Guide to install a minimal Linux distribution on the ESP32-S3-WROOM 1 and compile applications to be executed in the device.
After completing this tutorial, the following main functionalities should be available:
These instructions were tested in Ubuntu 22.04 LTS.
Credit to jcmvbkbc!
# Generate configuration for device git clone https://github.com/jcmvbkbc/xtensa-dynconfig -b original git clone https://github.com/jcmvbkbc/config-esp32s3 esp32s3 make -C xtensa-dynconfig ORIG=1 CONF_DIR=`pwd` esp32s3.so export XTENSA_GNU_CONFIG=`pwd`/xtensa-dynconfig/esp32s3.so # Build the actual toolchain git clone https://github.com/jcmvbkbc/crosstool-NG.git -b xtensa-fdpic pushd crosstool-NG ./bootstrap && ./configure --enable-local && make ./ct-ng xtensa-esp32s3-linux-uclibcfdpic CT_PREFIX=`pwd`/builds nice ./ct-ng build popd
This code may take a while and there will be a few errors when it finishes. Nevertheless, all the binary utilities will still be produced and can be found at crosstool-NG/builds/xtensa-esp32s3-linux-uclibcfdpic/bin/.
Here's an example of how to compile an application:
export PATH=`pwd`/crosstool-NG/builds/xtensa-esp32s3-linux-uclibcfdpic/bin/:$PATH export XTENSA_GNU_CONFIG=`pwd`/xtensa-dynconfig/esp32s3.so xtensa-esp32s3-linux-uclibcfdpic-gcc -mfdpic hello.c -o hello
Additionally, the following flags may be added to minimize application stack size: -Wl,-z,stack-size=….
Refer to the following documentation to use gpio]].
git clone https://github.com/jcmvbkbc/buildroot -b xtensa-2023.08-fdpic
If required, before compiling, buildroot may be reconfigured by typing.
make menuconfig
In addition, the name of the packages can be simply added to the configuration file, like so:
echo "BR2_PACKAGE_MTD=y" >> configs/esp32s3_defconfig echo "BR2_PACKAGE_LINUX_TOOLS_GPIO=y" >> configs/esp32s3_defconfig
Furthermore, replace BR2_LINUX_KERNEL_CUSTOM_REPO_URL and BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION by the following to enable runtime reconfigurable stack size.
@@ -13,8 +13,10 @@ BR2_ROOTFS_POST_FAKEROOT_SCRIPT="board/espressif/esp32s3/mkfs-etc.sh" BR2_ROOTFS_POST_IMAGE_SCRIPT="board/espressif/esp32s3/post-build.sh" BR2_LINUX_KERNEL=y BR2_LINUX_KERNEL_CUSTOM_GIT=y -BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/jcmvbkbc/linux-xtensa.git" -BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="xtensa-6.6-esp32-gpio" +BR2_LINUX_KERNEL_CUSTOM_REPO_URL="https://github.com/joaomiguelvieira/linux-xtensa.git" +BR2_LINUX_KERNEL_CUSTOM_REPO_VERSION="main" BR2_LINUX_KERNEL_USE_CUSTOM_CONFIG=y BR2_LINUX_KERNEL_CUSTOM_CONFIG_FILE="board/espressif/esp32s3/linux.config" BR2_LINUX_KERNEL_IMAGE_TARGET_CUSTOM=y
nice make -C buildroot O=`pwd`/build-buildroot-esp32s3 esp32s3_defconfig buildroot/utils/config --file build-buildroot-esp32s3/.config --set-str TOOLCHAIN_EXTERNAL_PATH `pwd`/crosstool-NG/builds/xtensa-esp32s3-linux-uclibcfdpic buildroot/utils/config --file build-buildroot-esp32s3/.config --set-str TOOLCHAIN_EXTERNAL_PREFIX '$(ARCH)-esp32s3-linux-uclibcfdpic' buildroot/utils/config --file build-buildroot-esp32s3/.config --set-str TOOLCHAIN_EXTERNAL_CUSTOM_PREFIX '$(ARCH)-esp32s3-linux-uclibcfdpic' nice make -C buildroot O=`pwd`/build-buildroot-esp32s3
At this point, the files xipImage, rootfs.cramfs, and etc.jffs2 can be found at build-buildroot-esp32s3/images.
IMPORTANT NOTE: A particular esp-idf toolchain will be downloaded to build the bootloader, which usually conflicts with other installations. It is recommended not to have any other installation present, otherwise, the setup might fail.
git clone https://github.com/jcmvbkbc/esp-hosted -b ipc pushd esp-hosted/esp_hosted_ng/esp/esp_driver cmake . cd esp-idf . export.sh cd ../network_adapter idf.py set-target esp32s3 cp sdkconfig.defaults.esp32s3 sdkconfig
Since both the configuration file and the partition table are designed for an 8M external expansion flash, these files can be changed in order to use the entire memory space. In this example, a new partition (opt) will be created using the remaining 8M to be used as writable user space in the device. Note that, by default, only /etc is writable.
~ # diff sdkconfig.defaults.esp32s3 sdkconfig 106,107c106,107 < CONFIG_ESPTOOLPY_FLASHSIZE_8MB=y < # CONFIG_ESPTOOLPY_FLASHSIZE_16MB is not set --- > # CONFIG_ESPTOOLPY_FLASHSIZE_8MB is not set > CONFIG_ESPTOOLPY_FLASHSIZE_16MB=y 111c111 < CONFIG_ESPTOOLPY_FLASHSIZE="8MB" --- > CONFIG_ESPTOOLPY_FLASHSIZE="16MB" 1186c1186 < CONFIG_SPIFFS_MAX_PARTITIONS=3 --- > CONFIG_SPIFFS_MAX_PARTITIONS=4
## Label type ST Offset Length nvs, data, nvs, 0x0000a000, 0x00005000 phy_init, data, phy, 0x0000f000, 0x00001000 factory, app, factory, 0x00010000, 0x000a0000 etc, 0x40, 0x1, 0x000b0000, 0x00070000 linux, 0x40, 0x0, 0x00120000, 0x00360000 rootfs, 0x40, 0x1, 0x00480000, 0x003d0000 opt, 0x40, 0x1, 0x00850000, 0x007a0000
idf.py build
The following files are now present:
build/bootloader/bootloader.bin,build/partition_table/partition-table.bin,build/network_adapter.bin.
The following script requires a working installation of esp-idf. Considering that the name of the device in the system is /dev/ttyACM0, run the following to flash the device:
python ~/esp/esp-idf/components/esptool_py/esptool/esptool.py --chip esp32s3 -p /dev/ttyACM0 -b 921600 --before=default_reset --after=hard_reset write_flash 0x0 bootloader.bin 0x10000 network_adapter.bin 0x8000 partition-table.bin python ~/esp/esp-idf/components/partition_table/parttool.py write_partition --partition-name linux --input xipImage python ~/esp/esp-idf/components/partition_table/parttool.py write_partition --partition-name rootfs --input rootfs.cramfs python ~/esp/esp-idf/components/partition_table/parttool.py write_partition --partition-name etc --input etc.jffs2
+-----------------------------------------------------------------------+ | A - Serial Device : /dev/ttyACM0 | | B - Lockfile Location : /var/lock | | C - Callin Program : | | D - Callout Program : | | E - Bps/Par/Bits : 115200 8N1 | | F - Hardware Flow Control : No | | G - Software Flow Control : No | | | | Change which setting? | +-----------------------------------------------------------------------+
flash_erase -j /dev/mtd6 0 122 echo "mtd:opt /opt jffs2 nofail 0 0" >> /etc/fstab mount -a
Explanation:
opt being the seventh (id=6). Therefore, it is identified as /dev/mtd6. The flash_erase tool has usage flash_erase [options] MTD_DEVICE <start offset> <block count>.opt has a total of 0x007a0000 bytes and blocks are 64KB, there are 122 blocks in opt.cd /etc cp wpa_supplicant.conf wpa_supplicant.conf.bak cp wpa_supplicant.conf.example wpa_supplicant.conf
Edit the file “wpa_supplicant.conf” by entering your wifi credentials.