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diff --git a/tools/src/infra/diag.h b/tools/src/infra/diag.h
new file mode 100644
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+++ b/tools/src/infra/diag.h
@@ -0,0 +1,106 @@
+#ifndef CYGONCE_INFRA_DIAG_H
+#define CYGONCE_INFRA_DIAG_H
+
+/*=============================================================================
+//
+//      diag.h
+//
+//      Diagnostic Routines for Infra Development
+//
+//==========================================================================
+//####COPYRIGHTBEGIN####
+//                                                                          
+// ----------------------------------------------------------------------------
+// Copyright (C) 1998, 1999, 2000 Red Hat, Inc.
+//
+// This file is part of the eCos host tools.
+//
+// This program is free software; you can redistribute it and/or modify it 
+// under the terms of the GNU General Public License as published by the Free 
+// Software Foundation; either version 2 of the License, or (at your option) 
+// any later version.
+// 
+// This program is distributed in the hope that it will be useful, but WITHOUT 
+// ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or 
+// FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for 
+// more details.
+// 
+// You should have received a copy of the GNU General Public License along with
+// this program; if not, write to the Free Software Foundation, Inc., 
+// 59 Temple Place - Suite 330, Boston, MA  02111-1307, USA.
+//
+// ----------------------------------------------------------------------------
+//                                                                          
+//####COPYRIGHTEND####
+//==========================================================================
+//#####DESCRIPTIONBEGIN####
+//
+// Author(s):   nickg
+// Contributors:        nickg
+// Date:        1998-03-02
+// Purpose:     Diagnostic Routines for Infra Development
+// Description: Diagnostic routines for use during infra development.
+// Usage:       #include <cyg/infra/diag.h>
+//
+//####DESCRIPTIONEND####
+//
+//==========================================================================*/
+
+#include <pkgconf/infra.h>
+#include <cyg/infra/cyg_type.h>
+
+#ifdef CYGDBG_INFRA_DIAG_PRINTF_USE_VARARG
+#include <stdarg.h>
+#endif
+
+#ifdef CYGDBG_INFRA_DIAG_USE_DEVICE
+#include <cyg/io/io_diag.h>
+#endif
+
+/*---------------------------------------------------------------------------*/
+/* Diagnostic routines                                                       */
+
+externC void diag_init(void);         /* Initialize, call before any others*/
+
+externC void diag_write_char(char c); /* Write single char to output       */
+
+externC void diag_write_string(const char *psz); /* Write zero terminated string */
+
+externC void diag_write_dec( cyg_int32 n);    /* Write decimal value       */
+
+externC void diag_write_hex( cyg_uint32 n);   /* Write hexadecimal value   */
+
+externC void diag_dump_buf(void *buf, CYG_ADDRWORD len);
+
+#ifdef CYGDBG_INFRA_DIAG_PRINTF_USE_VARARG
+
+externC void diag_printf( const char *fmt, ... );  /* Formatted print      */
+
+#else
+
+// This function deliberately has a K&R prototype to avoid having to use
+// varargs, or pad arglists or anything grody like that.
+
+#warning CYGDBG_INFRA_DIAG_PRINTF_USE_VARARG not enabled
+#warning Expect a "function declaration isn't a prototype" warning
+
+externC void diag_printf(/* const char *fmt, CYG_ADDRWORD, CYG_ADDRWORD,
+                         CYG_ADDRWORD, CYG_ADDRWORD, CYG_ADDRWORD,
+                         CYG_ADDRWORD, CYG_ADDRWORD, CYG_ADDRWORD */);
+
+#endif
+
+/*---------------------------------------------------------------------------*/
+/* Internal Diagnostic MACROS                                                */
+
+#ifdef CYGDBG_INFRA_DIAG_USE_DEVICE
+#define DIAG_DEVICE_START_SYNC()        diag_device_start_sync()
+#define DIAG_DEVICE_END_SYNC()          diag_device_end_sync()
+#else
+#define DIAG_DEVICE_START_SYNC()
+#define DIAG_DEVICE_END_SYNC()
+#endif
+
+/*---------------------------------------------------------------------------*/
+#endif /* CYGONCE_INFRA_DIAG_H */
+/* EOF diag.h */