Cleanup the comment for m68k linux boot argument passing.

This patch clarifies the way m68k passes linux boot argument.
The one gotcha here is that the assembly instruction that
the compiler uses to jump to the kernel is 'jsr' which pushes the
program counter for the instruction after the jsr into the stack pointer.

Signed-off-by: Richard Retanubun <RichardRetanubun@RuggedCom.com>
Signed-off-by: Wolfgang Denk <wd@denx.de>

lib_m68k/bootm.c

@@ -111,11 +111,12 @@ int do_bootm_linux(int flag, int argc, char *argv[], bootm_headers_t *images)
 
 	/*
 	 * Linux Kernel Parameters (passing board info data):
-	 *   r3: ptr to board info data
-	 *   r4: initrd_start or 0 if no initrd
-	 *   r5: initrd_end - unused if r4 is 0
-	 *   r6: Start of command line string
-	 *   r7: End   of command line string
+	 *   sp+00: Ignore, side effect of using jsr to jump to kernel
+	 *   sp+04: ptr to board info data
+	 *   sp+08: initrd_start or 0 if no initrd
+	 *   sp+12: initrd_end - unused if initrd_start is 0
+	 *   sp+16: Start of command line string
+	 *   sp+20: End   of command line string
 	 */
 	(*kernel) (kbd, initrd_start, initrd_end, cmd_start, cmd_end);
 	/* does not return */