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+
+#------------------------------------------------------------------------------
+# $File: uf2,v 1.3 2021/04/28 01:00:31 christos Exp $
+# uf2: file(1) magic for UF2 firmware image files
+#
+# https://github.com/microsoft/uf2
+#
+# Created by Blake Ramsdell <blaker@gmail.com>
+
+0 string UF2\n UF2 firmware image
+!:ext uf2
+# This is for checking the other magic numbers, do we want to do that?
+#>4 lelong 0x9E5D5157 howdy
+#>>508 lelong 0x0AB16F30 doody
+>8 lelong &0x0001 \b, not main flash
+>8 lelong &0x1000 \b, file container
+>8 lelong &0x2000 \b, family
+
+# To update the UF2 family data, use this fine command
+#
+# families=`curl \
+# https://raw.githubusercontent.com/microsoft/uf2/master/utils/uf2families.json \
+# | jq -r '.[] | ">>28\tlelong\t\(.id)\t\(.description)"' | sort -n -k 3` && \
+# perl -0777 -i -pe \
+# "s/(### BEGIN UF2 FAMILIES\\n).*(\\n### END UF2 FAMILIES)/\$1$families\$2/s" \
+# uf2
+
+### BEGIN UF2 FAMILIES
+>>28 lelong 0x00ff6919 ST STM32L4xx
+>>28 lelong 0x04240bdf ST STM32L5xx
+>>28 lelong 0x16573617 Microchip (Atmel) ATmega32
+>>28 lelong 0x1851780a Microchip (Atmel) SAML21
+>>28 lelong 0x1b57745f Nordic NRF52
+>>28 lelong 0x1c5f21b0 ESP32
+>>28 lelong 0x1e1f432d ST STM32L1xx
+>>28 lelong 0x202e3a91 ST STM32L0xx
+>>28 lelong 0x21460ff0 ST STM32WLxx
+>>28 lelong 0x2abc77ec NXP LPC55xx
+>>28 lelong 0x300f5633 ST STM32G0xx
+>>28 lelong 0x31d228c6 GD32F350
+>>28 lelong 0x4c71240a ST STM32G4xx
+>>28 lelong 0x4fb2d5bd NXP i.MX RT10XX
+>>28 lelong 0x53b80f00 ST STM32F7xx
+>>28 lelong 0x55114460 Microchip (Atmel) SAMD51
+>>28 lelong 0x57755a57 ST STM32F401
+>>28 lelong 0x5a18069b Cypress FX2
+>>28 lelong 0x5d1a0a2e ST STM32F2xx
+>>28 lelong 0x5ee21072 ST STM32F103
+>>28 lelong 0x647824b6 ST STM32F0xx
+>>28 lelong 0x68ed2b88 Microchip (Atmel) SAMD21
+>>28 lelong 0x6b846188 ST STM32F3xx
+>>28 lelong 0x6d0922fa ST STM32F407
+>>28 lelong 0x6db66082 ST STM32H7xx
+>>28 lelong 0x70d16653 ST STM32WBxx
+>>28 lelong 0x7eab61ed ESP8266
+>>28 lelong 0x7f83e793 NXP KL32L2x
+>>28 lelong 0x8fb060fe ST STM32F407VG
+>>28 lelong 0xada52840 Nordic NRF52840
+>>28 lelong 0xbfdd4eee ESP32-S2
+>>28 lelong 0xc47e5767 ESP32-S3
+>>28 lelong 0xd42ba06c ESP32-C3
+>>28 lelong 0xe48bff56 Raspberry Pi RP2040
+### END UF2 FAMILIES
+
+>>28 default x
+>>>28 lelong x %#08x
+>8 lelong&0x2000 0 \b, file size
+>>28 lelong x %#08x
+>8 lelong &0x4000 \b, MD5 checksum present
+>8 lelong &0x8000 \b, extension tags present
+>12 lelong x \b, address %#08x
+>24 lelong x \b, %u total blocks