pebble/third_party/jerryscript/targets/esp8266/docs/ESP-PATCHFORJERRYSCRIPT.md

Apply patch to ESP8266 SDK

As iram is quite small to fit all the codes but linker tries to put it there. To force JerryScript codes to be placed at the irom section, need to change the order and tell the linker as below;

diff --git a/ld/eagle.app.v6.common.ld b/ld/eagle.app.v6.common.ld
index caf8e32..dadaceb 100644
--- a/ld/eagle.app.v6.common.ld
+++ b/ld/eagle.app.v6.common.ld
@@ -151,6 +151,21 @@ SECTIONS
   } >dram0_0_seg :dram0_0_bss_phdr
 /* __stack = 0x3ffc8000; */
 
+  .irom0.text : ALIGN(4)
+  {
+    _irom0_text_start = ABSOLUTE(.);
+    *(.irom0.literal .irom.literal .irom.text.literal .irom0.text .irom.text)
+    *(.literal.* .text.*)
+    _irom0_text_end = ABSOLUTE(.);
+
+    _jerry_text_start = ABSOLUTE(.);
+    *\libjerryentry.a:*(.text*)
+    *\libjerrycore.a:*(.text*)
+    *\libjerrylibm.a:*(.text*)
+    _jerry_text_end = ABSOLUTE(.);
+
+  } >irom0_0_seg :irom0_0_phdr
+
   .text : ALIGN(4)
   {
     _stext = .;
@@ -199,13 +214,6 @@ SECTIONS
     _lit4_end = ABSOLUTE(.);
   } >iram1_0_seg :iram1_0_phdr
 
-  .irom0.text : ALIGN(4)
-  {
-    _irom0_text_start = ABSOLUTE(.);
-    *(.irom0.literal .irom.literal .irom.text.literal .irom0.text .irom.text)
-    *(.literal.* .text.*)
-    _irom0_text_end = ABSOLUTE(.);
-  } >irom0_0_seg :irom0_0_phdr
 }
 
 /* get ROM code address */
diff --git a/ld/eagle.app.v6.ld b/ld/eagle.app.v6.ld
index 3e7ec1b..4a9ab5b 100644
--- a/ld/eagle.app.v6.ld
+++ b/ld/eagle.app.v6.ld
@@ -26,7 +26,7 @@ MEMORY
   dport0_0_seg :                       org = 0x3FF00000, len = 0x10
   dram0_0_seg :                        org = 0x3FFE8000, len = 0x14000
   iram1_0_seg :                        org = 0x40100000, len = 0x8000
-  irom0_0_seg :                        org = 0x40240000, len = 0x3C000
+  irom0_0_seg :                        org = 0x40240000, len = 0xB0000
 }
 
 INCLUDE "../ld/eagle.app.v6.common.ld"

Second file is to modify irom size so that it can hold all the codes and data. This can be done by giving another SPI_SIZE_MAP. For now, I'll use this manual modification.

Need to get setjmp / longjmp

Extract and copy from the SDK.

cd ~/harmony/jerryscript/targets/esp8266/libs
ar -xv $SDK_PATH/lib/libcirom.a lib_a-setjmp.o