Uploaded August 2026 | Updated September 2026, 2 weeks ago
Join Scott as he works to polish the MCUboot bootloader for use with Zephyr based firmwares like CircuitPython. He'll answer any questions folks have too.
Visit the Adafruit shop online - adafruit.com
Thanks to dcd for timecodes:
0:00 Getting started
0:57 Hello everyone - circuit python (CP) on microprocessor example NRF64LM20
3:25 Join discord for chat (online and during the week)
4:12 Detour into bootloader -
8:00 Seattle happy hardware hour - first Thursday of every month
12:19 github adafruit/adabute
13:22 uf2 bootloaders - then green lake
14:32 oldinsurancemaps.net rabbit trail
15:34 uf2 created to drag/drop boot loaders
17:42 need to preserve the flash segments
19:39 original adafruit UF2 boot loader
20:12 tinyuf2 ( built on tinyusb ) support espressif
20:52 nRF52 bootloader
21:30 adding a fourth boot loader based on zephyr
22:23 LLM coding
23:32 safe mode support added "saved word" ( including unit test )
25:45 swapping regions for software update over the air (OTA)
29:08 UF2 application that can update itself
29:50 OTA_0 and OTA_1 discussion
32:18 boot loader status indicators, and double tap
33:13 partition table example nrf54lm20dk.dtsi
39:54 ROM bootloaders
43:33 enter boot loader via double reset
45:39 boot/zephyr/main.c and CONFIG_BOOT_SERIAL_DOUBLE_TAP (double tapping reset)
47:35 related to CP reset and boot button
51:10 consider firmware for coprocessors also
52:30 thinking about pin muxing in parallel
54:00 build and reflash the bootloader
55:00 CURRENT.UF2 support for dragging off the non volatile memory, and INFO_UF2.TXT
56:40 copy the updater to the UF2 drive
52:23 next week in new office!
1:00:44 display support
-----------------------------------------
LIVE CHAT IS HERE! http://adafru.it/discord
Subscribe to Adafruit on YouTube: http://adafru.it/subscribe
New tutorials on the Adafruit Learning System: learn.adafruit.com
-----------------------------------------
Join Scott as he works to polish the MCUboot bootloader for use with Zephyr based firmwares like CircuitPython. He'll answer any questions folks have too.
Visit the Adafruit shop online - adafruit.com
Thanks to dcd for timecodes:
0:00 Getting started
0:57 Hello everyone - circuit python (CP) on microprocessor example NRF64LM20
3:25 Join discord for chat (online and during the week)
4:12 Detour into bootloader -
8:00 Seattle happy hardware hour - first Thursday of every month
12:19 github adafruit/adabute
13:22 uf2 bootloaders - then green lake
14:32 oldinsurancemaps.net rabbit trail
15:34 uf2 created to drag/drop boot loaders
17:42 need to preserve the flash segments
19:39 original adafruit UF2 boot loader
20:12 tinyuf2 ( built on tinyusb ) support espressif
20:52 nRF52 bootloader
21:30 adding a fourth boot loader based on zephyr
22:23 LLM coding
23:32 safe mode support added "saved word" ( including unit test )
25:45 swapping regions for software update over the air (OTA)
29:08 UF2 application that can update itself
29:50 OTA_0 and OTA_1 discussion
32:18 boot loader status indicators, and double tap
33:13 partition table example nrf54lm20dk.dtsi
39:54 ROM bootloaders
43:33 enter boot loader via double reset
45:39 boot/zephyr/main.c and CONFIG_BOOT_SERIAL_DOUBLE_TAP (double tapping reset)
47:35 related to CP reset and boot button
51:10 consider firmware for coprocessors also
52:30 thinking about pin muxing in parallel
54:00 build and reflash the bootloader
55:00 CURRENT.UF2 support for dragging off the non volatile memory, and INFO_UF2.TXT
56:40 copy the updater to the UF2 drive
52:23 next week in new office!
1:00:44 display support
-----------------------------------------
LIVE CHAT IS HERE! http://adafru.it/discord
Subscribe to Adafruit on YouTube: http://adafru.it/subscribe
New tutorials on the Adafruit Learning System: learn.adafruit.com
-----------------------------------------
