SR110 Build and Flash with CLI

This document provides concise, CLI-only steps to build, convert, and flash SR110 applications. For additional SDK details, see Astra MCU SDK User Guide.

Throughout this guide, <sdk-root> refers to the directory where you extracted or cloned the SDK.

Table of Contents

Prerequisites
CLI Flow (Build + Image Conversion + Flash)
Running Examples

Prerequisites

Astra Machina Micro connected per the SR110 Platform Guide.
CLI environment, toolchains, Python tools, and OpenOCD installed. See Setup and Install SDK using CLI.
Python virtual environment activated. See Setup and Install SDK using CLI.

CLI Flow (Build + Image Conversion + Flash)

Build the application (SDK build + example build):

List all available application defconfigs (these are the presets you can build):
```
ls <sdk-root>/examples/SR110_RDK/configs/*defconfig
```
Recommended first example: cm55_demo_sample_app_defconfig.

Set SRSDK_DIR to <sdk-root> and build (run from <sdk-root>/examples).
- The first make applies the defconfig and builds the SDK package for SR110.
- The second make build builds the example using the installed SDK package.
```
cd <sdk-root>/examples
export SRSDK_DIR=<sdk-root>

make cm55_demo_sample_app_defconfig BOARD=SR110_RDK BUILD=SRSDK
make build BOARD=SR110_RDK
```
Expected output:
```
<sdk-root>/examples/out/sr110_cm55_fw/release/sr110_cm55_fw.elf   # GCC/LLVM
<sdk-root>/examples/out/sr110_cm55_fw/release/sr110_cm55_fw.axf   # AC6
```

Generate the flash image (SDK image generator; run from <sdk-root>/tools/srsdk_image_generator):

cd <sdk-root>/tools/srsdk_image_generator
python srsdk_image_generator.py \
  -B0 \
  -flash_image \
  -sdk_secured \
  -spk "<sdk-root>/tools/srsdk_image_generator/B0_Input_examples/spk_rc4_1_0_secure_otpk.bin" \
  -apbl "<sdk-root>/tools/srsdk_image_generator/B0_Input_examples/sr100_b0_bootloader_ver_0x012F_ASIC.axf" \
  -m55_image "<sdk-root>/examples/out/sr110_cm55_fw/release/sr110_cm55_fw.elf" \
  -flash_type "GD25LE128" \
  -flash_freq "67"

Expected output:

<sdk-root>/tools/srsdk_image_generator/Output/B0_Flash/B0_flash_full_image_GD25LE128_67Mhz_secured.bin

Flash the image to external flash, ensure J14 is plugged in.

If you are running WSL, please consult the Astra MCU SDK - WSL User Guide to ensure USB ports are properly handled.
```
cd <sdk-root>
python tools/openocd/scripts/flash_xspi_tcl.py \
  --cfg_path tools/openocd/configs/sr110_m55.cfg \
  --image tools/srsdk_image_generator/Output/B0_Flash/B0_flash_full_image_GD25LE128_67Mhz_secured.bin \
  --erase-all
```
- Use --probe jlink if you are flashing with J-Link.
- Expected result: the flash tool completes without errors and the image is programmed.
Reset the board to boot from external flash:
- Unplug and replug USB, or press the reset button.

Running Examples

After flashing, reset the board and follow the README for the example you built.