diff --git a/avr/devices/t03/boot/boot.asm b/avr/devices/t03/boot/boot.asm
index 1a83579..37a7147 100644
--- a/avr/devices/t03/boot/boot.asm
+++ b/avr/devices/t03/boot/boot.asm
@@ -131,6 +131,7 @@ main:
 .include "modules/flash/eeprom.asm"
 .include "modules/flash/io.asm"
 .include "modules/flash/io_uart1.asm"
+.include "modules/flash/io_uart_all.asm"
 .include "modules/flash/flashxp.asm"
 .include "modules/flash/flash4p.asm"
 .include "modules/flash/flashprocess.asm"
diff --git a/avr/devices/t03/defs.asm b/avr/devices/t03/defs.asm
index 2b6374a..75a19f4 100644
--- a/avr/devices/t03/defs.asm
+++ b/avr/devices/t03/defs.asm
@@ -77,4 +77,9 @@
 .equ OWI_PINNUM  = PORTA7
 
 
+; ---------------------------------------------------------------------------
+; ComOnUart module
+
+.equ  USART0_DATAREG   = UDR0
+.equ  USART1_DATAREG   = UDR1