Index: firmware/target/arm/system-pp502x.c
===================================================================
--- firmware/target/arm/system-pp502x.c	(revision 31026)
+++ firmware/target/arm/system-pp502x.c	(working copy)
@@ -209,6 +209,12 @@
     GPIOL_INT_EN        = 0;
 }
 
+static void ICODE_ATTR cpucache_fill(void) {
+    register volatile char *p;
+    for (p = (volatile char *)0; p < (volatile char *)0x2000; p += 0x10)
+        (void)*p;
+}
+
 void ICODE_ATTR cpucache_commit(void)
 {
     if (CACHE_CTL & CACHE_CTL_ENABLE)
@@ -228,6 +234,7 @@
         while ((CACHE_CTL & CACHE_CTL_BUSY) != 0);
         nop; nop; nop; nop;
     }
+    cpucache_fill();
 }
 void cpucache_invalidate(void) __attribute__((alias("cpucache_commit_discard")));
 
@@ -257,6 +264,7 @@
     /* enable cache */
     CACHE_CTL |= CACHE_CTL_INIT | CACHE_CTL_ENABLE | CACHE_CTL_RUN;
     nop; nop; nop; nop;
+    cpucache_fill();
 }
 #endif /* BOOTLOADER || HAVE_BOOTLOADER_USB_MODE */