redesign of the SCC bootloader

tools/scc_setup.asm

@@ -28,53 +28,11 @@ _start:
 
 	msg db "?ello from MetalSVM bootloader!!",0
 
-enable_A20:
-	call    a20wait
-	mov     al,0xAD
-	out     0x64,al
- 
-	call    a20wait
-	mov     al,0xD0
-	out     0x64,al
- 
-	call    a20wait2
-	in      al,0x60
-	push    eax
- 
-	call    a20wait
-	mov     al,0xD1
-	out     0x64,al
- 
-	call    a20wait
-	pop     eax
-	or      al,2
-	out     0x60,al
-
-	call    a20wait
-	mov     al,0xAE
-	out     0x64,al
- 
-	call    a20wait
-	ret
- 
-a20wait:
-	in      al,0x64
-	test    al,2	
-	jnz     a20wait
-	ret
- 
-a20wait2:
-	in      al,0x64
-	test    al,1
-	jz      a20wait2
-	ret
-
 _realstart:
 	; IRQs are already disabled by reset_vector
 	; cli 
 
 	lgdt [gdtr]
-	; call enable_A20
 
 	; switch to protected mode by setting PE bit
 	mov eax, cr0