cpu/esp32: build the SDK bootloader from source #17457
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Only formatting issues solved, no content changes.
Up to now, there were four versions of prebuilt bootloaders for the ESP32 with different settings of logging and color logging. These bootloaders were manually built from the SDK and shipped with RIOT-OS source code. However there are more settings that affect the bootloader build that are relevant to the app or final board that uses this bootloader. This commit builds the `bootloader.bin` file from the ESP32 SDK source code. It is built as a module `esp_bootloader` which at the moment doesn't generate any object code for the application and only produces a `bootloader.bin` file set to the `BOOTLOADER_BIN` make variable for the `esptool.inc.mk` to flash.
In ESP-IDF archives are generated for all components. The ld script for the bootloader uses archive names of some components to place data and code to the first 64 kByte of IRAM. Since RIOT uses object files instead of archives, the ld script for the bootloader has to modified.
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This was now merged as part of #17601 right? |
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Contribution description
As follow-up to PR #17043 this PR provides the ESP32 bootloader as module which is compiled from SDK sources.
Up to now, there were four precompiled versions of bootloaders (
bootloader.bin) for different settings of logging and colored logging but with a fix size of flash and a fix UART baudrate. To change these parameters, the bootloader has to be recompiled. However there are more settings that affect the bootloader build that might be relevant to the app or final board that uses this bootloader.This PR builds the
bootloader.binfile from the ESP32 SDK sourc as a moduleesp_bootloader. It doesn't generate any object code for the application and only produces abootloader.binfile set to theBOOTLOADER_BINmake variable for theesptool.inc.mkto flash.This PR includes #17455 for the moment to be compilable (commits fded044 b639123 8a84085 3b4c5e9 0c56a2d).
Testing procedure
Use command
and press RESET. The second-stage output should be seen in color. The first-stage bootloader and the application output is seen as garbage since they use a 115200 as baudrate.
Issues/PRs references
Depends on PR #17455
Follow-up to PR #17043