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cpu/esp8266: build the SDK bootloader from source #19073

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cpu/esp8266: build the SDK bootloader from source #19073

wants to merge 2 commits into from

Commits on Dec 22, 2022

  1. cpu/esp8266: Build the SDK bootloader from source. 

    We had four versions of pre-built bootloaders for the esp8266 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. In
particular, flash size and flash speed is important for the bootloader
to be able to load an app from a large partition table at the fastest
speed supported by the board layout and flash chip.

Another example is the UART baudrate of the logging output from the
bootloader. The boot ROM will normally start at a baud rate of 74880
(depending on the crystal installed), so it might make sense to keep
the UART output at the same speed so we can debug boot modes and
bootloader with the same terminal.

This patch builds the bootloader.bin file from the ESP8266 SDK source
code. The code is built as a module (esp8266_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.

The code needs to be compiled and linked with custom rules defined in
the module's Makefile since the bootloader.bin is its own separate
application.

The `BOOTLOADER_BIN` variable is changed from a path relative to the
`$(RIOTCPU)/$(CPU)/bin/` directory to be full path. This makes it easier
for applications or board to provide their own bootloader binary if
needed.

As a result of building the bootloader from source we fixed the issue of
having a large partition table. Fixes RIOT-OS#16402.
    @iosabi @gschorcht
    iosabi authored and gschorcht committed Dec 22, 2022
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  2. cpu/esp_common: remove double defines from Makefile

    @gschorcht
    gschorcht committed Dec 22, 2022
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