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-rw-r--r--arch/x86/cpu/start.S9
1 files changed, 9 insertions, 0 deletions
diff --git a/arch/x86/cpu/start.S b/arch/x86/cpu/start.S
index e5c1733..313fa3f 100644
--- a/arch/x86/cpu/start.S
+++ b/arch/x86/cpu/start.S
@@ -128,6 +128,15 @@ car_init_ret:
andl $0xfffffff0, %esp
post_code(POST_START_STACK)
+ /*
+ * Debug UART is available here although it may not be plumbed out
+ * to pins depending on the board. To use it:
+ *
+ * call debug_uart_init
+ * mov $'a', %eax
+ * call printch
+ */
+
/* Zero the global data since it won't happen later */
xorl %eax, %eax
movl $GENERATED_GBL_DATA_SIZE, %ecx