From 09003055e48d17f88725152c2922a49162959d4f Mon Sep 17 00:00:00 2001
From: Josh Felmeden <josh.felmeden@capgemini.com>
Date: Fri, 19 Jan 2024 15:26:41 +0000
Subject: [PATCH] ensure FIFO has space before transmit

Signed-off-by: Josh Felmeden <josh.felmeden@capgemini.com>
---
 loader/src/loader.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/loader/src/loader.c b/loader/src/loader.c
index 440db8df..72750c0f 100644
--- a/loader/src/loader.c
+++ b/loader/src/loader.c
@@ -152,9 +152,14 @@ putc(uint8_t ch)
 static void
 putc(uint8_t ch)
 {
-    while (!(*UART_REG(STAT) & STAT_TDRE)) { }
-    if (ch == '\n')
+    if (ch == '\n') {
+        // ensure FIFO has space
+        while (!(*UART_REG(STAT) & STAT_TDRE)) { }
         *UART_REG(TRANSMIT) = '\r';
+    }     
+    
+    // ensure FIFO has space
+    while (!(*UART_REG(STAT) & STAT_TDRE)) { }
     *UART_REG(TRANSMIT) = ch;
 }
 #else