added comment

set fastram end before start of RAM BaS

BaS_gcc/sources/BaS.c

@@ -215,8 +215,10 @@ void BaS(void)
 	vec_init();
 	xprintf("finished\r\n");
 
+	xprintf("enable MMU: ");
 	MCF_MMU_MMUCR = MCF_MMU_MMUCR_EN;	/* MMU on */
 	NOP();								/* force pipeline sync */
+	xprintf("finished\r\n");
 
 	xprintf("IDE reset: ");
 	/* IDE reset */
@@ -276,6 +278,7 @@ void BaS(void)
 	/* TT-RAM */
 
 	* (uint32_t *) 0x5a4 = FASTRAM_END;	/* ramtop TOS system variable */
+	* (uint32_t *) 0x5a4 = 0x1d000000;
 	* (uint32_t *) 0x5a8 = 0x1357bd13;	/* ramvalid TOS system variable */
 
 	xprintf("init ACIA: ");