Index: kernel/arch/sparc64/src/drivers/sgcn.c
===================================================================
--- kernel/arch/sparc64/src/drivers/sgcn.c	(revision b60c582d0cf4f0476a720c8e05bd742fbffc87ce)
+++ kernel/arch/sparc64/src/drivers/sgcn.c	(revision cb01e1ee9f069d7d14148e3efc3cb37d1011b8de)
@@ -32,5 +32,5 @@
 /**
  * @file
- * @brief	SGCN driver.
+ * @brief SGCN driver.
  */
 
@@ -278,5 +278,5 @@
 			sgcn_do_putchar(ch);
 		} else
-			sgcn_do_putchar(invalch);
+			sgcn_do_putchar(U_SPECIAL);
 		
 		spinlock_unlock(&sgcn_output_lock);
Index: kernel/arch/sparc64/src/mm/page.c
===================================================================
--- kernel/arch/sparc64/src/mm/page.c	(revision b60c582d0cf4f0476a720c8e05bd742fbffc87ce)
+++ kernel/arch/sparc64/src/mm/page.c	(revision cb01e1ee9f069d7d14148e3efc3cb37d1011b8de)
@@ -54,10 +54,10 @@
  * We are currently using identity mapping for mapping device registers.
  *
- * @param physaddr	Physical address of the page where the device is
- * 			located.
- * @param size		Size of the device's registers. This argument is
- * 			ignored.
+ * @param physaddr Physical address of the page where the device is
+ *                 located.
+ * @param size     Size of the device's registers.
  *
- * @return		Virtual address of the page where the device is mapped.
+ * @return Virtual address of the page where the device is mapped.
+ *
  */
 uintptr_t hw_map(uintptr_t physaddr, size_t size)