diff --git a/arch/x86/core/early_serial.c b/arch/x86/core/early_serial.c
index 467267f1879..58613e25cce 100644
--- a/arch/x86/core/early_serial.c
+++ b/arch/x86/core/early_serial.c
@@ -60,6 +60,9 @@ static mm_reg_t mmio;
 #define FCR_XMITCLR BIT(2)  /* clear XMIT FIFO           */
 #define FCR_FIFO_1  0       /* 1 byte in RCVR FIFO       */
 
+static bool early_serial_init_done;
+static uint32_t suppressed_chars;
+
 static void serout(int c)
 {
 	while ((IN(REG_LSR) & LSR_THRE) == 0) {
@@ -69,6 +72,11 @@ static void serout(int c)
 
 int arch_printk_char_out(int c)
 {
+	if (!early_serial_init_done) {
+		suppressed_chars++;
+		return c;
+	}
+
 	if (c == '\n') {
 		serout('\r');
 	}
@@ -99,4 +107,11 @@ void z_x86_early_serial_init(void)
 
 	/* Turn on FIFO. Some hardware needs this before transmitting */
 	OUT(REG_FCR, FCR_FIFO | FCR_FIFO_1 | FCR_RCVRCLR | FCR_XMITCLR);
+
+	early_serial_init_done = true;
+
+	if (suppressed_chars) {
+		printk("WARNING: %u chars lost before early serial init\n",
+		       suppressed_chars);
+	}
 }