main/system/boot/syslinux/files/fixisohybrid.patch

--- syslinux-5.00-orig/utils/isohybrid.pl	2012-12-06 21:51:22.000000000 +0200
+++ syslinux-5.00/utils/isohybrid.pl	2013-02-07 18:55:28.423760149 +0200
@@ -44,6 +44,7 @@
     'id'     => [0, 0xffffffff],
     'hd0'    => [0, 2],
     'partok' => [0, 1],
+    'fat'    => [0, 1],
 );
 
 # Boolean options just set other options
@@ -53,6 +54,7 @@
     'ctrlhd0'  => ['hd0', 2],
     'nopartok' => ['partok', 0],
     'partok'   => ['partok', 1],
+    'fatfirst' => ['fat', 1],
 );
 
 sub usage() {
@@ -66,7 +68,8 @@
     "  -id         Specify MBR ID (default random)\n",
     "  -forcehd0   Always assume we are loaded as disk ID 0\n",
     "  -ctrlhd0    Assume disk ID 0 if the Ctrl key is pressed\n",
-    "  -partok     Allow booting from within a partition\n";
+    "  -partok     Allow booting from within a partition\n",
+    "  -fatfirst   Create a small fat partition first\n";
     exit 1;
 }
 
@@ -221,9 +224,9 @@
 
 # Print partition table
 $offset  = $opt{'offset'};
-$psize   = $c*$h*$s - $offset;
+$psize   = $c*$h*$s - $offset - 1;
 $bhead   = int($offset/$s) % $h;
-$bsect   = ($offset % $s) + 1;
+$bsect   = ($offset % $s) + 1 + 1;
 $bcyl    = int($offset/($h*$s));
 $bsect  += ($bcyl & 0x300) >> 2;
 $bcyl   &= 0xff;
@@ -233,10 +236,29 @@
 $fstype  = $opt{'type'};	# Partition type
 $pentry  = $opt{'entry'};	# Partition slot
 
+$offset += $psize;
+$psize1   = $cylsize/512;
+$bhead1   = int(($offset+1)/$s) % $h;
+$bsect1   = (($offset+1) % $s) + 1;
+$bcyl1    = int(($offset+1)/($h*$s));
+$bsect1  += ($bcyl1 & 0x300) >> 2;
+$bcyl1   &= 0xff;
+$ehead1   = $h-1;
+$esect1   = $s;
+$ecyl1   = $bcyl1;
+print "ehead1=$ehead1 esect1=$esect1 ecyl1=$ecyl1\n";
+
+if ( $opt{'fat'} == 1 ) {
+       $pentry = 2;
+}
+
 for ( $i = 1 ; $i <= 4 ; $i++ ) {
-    if ( $i == $pentry ) {
+    if ( $opt{'fat'} == 1 && $i == 1 ) {
+       $mbr .= pack("CCCCCCCCVV", 0x00, $bhead1, $bsect1, $bcyl1, 0xc,
+                    $ehead1, $esect1, $ecyl1, $offset+1, $psize1);
+    } elsif ( $i == $pentry ) {
 	$mbr .= pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
-		     $ehead, $esect, $ecyl, $offset, $psize);
+		     $ehead, $esect, $ecyl, $offset + 1, $psize);
     } else {
 	$mbr .= "\0" x 16;
     }
@@ -251,6 +273,18 @@
     print FILE "\0" x $padding;
 }
 
+# Create fat image and put it into the file
+if($opt{'fat'}) {
+    open(FATFILE, "> $file.fat") or die "$0: cannot open $file.fat: $!\n";
+    print FATFILE "\0" x ($psize1*512);
+    close(FATFILE);
+    system("/usr/sbin/mkfs.vfat -n RESIZE_ME $file.fat") and die "$0: cannot format fat\n";
+    open(FATFILE, "< $file.fat");
+    print FILE <FATFILE>;
+    close(FATFILE);
+    unlink("$file.fat");
+}
+
 # Done...
 close(FILE);
 
--- syslinux-5.00-orig/utils/isohybrid.in	2012-12-06 21:51:22.000000000 +0200
+++ syslinux-5.00/utils/isohybrid.in	2013-02-07 18:55:28.423760149 +0200
@@ -44,6 +44,7 @@
     'id'     => [0, 0xffffffff],
     'hd0'    => [0, 2],
     'partok' => [0, 1],
+    'fat'    => [0, 1],
 );
 
 # Boolean options just set other options
@@ -53,6 +54,7 @@
     'ctrlhd0'  => ['hd0', 2],
     'nopartok' => ['partok', 0],
     'partok'   => ['partok', 1],
+    'fatfirst' => ['fat', 1],
 );
 
 sub usage() {
@@ -66,7 +68,8 @@
     "  -id         Specify MBR ID (default random)\n",
     "  -forcehd0   Always assume we are loaded as disk ID 0\n",
     "  -ctrlhd0    Assume disk ID 0 if the Ctrl key is pressed\n",
-    "  -partok     Allow booting from within a partition\n";
+    "  -partok     Allow booting from within a partition\n",
+    "  -fatfirst   Create a small fat partition first\n";
     exit 1;
 }
 
@@ -221,9 +224,9 @@
 
 # Print partition table
 $offset  = $opt{'offset'};
-$psize   = $c*$h*$s - $offset;
+$psize   = $c*$h*$s - $offset - 1;
 $bhead   = int($offset/$s) % $h;
-$bsect   = ($offset % $s) + 1;
+$bsect   = ($offset % $s) + 1 + 1;
 $bcyl    = int($offset/($h*$s));
 $bsect  += ($bcyl & 0x300) >> 2;
 $bcyl   &= 0xff;
@@ -233,10 +236,29 @@
 $fstype  = $opt{'type'};	# Partition type
 $pentry  = $opt{'entry'};	# Partition slot
 
+$offset += $psize;
+$psize1   = $cylsize/512;
+$bhead1   = int(($offset+1)/$s) % $h;
+$bsect1   = (($offset+1) % $s) + 1;
+$bcyl1    = int(($offset+1)/($h*$s));
+$bsect1  += ($bcyl1 & 0x300) >> 2;
+$bcyl1   &= 0xff;
+$ehead1   = $h-1;
+$esect1   = $s;
+$ecyl1   = $bcyl1;
+print "ehead1=$ehead1 esect1=$esect1 ecyl1=$ecyl1\n";
+
+if ( $opt{'fat'} == 1 ) {
+	$pentry = 2;
+}
+
 for ( $i = 1 ; $i <= 4 ; $i++ ) {
-    if ( $i == $pentry ) {
+    if ( $opt{'fat'} == 1 && $i == 1 ) {
+	$mbr .= pack("CCCCCCCCVV", 0x00, $bhead1, $bsect1, $bcyl1, 0xc,
+		     $ehead1, $esect1, $ecyl1, $offset+1, $psize1);
+    } elsif ( $i == $pentry ) {
 	$mbr .= pack("CCCCCCCCVV", 0x80, $bhead, $bsect, $bcyl, $fstype,
-		     $ehead, $esect, $ecyl, $offset, $psize);
+		     $ehead, $esect, $ecyl, $offset + 1, $psize);
     } else {
 	$mbr .= "\0" x 16;
     }
@@ -251,6 +273,18 @@
     print FILE "\0" x $padding;
 }
 
+# Create fat image and put it into the file
+if($opt{'fat'}) {
+    open(FATFILE, "> $file.fat") or die "$0: cannot open $file.fat: $!\n";
+    print FATFILE "\0" x ($psize1*512);
+    close(FATFILE);
+    system("/usr/sbin/mkfs.vfat -n RESIZE_ME $file.fat") and die "$0: cannot format fat\n";
+    open(FATFILE, "< $file.fat");
+    print FILE <FATFILE>;
+    close(FATFILE);
+    unlink("$file.fat");
+}
+
 # Done...
 close(FILE);