum>>4)&0xF]);
+            cyg_hal_plf_serial_putc(&channel, hex[csum&0xF]);
+
+            c1 = cyg_hal_plf_serial_getc(&channel);
+
+            if( c1 == '+' ) break;
+        }
+        
+        pos = 0;
+        // And re-enable interrupts
+#ifdef CYGDBG_HAL_DEBUG_GDB_INCLUDE_STUBS
+        CYG_HAL_GDB_LEAVE_CRITICAL_IO_REGION(old);
+#else
+        HAL_RESTORE_INTERRUPTS(old);
+#endif
+    }
+}
+
+void 
+hal_diag_read_char(char *c)
+{
+    *c = cyg_hal_plf_serial_getc(&channel);
+}
+
+#else // CYG_DIAG_GDB
+
+// Hit the hardware directly, no GDB translation
+
+void 
+hal_diag_read_char(char *c)
+{
+    *c = cyg_hal_plf_serial_getc(&channel);
+}
+
+void 
+hal_diag_write_char(char c)
+{
+    cyg_hal_plf_serial_putc(&channel, c);
+}
+
+
+#endif
+
+// Reagardless whether encoding or not we alway initialize the device.
+
+void 
+hal_diag_init(void)
+{
+    // Init serial device
+    cyg_hal_plf_serial_init_channel((void*)&channel);
+}
+
+#endif // CYGSEM_HAL_VIRTUAL_VECTOR_DIAG
+
+//-----------------------------------------------------------------------------
+// End of hal_diag.c