SNU/SFU - Second stage bootloader for WiFi and Serial flash based OTA #469
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…U bootloader makes no sense
… a NINA W102 module
(SNU) Cleaning up second stage bootloader for board with WiFi NINA module
… maximum size which is available for the SNU second stage bootloader. In case of the MKR VIDOR 4000 the necessary FPGA bitstream is injected in the binary image above the usable flash of the MCU by the build system. When using the SNU for the MKR VIDOR 4000 we have to rely on the bitstream being already in place (not a unrealistic assumption, given that the SNU is compiled into a complete Vidor binary + fpga application).
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SNU is a second stage bootloader for SAMD boards with WiFi NINA module (MKR WIFI 1010 and MKR VIDOR 4000). The SNU is loaded by the ATSAMD21G18 bootloader and in turn loads the firmware image stored in WiFi NINA W102 module.
Memory map of ATSAMD21G18 flash space with bootloader, SNU and application:
SFU is a second stage bootloader for SAMD boards when an external serial flash connected. Since the SerialFlash library is used all serial flash memories supported by this library are supported. Memory map is identical with the SNU memory map, but instead of the SNU binary the SFU binary is included in the two consecutive flash sections after the bootloader.