updates and unifies linkerscript

env/ehrenberg/ram.lds

@@ -118,10 +118,18 @@ SECTIONS
 
   .data          :
   {
+    __DATA_BEGIN__ = .;
     *(.data .data.*)
     *(.gnu.linkonce.d.*)
   } >ram AT>rom :ram_init
 
+  .sdata          :
+  {
+    __SDATA_BEGIN__ = .;
+    *(.sdata .sdata.*)
+    *(.gnu.linkonce.s.*)
+  } >ram AT>rom :ram_init
+
   .srodata        :
   {
     PROVIDE( __global_pointer$ = . + 0x800 );
@@ -132,12 +140,6 @@ SECTIONS
     *(.srodata .srodata.*)
   } >ram AT>rom :ram_init
 
-  .sdata          :
-  {
-    *(.sdata .sdata.*)
-    *(.gnu.linkonce.s.*)
-  } >ram AT>rom :ram_init
-
   . = ALIGN(4);
   PROVIDE( _edata = . );
   PROVIDE( edata = . );
@@ -155,6 +157,7 @@ SECTIONS
   } >ram AT>ram :ram
 
   . = ALIGN(8);
+  __BSS_END__ = .;
   PROVIDE( _end = . );
   PROVIDE( end = . );
 
@@ -164,4 +167,7 @@ SECTIONS
     . = __stack_size;
     PROVIDE( _sp = . );
   } >ram AT>ram :ram
+
+  PROVIDE( tohost = 0xfffffff0 );
+  PROVIDE( fromhost = 0xfffffff8 );
 }