diff --git a/litex/soc/software/bios/Makefile b/litex/soc/software/bios/Makefile
index b5be87133..59fa03bd4 100644
--- a/litex/soc/software/bios/Makefile
+++ b/litex/soc/software/bios/Makefile
@@ -1,7 +1,7 @@
 include ../include/generated/variables.mak
 include $(SOC_DIRECTORY)/software/common.mak
 
-OBJECTS=isr.o sdram.o main.o boot-helper-$(CPU).o boot.o dataflow.o
+OBJECTS=isr.o sdram.o main.o boot-helper-$(CPU).o boot.o
 
 all: bios.bin
 
diff --git a/litex/soc/software/bios/dataflow.c b/litex/soc/software/bios/dataflow.c
deleted file mode 100644
index d9aaa6ab2..000000000
--- a/litex/soc/software/bios/dataflow.c
+++ /dev/null
@@ -1,42 +0,0 @@
-#include <stdio.h>
-
-#include "dataflow.h"
-
-void print_isd_info(unsigned int baseaddr)
-{
-	volatile unsigned int *regs;
-	int neps;
-	int nbytes;
-	int i, j;
-	int offset;
-	unsigned int ack_count, nack_count, cur_status;
-	
-	regs = (unsigned int *)baseaddr;
-	if((regs[0] != 0x6a) || (regs[1] != 0xb4)) {
-		printf("Incorrect magic number\n");
-		return;
-	}
-	neps = regs[2];
-	nbytes = (regs[3] + 7)/8;
-	
-	regs[4] = 1; // freeze
-	offset = 6; // regs[5] is reset
-	for(i=0;i<neps;i++) {
-		ack_count = 0;
-		for(j=0;j<nbytes;j++) {
-			ack_count <<= 8;
-			ack_count |= regs[offset++];
-		}
-		nack_count = 0;
-		for(j=0;j<nbytes;j++) {
-			nack_count <<= 8;
-			nack_count |= regs[offset++];
-		}
-		cur_status = regs[offset++];
-		printf("#%d: ACK_CNT:%10u   NAK_CNT:%10u %s %s\n",
-			i, ack_count, nack_count,
-			cur_status & 1 ? "stb" : "   ",
-			cur_status & 2 ? "ack" : "   ");
-	}
-	regs[4] = 0; // unfreeze
-}
diff --git a/litex/soc/software/bios/dataflow.h b/litex/soc/software/bios/dataflow.h
deleted file mode 100644
index 965983070..000000000
--- a/litex/soc/software/bios/dataflow.h
+++ /dev/null
@@ -1,7 +0,0 @@
-#ifndef __DATAFLOW_H
-#define __DATAFLOW_H
-
-void print_isd_info(unsigned int baseaddr);
-
-#endif /* __DATAFLOW_H */
-