The leon3 board is looking for u-boot.bin by default (LEON3_PROM_FILENAME)..
But in the case this file is not found and no other file are given on the
command line we get the following error:

  $ ./qemu-system-sparc -M leon3_generic
  qemu-system-sparc: Can't read bios image (null)

So use LEON3_PROM_FILENAME instead of filename in case it is NULL to get a
less cryptic message:

  $ ./qemu-system-sparc -M leon3_generic
  qemu-system-sparc: Can't read bios image 'u-boot.bin'

Suggested-by: Mark Cave-Ayland <mark.cave-ayl...@ilande.co.uk>
Signed-off-by: KONRAD Frederic <frederic.kon...@adacore.com>
---
 hw/sparc/leon3.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/hw/sparc/leon3.c b/hw/sparc/leon3.c
index 0383b17..f438718 100644
--- a/hw/sparc/leon3.c
+++ b/hw/sparc/leon3.c
@@ -1,7 +1,7 @@
 /*
  * QEMU Leon3 System Emulator
  *
- * Copyright (c) 2010-2011 AdaCore
+ * Copyright (c) 2010-2019 AdaCore
  *
  * Permission is hereby granted, free of charge, to any person obtaining a copy
  * of this software and associated documentation files (the "Software"), to 
deal
@@ -43,7 +43,7 @@
 /* Default system clock.  */
 #define CPU_CLK (40 * 1000 * 1000)
 
-#define PROM_FILENAME        "u-boot.bin"
+#define LEON3_PROM_FILENAME "u-boot.bin"
 
 #define MAX_PILS 16
 
@@ -158,7 +158,7 @@ static void leon3_generic_hw_init(MachineState *machine)
 
     /* Load boot prom */
     if (bios_name == NULL) {
-        bios_name = PROM_FILENAME;
+        bios_name = LEON3_PROM_FILENAME;
     }
     filename = qemu_find_file(QEMU_FILE_TYPE_BIOS, bios_name);
 
@@ -180,7 +180,9 @@ static void leon3_generic_hw_init(MachineState *machine)
             exit(1);
         }
     } else if (kernel_filename == NULL && !qtest_enabled()) {
-        error_report("Can't read bios image %s", filename);
+        error_report("Can't read bios image '%s'", filename
+                                                   ? filename
+                                                   : LEON3_PROM_FILENAME);
         exit(1);
     }
     g_free(filename);
-- 
1.8.3.1


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