diff --git a/firmware/target/arm/ata-nand-telechips.c b/firmware/target/arm/ata-nand-telechips.c
index 5401f0d3ab..ceabf96169 100644
--- a/firmware/target/arm/ata-nand-telechips.c
+++ b/firmware/target/arm/ata-nand-telechips.c
@@ -40,6 +40,9 @@ long last_disk_activity = -1;
 /** static, private data **/
 static bool initialized = false;
 
+static long next_yield = 0;
+#define MIN_YIELD_PERIOD 1000
+
 static struct mutex ata_mtx SHAREDBSS_ATTR;
 
 #if defined(COWON_D2) || defined(IAUDIO_7)
@@ -714,6 +717,14 @@ int nand_read_sectors(IF_MV2(int drive,) unsigned long start, int incount,
                 return -1;
             }
 
+#ifdef CPU_TCC780X /* 77x doesn't have USEC_TIMER yet */
+            if (TIME_AFTER(USEC_TIMER, next_yield))
+            {
+                next_yield = USEC_TIMER + MIN_YIELD_PERIOD;
+                yield();
+            }
+#endif
+
             inbuf += SECTOR_SIZE;
             incount--;
             secmod++;