Use SUN-style checksums per default. The checksums on SUN OPB
(at least on SPARC Enterprise platforms: M4000, M9000) is not
implemented according to Open Firmware IEEE 1275-1994. This
patch creates bug compatibility.

Signed-off-by: Stefan Reinauer <stepan@coresystems.de>

Index: toke/emit.c
===================================================================
--- toke/emit.c	(revision 670)
+++ toke/emit.c	(working copy)
@@ -7,7 +7,7 @@
  *  This program is part of a free implementation of the IEEE 1275-1994 
  *  Standard for Boot (Initialization Configuration) Firmware.
  *
- *  Copyright (C) 2001-2005 Stefan Reinauer, <stepan@openbios.org>
+ *  Copyright (C) 2001-2010 Stefan Reinauer, <stepan@openbios.org>
  *
  *  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
@@ -317,7 +317,7 @@
 	/*  Calculate and place checksum and length, if haven't already  */
 	if ( fcode_start_ob_off != -1 )
 	{
-	    u16 checksum;
+	    u32 checksum;
 	    int length;
 
 	    u8 *fcode_body = ostart+fcode_body_ob_off;
@@ -331,7 +331,17 @@
 	              fcode_body < ob_end ;
 		          checksum += *(fcode_body++) ) ;
 
-	    BIG_ENDIAN_WORD_STORE(fcode_hdr->checksum , checksum);
+	    if (sun_style_checksums) {
+		/* SUN OPB on the SPARC (Enterprise) platforms: M4000, M9000
+		 * expects a checksum algorithm that is not compliant to 
+		 * IEEE 1275-1994 section 5.2.2.5
+		 */
+		checksum = (checksum & 0xffff) + (checksum >> 16);
+		checksum = (checksum & 0xffff) + (checksum >> 16);
+	    }
+
+	    BIG_ENDIAN_WORD_STORE(fcode_hdr->checksum, 
+		    (u16)(checksum & 0xffff));
 	    BIG_ENDIAN_LONG_STORE(fcode_hdr->length , length);
 
 	if (verbose)
Index: toke/clflags.c
===================================================================
--- toke/clflags.c	(revision 670)
+++ toke/clflags.c	(working copy)
@@ -5,7 +5,7 @@
  *  This program is part of a free implementation of the IEEE 1275-1994
  *  Standard for Boot (Initialization Configuration) Firmware.
  *
- *  Copyright (C) 2001-2005 Stefan Reinauer, <stepan@openbios.org>
+ *  Copyright (C) 2001-2010 Stefan Reinauer, <stepan@openbios.org>
  *
  *  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
@@ -94,6 +94,7 @@
 bool ibm_legacy_separator_message = TRUE ;
 bool enable_abort_quote = TRUE ;
 bool sun_style_abort_quote = TRUE ;
+bool sun_style_checksums = TRUE ;
 bool abort_quote_throw = TRUE ;
 bool string_remark_escape = TRUE ;
 bool hex_remark_escape = TRUE ;
@@ -181,6 +182,11 @@
 	"\t",
 	    "Use -2 THROW in an Abort\" phrase, rather than ABORT"     } ,
 
+  { "Sun-Checksums",
+        &sun_style_checksums,
+	"\t\t",
+	    "Use this for SPARC (Enterprise) platforms: M4000, M9000"     } ,
+
   { "String-remark-escape",
         &string_remark_escape,
 	"\t",
@@ -640,8 +646,8 @@
 
    for ( indx = 0 ; indx < number_of_cl_flags ; indx++ )
     {
-	printf("  %s    %s%s%s\n",
-	    *(cl_flags_list[indx].flag_var) ? "  " : "no" ,
+	printf(" %s    %s%s%s\n",
+	    *(cl_flags_list[indx].flag_var) ? "yes" : "no " ,
 	    cl_flags_list[indx].clflag_name,
 	    cl_flags_list[indx].clflag_tabs,
 	    cl_flags_list[indx].clflag_expln);
Index: toke/clflags.h
===================================================================
--- toke/clflags.h	(revision 670)
+++ toke/clflags.h	(working copy)
@@ -8,7 +8,7 @@
  *  This program is part of a free implementation of the IEEE 1275-1994
  *  Standard for Boot (Initialization Configuration) Firmware.
  *
- *  Copyright (C) 2001-2005 Stefan Reinauer, <stepan@openbios.org>
+ *  Copyright (C) 2001-2010 Stefan Reinauer, <stepan@openbios.org>
  *
  *  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
@@ -56,6 +56,7 @@
  *          ibm_legacy_separator_message
  *          enable_abort_quote
  *          sun_style_abort_quote
+ *          sun_style_checksums
  *          string_remark_escape
  *          hex_remark_escape
  *          c_style_string_escape
@@ -111,6 +112,7 @@
 extern bool ibm_legacy_separator_message;
 extern bool enable_abort_quote;
 extern bool sun_style_abort_quote;
+extern bool sun_style_checksums;
 extern bool abort_quote_throw;
 extern bool string_remark_escape;
 extern bool hex_remark_escape;