diff -drupN a/tools/pm-sleep/uart.c b/tools/pm-sleep/uart.c
--- a/tools/pm-sleep/uart.c	1970-01-01 03:00:00.000000000 +0300
+++ b/tools/pm-sleep/uart.c	2022-06-09 05:02:37.000000000 +0300
@@ -0,0 +1,60 @@
+#include <common.h>
+#include <uart.h>
+#include <cpm.h>
+
+void udelay(int d)
+{
+	do{
+		__asm__ __volatile__ ("nop \n\t");
+		d -= (1000 + 23)/ 24 * 2;
+	}while(d > 0);
+
+}
+
+#ifdef DEBUG
+
+#define OFF_TDR         (0x00)
+#define OFF_LCR         (0x0C)
+#define OFF_LSR         (0x14)
+
+#define LSR_TDRQ        (1 << 5)
+#define LSR_TEMT        (1 << 6)
+
+static unsigned int U_IOBASE = (0x10030000 + 0xa0000000);
+static unsigned int U_ADDR = 0;
+void serial_setid(int uart_id)
+{
+	if(uart_id != 0xff)
+		U_ADDR = U_IOBASE + uart_id * 0x1000;
+	else
+		U_ADDR = 0;
+}
+void serial_putc(char x)
+{
+	if(U_ADDR){
+		REG32(U_ADDR + OFF_TDR) = x;
+		while ((REG32(U_ADDR + OFF_LSR) & (LSR_TDRQ | LSR_TEMT)) != (LSR_TDRQ | LSR_TEMT));
+	}
+}
+void serial_put_hex(unsigned int x)
+{
+	int i;
+	unsigned int d;
+	for(i = 7;i >= 0;i--) {
+		d = (x  >> (i * 4)) & 0xf;
+		if(d < 10) d += '0';
+		else d += 'A' - 10;
+		serial_putc(d);
+	}
+}
+#else
+void serial_setid(int uart_id)
+{
+}
+void serial_putc(char x)
+{
+}
+void serial_put_hex(unsigned int x)
+{
+}
+#endif