diff --git a/hardware/esp8266com/esp8266/bootloaders/eboot/Makefile b/hardware/esp8266com/esp8266/bootloaders/eboot/Makefile
index 8aaac9cab..cd9e14143 100644
--- a/hardware/esp8266com/esp8266/bootloaders/eboot/Makefile
+++ b/hardware/esp8266com/esp8266/bootloaders/eboot/Makefile
@@ -18,7 +18,7 @@ OBJDUMP := $(XTENSA_TOOCHAIN)xtensa-lx106-elf-objdump
 
 CFLAGS += -std=gnu99
 
-CFLAGS += -Os -g -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mno-text-section-literals
+CFLAGS += -O0 -g -Wpointer-arith -Wno-implicit-function-declaration -Wl,-EL -fno-inline-functions -nostdlib -mlongcalls -mno-text-section-literals
 
 LDFLAGS	+= -nostdlib -Wl,--no-check-sections -umain
 
diff --git a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.c b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.c
index 86a27eff0..b3193e299 100644
--- a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.c
+++ b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.c
@@ -150,7 +150,7 @@ int copy_raw(const uint32_t src_addr,
 
 void main()
 {
-    int res;
+    int res = 9;
     struct eboot_command cmd;
 
     eboot_command_read(&cmd);
diff --git a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.elf b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.elf
index b7908dfd6..0637a0525 100755
Binary files a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.elf and b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.elf differ
diff --git a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.ld b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.ld
index 0b9250dea..303ae8a56 100644
--- a/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.ld
+++ b/hardware/esp8266com/esp8266/bootloaders/eboot/eboot.ld
@@ -4,7 +4,7 @@ MEMORY
 {
   dport0_0_seg :                      	org = 0x3FF00000, len = 0x10
   dram0_0_seg :                       	org = 0x3FFE8000, len = 0x14000
-  iram1_0_seg :                       	org = 0x4010f800, len = 0x800
+  iram1_0_seg :                       	org = 0x4010f000, len = 0x1000
   irom0_0_seg :                       	org = 0x40240000, len = 0x32000
 }