--- qemu/roms/seabios/src/output.c	2018/04/24 18:27:31	1.1.1.3
+++ qemu/roms/seabios/src/output.c	2018/04/24 19:24:01	1.1.1.5
@@ -21,7 +21,6 @@ struct putcinfo {
  * Debug output
  ****************************************************************/
 
-#define DEBUG_PORT PORT_SERIAL1
 #define DEBUG_TIMEOUT 100000
 
 void
@@ -31,12 +30,12 @@ debug_serial_setup(void)
         return;
     // setup for serial logging: 8N1
     u8 oldparam, newparam = 0x03;
-    oldparam = inb(DEBUG_PORT+SEROFF_LCR);
-    outb(newparam, DEBUG_PORT+SEROFF_LCR);
+    oldparam = inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LCR);
+    outb(newparam, CONFIG_DEBUG_SERIAL_PORT+SEROFF_LCR);
     // Disable irqs
     u8 oldier, newier = 0;
-    oldier = inb(DEBUG_PORT+SEROFF_IER);
-    outb(newier, DEBUG_PORT+SEROFF_IER);
+    oldier = inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_IER);
+    outb(newier, CONFIG_DEBUG_SERIAL_PORT+SEROFF_IER);
 
     if (oldparam != newparam || oldier != newier)
         dprintf(1, "Changing serial settings was %x/%x now %x/%x\n"
@@ -50,11 +49,11 @@ debug_serial(char c)
     if (!CONFIG_DEBUG_SERIAL)
         return;
     int timeout = DEBUG_TIMEOUT;
-    while ((inb(DEBUG_PORT+SEROFF_LSR) & 0x60) != 0x60)
+    while ((inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LSR) & 0x20) != 0x20)
         if (!timeout--)
             // Ran out of time.
             return;
-    outb(c, DEBUG_PORT+SEROFF_DATA);
+    outb(c, CONFIG_DEBUG_SERIAL_PORT+SEROFF_DATA);
 }
 
 // Make sure all serial port writes have been completely sent.
@@ -64,7 +63,7 @@ debug_serial_flush(void)
     if (!CONFIG_DEBUG_SERIAL)
         return;
     int timeout = DEBUG_TIMEOUT;
-    while ((inb(DEBUG_PORT+SEROFF_LSR) & 0x40) != 0x40)
+    while ((inb(CONFIG_DEBUG_SERIAL_PORT+SEROFF_LSR) & 0x60) != 0x60)
         if (!timeout--)
             // Ran out of time.
             return;
@@ -116,7 +115,7 @@ screenc(char c)
 static void
 putc_screen(struct putcinfo *action, char c)
 {
-    if (CONFIG_SCREEN_AND_DEBUG)
+    if (ScreenAndDebug)
         putc_debug(&debuginfo, c);
     if (c == '\n')
         screenc('\r');
@@ -148,6 +147,8 @@ putc(struct putcinfo *action, char c)
 static void
 puts(struct putcinfo *action, const char *s)
 {
+    if (!MODESEGMENT && !s)
+        s = "(NULL)";
     for (; *s; s++)
         putc(action, *s);
 }
@@ -362,7 +363,7 @@ printf(const char *fmt, ...)
     va_start(args, fmt);
     bvprintf(&screeninfo, fmt, args);
     va_end(args);
-    if (CONFIG_SCREEN_AND_DEBUG)
+    if (ScreenAndDebug)
         debug_serial_flush();
 }
 
@@ -407,6 +408,30 @@ snprintf(char *str, size_t size, const c
     return end - str;
 }
 
+// Build a formatted string - malloc'ing the memory.
+char *
+znprintf(size_t size, const char *fmt, ...)
+{
+    ASSERT32FLAT();
+    if (!size)
+        return NULL;
+    char *str = malloc_tmp(size);
+    if (!str) {
+        warn_noalloc();
+        return NULL;
+    }
+    struct snprintfinfo sinfo = { { putc_str }, str, str + size };
+    va_list args;
+    va_start(args, fmt);
+    bvprintf(&sinfo.info, fmt, args);
+    va_end(args);
+    char *end = sinfo.str;
+    if (end >= sinfo.end)
+        end = sinfo.end - 1;
+    *end = '\0';
+    return str;
+}
+
 
 /****************************************************************
  * Misc helpers