Separate BSS section, cleared manually at runtime.

Makefile

@@ -11,7 +11,7 @@ config.mk: | config.default.mk
 	cp config.default.mk $@
 
 boot.bin: boot.elf
-	objcopy -O binary --only-section=.text boot.elf $@
+	objcopy -O binary -j .text -j .data boot.elf $@
 
 boot.elf: lboot.o loader.o fernlader.ld
 	$(LD) $(LDFLAGS) -o $@ lboot.o loader.o

fernlader.ld

@@ -6,9 +6,15 @@ SECTIONS {
     .text 0x7C00: {
         lboot.o(.text)
         *(.text, .rodata*)
+    } :all
+    .data : {
         *(.data)
-        *(.bss, COMMON)
         . = ALIGN(4K);
         lboot.o(.data.bootboot)
     } :all
+    _bss_start = .;
+    .bss (NOLOAD) : {
+        *(.bss, COMMON)
+    } :all
+    _bss_end = .;
 }

lboot.S

@@ -57,6 +57,12 @@ _start:     cli
             mov         %ax, %ds
             mov         %ax, %es
 
+            mov         $_bss_start, %di
+            mov         $_bss_end, %cx
+            sub         %di, %cx
+            xor         %al, %al
+            rep         stosb
+
             call        init_com1
 
             mov         $msg_start, %si
@@ -122,7 +128,7 @@ _start:     cli
 
             mov         $msg_long, %si
             call        print
-            jmp         hang // REMOVE ME
+            //jmp         hang // REMOVE ME
             call        long
 
             jmp         hang