diff --git a/rtlplayground.c b/rtlplayground.c
index 041c7ed..01a1fc6 100644
--- a/rtlplayground.c
+++ b/rtlplayground.c
@@ -811,7 +811,7 @@ void sds_config(uint8_t sds, uint8_t mode)
 	if (mode != SDS_QXGMII)
 		sds_write_v(sds, 0x06, 0x1f, 0x2100); // Q00061f:2100
 
-	if (sds == 0 && mode == SDS_1000BX_FIBER) {
+	if (mode == SDS_1000BX_FIBER) {
 		sds_write_v(sds, 0x02, 0x04, 0x0020); 	// Q000204:0020
 		sds_write_v(sds, 0x00, 0x02, 0x73d0); 	// Q000002:73d0
 		sds_write_v(sds, 0x00, 0x04, 0x074d); 	// Q000004:074d
diff --git a/tools/imagebuilder.c b/tools/imagebuilder.c
index 53beaca..0d52345 100644
--- a/tools/imagebuilder.c
+++ b/tools/imagebuilder.c
@@ -112,8 +112,8 @@ int main(int argc, char **argv)
 	}
 	for (int b = BANK0_SIZE; b < BANK_STRIDE + BANK0_SIZE; b ++) {
 		if (buffer[b]) {
-			printf("WARNING: Bank 0: code segment too large at 0x%x!\n", b);
-			break;
+			printf("Error: Bank 0: code segment too large at 0x%x!\n", b);
+			return 5;
 		}
 	}
 	for (int bank = 1; bank <= nbanks; bank++) {