[PATCH] M68k head comments

From: Geert Uytterhoeven <geert@linux-m68k.org>

M68k: Update some comments (from Roman Zippel)

arch/m68k/kernel/head.S

@@ -1250,9 +1250,9 @@ L(mmu_init_mac):
 	mmu_map		#VIDEOMEMBASE,%d0,#VIDEOMEMSIZE,%d3
 	/* The ROM starts at 4000 0000		    	*/
 	mmu_map_eq	#0x40000000,#0x02000000,%d3
-	/* IO devices                               	*/
+	/* IO devices (incl. serial port) from 5000 0000 to 5300 0000 */
 	mmu_map_eq	#0x50000000,#0x03000000,%d3
-	/* NuBus slot space				*/
+	/* Nubus slot space (video at 0xF0000000, rom at 0xF0F80000) */
 	mmu_map_tt	#1,#0xf8000000,#0x08000000,%d3
 
 	jbra	L(mmu_init_done)
@@ -1891,7 +1891,7 @@ mmu_030_print:
 	movel	%a4,%d5
 	addil	#PAGESIZE<<13,%d5
 	movel	%a0@+,%d6
-	btst	#1,%d6			/* is it a ptr? */
+	btst	#1,%d6			/* is it a table ptr? */
 	jbne	31f			/* yes */
 	btst	#0,%d6			/* is it early terminating? */
 	jbeq	1f			/* no */
@@ -1908,9 +1908,9 @@ mmu_030_print:
 	movel	%a4,%d5
 	addil	#PAGESIZE<<6,%d5
 	movel	%a1@+,%d6
-	btst	#1,%d6
-	jbne	33f
-	btst	#0,%d6
+	btst	#1,%d6			/* is it a table ptr? */
+	jbne	33f			/* yes */
+	btst	#0,%d6			/* is it a page descriptor? */
 	jbeq	1f			/* no */
 	jbsr	mmu_030_print_helper
 	jbra	37f
@@ -3154,7 +3154,7 @@ func_start	serial_putc,%d0/%d1/%a0/%a1
 	moveml	%sp@+,%d0-%d7/%a2-%a6
 	jbra	L(serial_putc_done)
 2:
-#endif CONFIG_MVME16x
+#endif /* CONFIG_MVME16x */
 
 #ifdef CONFIG_BVME6000
 	is_not_bvme6000(2f)
@@ -3369,10 +3369,10 @@ L(console_clear_loop):
 
 	/*
 	 *	At this point we make a shift in register usage
-	 *	a1 = address of Lconsole_font pointer
+	 *	a1 = address of console_font pointer
 	 */
 	lea	%pc@(L(console_font)),%a1
-	movel	%a0,%a1@	/* store pointer to struct font_desc in Lconsole_font */
+	movel	%a0,%a1@	/* store pointer to struct fbcon_font_desc in console_font */
 	tstl	%a0
 	jeq	1f
 
@@ -3383,10 +3383,10 @@ L(console_clear_loop):
 	 *	6 x 11 also supported
 	 */
 		/* ASSERT: a0 = contents of Lconsole_font */
-	movel	%d3,%d0			/* screen width in pixels */
-	divul	%a0@(FONT_DESC_WIDTH),%d0		/* d0 = max num chars per row */
+	movel	%d3,%d0				/* screen width in pixels */
+	divul	%a0@(FONT_DESC_WIDTH),%d0	/* d0 = max num chars per row */
 
-	movel	%d4,%d1			 /* screen height in pixels */
+	movel	%d4,%d1				 /* screen height in pixels */
 	divul	%a0@(FONT_DESC_HEIGHT),%d1	 /* d1 = max num rows */
 
 	movel	%d0,%a2@(Lconsole_struct_num_columns)