How to load ELF image build by Arduino using Non-OS SDK bootloader

[gailu]

Hi Espressif Team,

I have a requirement where I need to use elf image built using Arduino IDE but with boot_v1.6.bin provided in the NonOS SDK. I performed following steps

Background:
1. Arduino builds 2 elf files (sketch elf file and eboot elf file) then uses elf2bin.py (https://github.com/esp8266/Arduino/blob ... elf2bin.py) to stitch single binary that can be flashed on address 0x0. As we want to use SDK boot loader so we skipped eboot.elf file. and used only sketch elf file to follow NONOS SDK process to create a bin file.

My Sketch Elf File Name: hello.ino.elf

Step 1: Run objcopy command to generate following files as per Make file rules

Code: Select all

xtensa-lx106-elf-objcopy.exe --only-section .text -O binary hello.ino.elf eagle.app.v6.text.bin
xtensa-lx106-elf-objcopy.exe --only-section .data -O binary hello.ino.elf eagle.app.v6.data.bin
xtensa-lx106-elf-objcopy.exe --only-section .rodata -O binary hello.ino.elf eagle.app.v6.rodata.bin
xtensa-lx106-elf-objcopy.exe --only-section .irom0.text -O binary hello.ino.elf eagle.app.v6.irom0text.bin


Step2: Run gen_appbin.py to create binary file eagle.app.flash.bin

Code: Select all

tools\gen_appbin.py hello.ino.elf 1 2 0 4 1


Step3: Flashed following binaries on ESP12 F using ESP Download Tool

Code: Select all

boot_v1.6.bin:             0x00000;
eagle.app.flash.bin:       0x01000;
esp_init_data_default.bin: 0x3FC000;
blank.bin:                 0x3FE000;


Run the board. But it did not work (no output on console except for some junk). As the sketch is nothing but a C++ code, I believe it should have worked. Can you please guide me.

I am attaching source File, elf file and linker script used to create elf file for sketch.

[gailu]

I see one major difference in the linker script between SDK and Arduino. In case of nonos SDK, IRAM has only one segment (.text) whereas Arduino splits IRAM in to two segment .text and .text1.

Do I need to do objcopy for .text1 as I am doing for .text segment? If Yes, How to I use it in gen_appbin.py, does that script need to be updated?

[gailu]

I now changed objcopy command to include both sections (.text and .text1) as follows

from

Code: Select all

xtensa-lx106-elf-objcopy.exe --only-section .text -O binary hello.ino.elf eagle.app.v6.text.bin

to

Code: Select all

xtensa-lx106-elf-objcopy.exe --only-section .text* -O binary hello.ino.elf eagle.app.v6.text.bin

But still no success. From Theoretical point of view it should work but I believe something else is also missing.

Any pointer will help to get it working

[gailu]

Hi ESP_Faye, ESP_wujiangang and ESP_Deng Xin

Any idea why standard bootloader provided in SDK can not boot an elf file converted to bin file with the standard nonos sdk procedure?

Where is the limitation?

[Her Mary]

I thought nonOS was kind of EoF.. Not sure.. Could this help? https://github.com/espressif/ESP8266_NO ... r/Makefile

[gailu]

Thanks, I sorted it out

[talleychan]

I see one significant difference between the SDK and Arduino linker scripts. IRAM contains just one segment (.text) in the nonos SDK, whereas Arduino splits IRAM into two segments. 1. text and. text
Thank!