diff --git a/brick/uf2daemon/fat.c b/brick/uf2daemon/fat.c
index 5d794f02..994a645e 100644
--- a/brick/uf2daemon/fat.c
+++ b/brick/uf2daemon/fat.c
@@ -36,7 +36,7 @@
 
 #include "uf2.h"
 
-#define DBG printf
+#define DBG LOG
 
 typedef struct {
     uint8_t JumpInstruction[3];
@@ -592,6 +592,7 @@ void readBlock(uint8_t *dest, int blkno) {
             if (fd >= 0) {
                 lseek(fd, bl->targetAddr, SEEK_SET);
                 bl->payloadSize = read(fd, bl->data, 256);
+                close(fd);
             } else {
                 bl->payloadSize = -1;
             }
diff --git a/brick/uf2daemon/main.c b/brick/uf2daemon/main.c
index a8aba234..1016a245 100644
--- a/brick/uf2daemon/main.c
+++ b/brick/uf2daemon/main.c
@@ -21,20 +21,9 @@
 
 #define NUM_BLOCKS NUM_FAT_BLOCKS
 
-#define FAIL(args...)                                                                              \
-    do {                                                                                           \
-        fprintf(stderr, args);                                                                     \
-        fprintf(stderr, "\n");                                                                     \
-        exit(1);                                                                                   \
-    } while (0)
-
-#define LOG(args...)                                                                               \
-    do {                                                                                           \
-        fprintf(stderr, args);                                                                     \
-        fprintf(stderr, "\n");                                                                     \
-    } while (0)
-
-uint64_t ntohll(uint64_t a) { return ((uint64_t)ntohl(a & 0xffffffff) << 32) | ntohl(a >> 32); }
+uint64_t ntohll(uint64_t a) {
+    return ((uint64_t)ntohl(a & 0xffffffff) << 32) | ntohl(a >> 32);
+}
 #define htonll ntohll
 
 void readAll(int fd, void *dst, uint32_t length) {
@@ -82,9 +71,8 @@ void startclient() {
 
 void handleread(int off, int len) {
     uint8_t buf[512];
-    // fprintf(stderr, "read @%d len=%d\n", off, len);
-    //  htonl(EPERM);
-    reply.error = 0;
+    LOG("read @%d len=%d", off, len);
+    reply.error = 0; //  htonl(EPERM);
     writeAll(sock, &reply, sizeof(struct nbd_reply));
     for (int i = 0; i < len; ++i) {
         read_block(off + i, buf);
@@ -94,7 +82,7 @@ void handleread(int off, int len) {
 
 void handlewrite(int off, int len) {
     uint8_t buf[512];
-    // fprintf(stderr, "write @%d len=%d\n", off, len);
+    LOG("write @%d len=%d", off, len);
     for (int i = 0; i < len; ++i) {
         readAll(sock, buf, 512);
         write_block(off + i, buf);
diff --git a/brick/uf2daemon/uf2.h b/brick/uf2daemon/uf2.h
index 53e5336f..168ce081 100644
--- a/brick/uf2daemon/uf2.h
+++ b/brick/uf2daemon/uf2.h
@@ -34,4 +34,20 @@ void readAll(int fd, void *dst, uint32_t length);
 
 STATIC_ASSERT(sizeof(UF2_Block) == 512);
 
+
+#define FAIL(args...)                                                                              \
+    do {                                                                                           \
+        fprintf(stderr, args);                                                                     \
+        fprintf(stderr, "\n");                                                                     \
+        exit(1);                                                                                   \
+    } while (0)
+
+#define LOG(args...)                                                                               \
+    do {                                                                                           \
+        fprintf(stderr, args);                                                                     \
+        fprintf(stderr, "\n");                                                                     \
+        fflush(stderr);                                                                            \
+    } while (0)
+
+
 #endif