feat(dfu): Embassy boot and dfu flashing by Schievel1 · Pull Request #877 · HaoboGu/rmk

Schievel1 · 2026-06-08T22:24:51Z

This PR adds DFU (Device Firmware Upgrade) support via embassy-boot for RP2040-based and NRF52840-based keyboards. Once set up, firmware updates can be done over USB with dfu-util — no need to press BOOTSEL/ RESET or use a debug probe.

What's implemented

rmk crate — new dfu_rp feature gate:

dfu.rs: init_flash() initializes the blocking flash with configurable partition offsets and returns a storage partition for RMK's keymap storage
set_led() / mark_booted() — optional DFU activity LED and boot-success signaling to prevent bootloader rollback
register_dfu_interface() — registers a USB DFU class (embassy-usb-dfu) with a handler that blinks the LED during transfers
DfuLock (behind dfu_lock feature) — physical key unlock for DFU: pressing the configured matrix keys unlocks DFU for 10 s, with Morse "DFU" LED blinking
Automatic DFU interface registration in UsbTransport::new() when the manager is initialized

rmk-config crate — new [dfu] TOML section:

flash_size, page_size — auto-calculate partition addresses using the bootymcbootface formula (state at 0x6000, active at 0x7000, DFU slot follows) (bootymcbootface (https://codeberg.org/Schievel/bootymcbootface/) is the matching bootloader for this, but people could roll their own and use whatever partitioning suits them)
led — optional GPIO pin for DFU activity
unlock_keys — matrix positions for dfu_lock
Manual override of state_offset, state_size, dfu_offset, dfu_size for custom layouts

flash formula

embassy-boot needs a DFU and an ACTIVE partition. ACTIVE is where the actual firmware sits, DFU is where we can put firmware using dfu-utils for example and embassy-boot then copies DFU to ACTIVE.
Apart from that me have:

BOOT2, where the RP2040 bootloader lives, address 0x10000000 (beginning of flash), length fixed 0x100 (for nRF52840 this does not exist and the embassy-boot partition is expanded to start at 0x0)
embassy-boot, where embassy-boots code lives, after BOOT2, address fixed 0x10000100, length fixed to 24K-0x100
BOOTLOADER_STATE, where embassy-boot puts it's own state, and where we set a flag from RMK that we want to update DFU to ACTIVE, after embassy-boot, address fixed 0x10006000, length fixed 4K
ACTIVE, where the currently running RMK lives, address fixed 0x10007000, variable length
DFU, where we put the firmware we want embassy-boot to flash, address variable (depends on ACTIVE length), length = ACTIVE length + 1 page
STORAGE, address variable (depends on ACTIVE + DFU), length fixed 128K

As a diagram:

 ┌─────────────────────────────────┐
 │ 0x10000000                      │
 │  +───────────────+  0x10000100  │
 │  │ BOOT2 (256B)  │              │
 │  +───────────────+  0x10000100  │
 │  │               │              │
 │  │ EMBASSY-BOOT  │              │
 │  │ (24K - 256B)  │              │
 │  │               │              │
 │  +───────────────+  0x10006000  │
 │  │ BOOTLOADER    │              │
 │  │ STATE (4K)    │              │
 │  +───────────────+  0x10007000  │
 │  │               │              │
 │  │ ACTIVE        │              │
 │  │ (variable)    │              │
 │  │               │              │
 │  ├───────────────┤  ACTIVE_END  │
 │  │               │              │
 │  │ DFU           │              │
 │  │ (ACTIVE+4K)   │              │
 │  │               │              │
 │  ├───────────────┤  DFU_END     │
 │  │               │              │
 │  │ STORAGE       │              │
 │  │ (128K)        │              │
 │  │               │              │
 │  +───────────────+  STORAGE_END │
 │ FLASH_END                       │
 └─────────────────────────────────┘

In order to partition the flash I use the following constraints:

we want ACTIVE partition to be a big as possible while also allowing a bit of storage
DFU needs to be as big as active + 1 page that embassy-boot uses for the state during flashing. This way it known where it was after continuing after a power loss and can continue flashing DFU to ACTIVE
the partitions before ACTIVE (BOOT2, embassy-boot, BOOTLOADER_STATE) have fixed addresses and lengths. Therefore ACTIVE has a fixed address as well. (but not a fixed length
since ACTIVE has a variable length, the address of DFU must be calculatd.
STORAGE comes after ACTIVE and DFU, which have a variable length, therefore the address of STORAGE must be calculated.

To calculate the length of ACTIVE, I calculate the remaining flash after subtracting all the fixed size partitions (BOOT2, EMBASSY-BOOT, BOOTLOADER-STATE, STORAGE):
remaining = flash_size - 28K (BOOT2, EMBASSY-BOOT, BOOTLOADER-STATE) - 128K (STORAGE size)
The remaining flash must then be equally sized between ACTIVE and DFU, where DFU gets one more page:
ACTIVE size = (remaining - 4K (page size)) / 2
DFU size = ACTIVE size + 4K (page size)

Then we only need to get the start addresses of DFU and storage:
DFU offset = ACTIVE offset (always 0x10007000) + ACTIVE size
and
STORAGE offset = DFU offset + DFU size

Examples:

examples/use_rust/rp2040_embassy_boot/ — full Rust-API example
Example configs updated for use_config path

Documentation:

New user_guide/flash_firmware/use_embassy_boot.mdx with setup guide (bootymcbootface, compilation, step-by-step flashing, DFU usage, dfu_lock, LED behavior)
RP2040 + embassy-boot section in configuration/chip_config.mdx with partition table and TOML/Rust tabs

Feature flags

dfu — base DFU support (USB DFU interface)
dfu_rp — RP2040-specific DFU with embassy-boot (implies dfu + rp2040)
dfu_lock — physical key unlock for DFU (implies dfu_rp + host_security)

Usage flow

Flash bootymcbootface (once, via UF2 or probe-rs)
Compile RMK with dfu_rp feature and matching flash size
Flash RMK firmware (via UF2 or probe-rs)
All future updates: cargo make bin && dfu-util -D firmware.bin

Perspective / Roadmap

Since embassy-boot is agnostic towards how the updated firmware gets into the DFU partition, this PR lays the foundation for future features like flashing via bluetooth or flashing the peripheral from the central using the serial connection between them.
I think the next steps after merging this should be:

flash nrf/ pico w using BLE (maybe with our own nrf ble dfu implementation. The protocol is public.
flash peripheral from central (see feat(dfu_split): Embassy boot flash peripheral from central #886)

Needs:

feat(dfu): add cargo make bin task for rp2040/pico_w/nrf52840 templates rmk-template#20

Optional:

github-actions · 2026-06-08T22:33:29Z

Size Report

Example	main	PR	Diff	.text
`use_config/nrf52832_ble`	394.8 KiB	394.8 KiB	+0.00% ⬇️	-4
`use_config/nrf52840_ble`	443.3 KiB	443.3 KiB	+0.00% ⬇️	-4
`use_config/nrf52840_ble_split (central)`	492.5 KiB	492.5 KiB	+0.00% ⬆️	+4
`use_config/nrf52840_ble_split (peripheral)`	316.9 KiB	316.9 KiB	+0.00% ⬆️	+8
`use_config/pi_pico_w_ble`	667.9 KiB	667.9 KiB	+0.00% ⬇️	-32
`use_config/rp2040`	148.5 KiB	148.5 KiB	+0.00% ⬆️	+4
`use_config/rp2040_split (central)`	162.1 KiB	162.1 KiB	+0.00%	0
`use_config/rp2040_split (peripheral)`	27.8 KiB	27.8 KiB	+0.01% ⬆️	+4
`use_config/stm32f1`	63.0 KiB	63.0 KiB	+0.00%	0
`use_config/stm32h7`	100.0 KiB	100.0 KiB	+0.00% ⬇️	-4
`use_rust/nrf52832_ble`	382.2 KiB	382.2 KiB	+0.00% ⬇️	-8
`use_rust/nrf52840_ble`	438.6 KiB	438.6 KiB	+0.00% ⬆️	+8
`use_rust/nrf52840_ble_split (central)`	501.8 KiB	501.8 KiB	+0.00% ⬆️	+4
`use_rust/nrf52840_ble_split (peripheral)`	313.3 KiB	313.3 KiB	+0.00% ⬆️	+8
`use_rust/pi_pico_w_ble`	668.2 KiB	668.2 KiB	+0.00% ⬇️	-24
`use_rust/rp2040`	148.0 KiB	148.0 KiB	+0.00% ⬆️	+8
`use_rust/rp2040_split (central)`	160.8 KiB	160.8 KiB	+0.00% ⬆️	+4
`use_rust/rp2040_split (peripheral)`	28.1 KiB	28.1 KiB	+0.00%	0
`use_rust/stm32f1`	62.9 KiB	62.9 KiB	+0.00% ⬇️	-4
`use_rust/stm32h7`	122.3 KiB	122.3 KiB	+0.00%	0

use_config/nrf52832_ble — 394.8 KiB → 394.8 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 364956	   4588	  34760	 404304	  62b50	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 364960	   4588	  34760	 404308	  62b54	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +565  [ = ]       0    .debug_str
  +0.0%      +9  [ = ]       0    .strtab
  +1.4%      +1  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  -0.0%     -21  [ = ]       0    .debug_line
  -0.0%    -906  [ = ]       0    .debug_info
  -0.0%    -356  -0.0%      -4    TOTAL

use_config/nrf52840_ble — 443.3 KiB → 443.3 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 397912	   4596	  51416	 453924	  6ed24	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 397916	   4596	  51416	 453928	  6ed28	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +517  [ = ]       0    .debug_info
  +0.0%    +176  [ = ]       0    .debug_str
  +0.0%     +54  [ = ]       0    .debug_line
  +4.8%      +3  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  -0.0%      -8  [ = ]       0    .debug_ranges
  -0.0%     -22  [ = ]       0    .strtab
  +0.0%    +716  -0.0%      -4    TOTAL

use_config/nrf52840_ble_split (central) — 492.5 KiB → 492.5 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 452848	   4652	  46808	 504308	  7b1f4	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 452844	   4652	  46808	 504304	  7b1f0	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +27  [ = ]       0    .strtab
  +0.0%     +16  [ = ]       0    .debug_info
  +0.0%      +4  +0.0%      +4    .text
 -10.7%      -6  [ = ]       0    [Unmapped]
  -0.0%     -23  [ = ]       0    .debug_line
  -0.0%     -38  [ = ]       0    .debug_str
  -0.0%     -20  +0.0%      +4    TOTAL

use_config/nrf52840_ble_split (peripheral) — 316.9 KiB → 316.9 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 292936	   4468	  27152	 324556	  4f3cc	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 292928	   4468	  27152	 324548	  4f3c4	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +8  +0.0%      +8    .text
  -0.0%      -1  [ = ]       0    .strtab
 -15.9%     -10  [ = ]       0    [Unmapped]
  -0.0%    -377  [ = ]       0    .debug_info
  -0.1% -1.71Ki  [ = ]       0    .debug_str
  -0.0% -2.08Ki  +0.0%      +8    TOTAL

use_config/pi_pico_w_ble — 667.9 KiB → 667.9 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 629340	      0	  54604	 683944	  a6fa8	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 629372	      0	  54604	 683976	  a6fc8	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  -1.9%      -1  [ = ]       0    [Unmapped]
  -0.0%     -23  [ = ]       0    .strtab
  -0.0%     -32  -0.0%     -32    .text
  -0.0%    -104  [ = ]       0    .debug_ranges
  -0.0%    -204  [ = ]       0    .debug_line
  -0.0%    -633  [ = ]       0    .debug_str
  -0.1%    -856  [ = ]       0    .debug_loc
  -0.1% -1.45Ki  [ = ]       0    .debug_info
  -0.0% -3.26Ki  -0.0%     -32    TOTAL

use_config/rp2040 — 148.5 KiB → 148.5 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 136528	      0	  15540	 152068	  25204	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 136524	      0	  15540	 152064	  25200	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +324  [ = ]       0    .debug_info
  +0.1%    +117  [ = ]       0    .debug_line
  +0.0%     +92  [ = ]       0    .debug_str
   +81%     +30  [ = ]       0    [Unmapped]
  +0.0%      +9  [ = ]       0    .strtab
  +0.0%      +4  +0.0%      +4    .text
  +0.0%    +576  +0.0%      +4    TOTAL

use_config/rp2040_split (central) — 162.1 KiB → 162.1 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 149572	      0	  16388	 165960	  28848	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 149572	      0	  16388	 165960	  28848	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +24  [ = ]       0    .strtab
  +0.0%     +10  [ = ]       0    .debug_loc
  -2.3%      -1  [ = ]       0    [Unmapped]
  -0.1%    -104  [ = ]       0    .debug_line
  -0.0%    -465  [ = ]       0    .debug_info
  -0.0%    -680  [ = ]       0    .debug_str
  -0.0% -1.19Ki  [ = ]       0    TOTAL

use_config/rp2040_split (peripheral) — 27.8 KiB → 27.8 KiB (+0.01% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25596	     60	   2796	  28452	   6f24	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25592	     60	   2796	  28448	   6f20	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +22  [ = ]       0    .debug_str
  +0.0%      +5  [ = ]       0    .strtab
  +0.1%      +4  +0.1%      +4    .rodata
  +1.8%      +1  [ = ]       0    [Unmapped]
  +0.0%     +32  +0.0%      +4    TOTAL

use_config/stm32f1 — 63.0 KiB → 63.0 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  56956	     28	   7520	  64504	   fbf8	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  56956	     28	   7520	  64504	   fbf8	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +3  [ = ]       0    .debug_line
  +3.6%      +2  [ = ]       0    [Unmapped]
  -0.0%    -124  [ = ]       0    .debug_info
  -0.1%    -377  [ = ]       0    .debug_str
  -0.0%    -496  [ = ]       0    TOTAL

use_config/stm32h7 — 100.0 KiB → 100.0 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  92396	    268	   9760	 102424	  19018	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  92400	    268	   9760	 102428	  1901c	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +327  [ = ]       0    .debug_str
  +0.1%    +154  [ = ]       0    .debug_line
  +0.0%    +129  [ = ]       0    .debug_info
   +12%      +6  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  +0.0%    +612  -0.0%      -4    TOTAL

use_rust/nrf52832_ble — 382.2 KiB → 382.2 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 353016	   4588	  33744	 391348	  5f8b4	rmk-nrf52832

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 353024	   4588	  33744	 391356	  5f8bc	rmk-nrf52832

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +91  [ = ]       0    .debug_str
  +0.0%      +1  [ = ]       0    .strtab
  -0.0%      -8  -0.0%      -8    .text
  -0.2%     -18  [ = ]       0    .debug_abbrev
 -37.1%     -26  [ = ]       0    [Unmapped]
  -0.1%    -156  [ = ]       0    .debug_line
  -0.0%    -880  [ = ]       0    .debug_info
  -0.0%    -996  -0.0%      -8    TOTAL

use_rust/nrf52840_ble — 438.6 KiB → 438.6 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 397588	   4596	  46904	 449088	  6da40	rmk-nrf52840

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 397580	   4596	  46904	 449080	  6da38	rmk-nrf52840

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +50%     +25  [ = ]       0    [Unmapped]
  +0.0%     +15  [ = ]       0    .strtab
  +0.0%     +10  [ = ]       0    .debug_loc
  +0.0%      +8  +0.0%      +8    .text
  -0.0%     -36  [ = ]       0    .debug_line
  -0.6%     -55  [ = ]       0    .debug_abbrev
  -0.0%    -220  [ = ]       0    .debug_str
  -0.0%    -343  [ = ]       0    .debug_info
  -0.0%    -596  +0.0%      +8    TOTAL

use_rust/nrf52840_ble_split (central) — 501.8 KiB → 501.8 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 456684	   4652	  52552	 513888	  7d760	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 456680	   4652	  52552	 513884	  7d75c	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%    +404  [ = ]       0    .debug_str
  +0.1%    +234  [ = ]       0    .debug_line
  +0.0%     +26  [ = ]       0    .strtab
  +0.0%     +12  [ = ]       0    .debug_loc
  +0.0%      +4  +0.0%      +4    .text
 -14.5%      -9  [ = ]       0    [Unmapped]
  -0.0%    -411  [ = ]       0    .debug_info
  +0.0%    +260  +0.0%      +4    TOTAL

use_rust/nrf52840_ble_split (peripheral) — 313.3 KiB → 313.3 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 290920	   4468	  25400	 320788	  4e514	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 290912	   4468	  25400	 320780	  4e50c	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +12  [ = ]       0    .debug_loc
  +0.0%      +8  +0.0%      +8    .text
  -0.0%      -1  [ = ]       0    .strtab
 -10.3%      -6  [ = ]       0    [Unmapped]
  -0.0%     -89  [ = ]       0    .debug_info
  -0.0%    -552  [ = ]       0    .debug_str
  -0.0%    -628  +0.0%      +8    TOTAL

use_rust/pi_pico_w_ble — 668.2 KiB → 668.2 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 629504	      0	  54748	 684252	  a70dc	rmk-pi-pico-w

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 629528	      0	  54748	 684276	  a70f4	rmk-pi-pico-w

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
 -10.9%      -6  [ = ]       0    [Unmapped]
  -0.0%     -23  [ = ]       0    .strtab
  -0.0%     -24  -0.0%     -24    .text
  -0.0%    -104  [ = ]       0    .debug_ranges
  -0.1%    -273  [ = ]       0    .debug_line
  -0.1%    -824  [ = ]       0    .debug_loc
  -0.0%    -850  [ = ]       0    .debug_info
  -0.0%    -904  [ = ]       0    .debug_str
  -0.0% -2.94Ki  -0.0%     -24    TOTAL

use_rust/rp2040 — 148.0 KiB → 148.0 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 136184	      0	  15412	 151596	  2502c	rmk-rp2040

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 136176	      0	  15412	 151588	  25024	rmk-rp2040

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.1%    +109  [ = ]       0    .debug_line
  +0.0%      +9  [ = ]       0    .strtab
  +0.0%      +8  +0.0%      +8    .text
  -9.7%      -6  [ = ]       0    [Unmapped]
  -0.0%     -22  [ = ]       0    .debug_loc
  -0.0%    -176  [ = ]       0    .debug_info
  -0.0%    -386  [ = ]       0    .debug_str
  -0.0%    -464  +0.0%      +8    TOTAL

use_rust/rp2040_split (central) — 160.8 KiB → 160.8 KiB (+0.00% ⬆️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 148456	      0	  16172	 164628	  28314	central

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 148452	      0	  16172	 164624	  28310	central

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +70  [ = ]       0    .debug_str
  +0.0%     +24  [ = ]       0    .strtab
  +0.0%      +4  +0.0%      +4    .text
  -8.9%      -4  [ = ]       0    [Unmapped]
  -0.1%    -119  [ = ]       0    .debug_line
  -0.0%    -451  [ = ]       0    .debug_info
  -0.0%    -476  +0.0%      +4    TOTAL

use_rust/rp2040_split (peripheral) — 28.1 KiB → 28.1 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  25656	     60	   3060	  28776	   7068	peripheral

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  25656	     60	   3060	  28776	   7068	peripheral

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%     +19  [ = ]       0    .debug_str
  +0.0%      +5  [ = ]       0    .strtab
  +0.0%     +24  [ = ]       0    TOTAL

use_rust/stm32f1 — 62.9 KiB → 62.9 KiB (+0.00% ⬇️)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
  56892	     28	   7496	  64416	   fba0	rmk-stm32f1

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
  56896	     28	   7496	  64420	   fba4	rmk-stm32f1

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
   +11%      +6  [ = ]       0    [Unmapped]
  -0.0%      -4  -0.0%      -4    .text
  -0.0%     -31  [ = ]       0    .debug_line
  -0.1%    -400  [ = ]       0    .debug_info
  -0.1%    -455  [ = ]       0    .debug_str
  -0.1%    -884  -0.0%      -4    TOTAL

use_rust/stm32h7 — 122.3 KiB → 122.3 KiB (+0.00%)

cargo size (PR):

   text	   data	    bss	    dec	    hex	filename
 109188	    324	  15692	 125204	  1e914	rmk-stm32h7

cargo size (main):

   text	   data	    bss	    dec	    hex	filename
 109188	    324	  15692	 125204	  1e914	rmk-stm32h7

Bloaty diff (PR vs main):

    FILE SIZE        VM SIZE    
 --------------  -------------- 
  +0.0%      +4  [ = ]       0    .strtab
  +0.0%      +2  [ = ]       0    .debug_line
  -9.8%      -4  [ = ]       0    [Unmapped]
  -0.0%     -28  [ = ]       0    .debug_info
  -0.0%    -598  [ = ]       0    .debug_str
  -0.0%    -624  [ = ]       0    TOTAL

Schievel1 · 2026-06-11T23:12:45Z

please review the addresses part thoroughly. I find the flash partitioning and the addressing (inside and outside the partition) quite confusing, as you can see with my bugfix commit for the storage start address.

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

update example cargo.locks Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

HaoboGu

Very nice, thanks for your effort!

HaoboGu

It looks great now

HaoboGu · 2026-07-03T08:38:45Z

Thanks again for your effort! Having DFU support is great

Schievel1 · 2026-07-03T08:55:21Z

Great, thanks for reviewing and merging. I am preparing the follow up with dfu_split support now

This was referenced Jun 9, 2026

feat(dfu): add embassy-boot/ dfu support HaoboGu/rmkit#11

Closed

feat(dfu): add cargo make bin task for rp2040/pico_w/nrf52840 templates HaoboGu/rmk-template#20

Merged

Schievel1 force-pushed the embassy-boot branch 4 times, most recently from 0c23f04 to 9363725 Compare June 11, 2026 14:55

Schievel1 marked this pull request as ready for review June 11, 2026 22:43

Schievel1 force-pushed the embassy-boot branch 2 times, most recently from c2c5d32 to 074f4d5 Compare June 11, 2026 23:10

Schievel1 changed the title ~~Embassy boot and dfu flashing~~ feat(dfu): Embassy boot and dfu flashing Jun 12, 2026

Schievel1 marked this pull request as draft June 12, 2026 18:30

Schievel1 force-pushed the embassy-boot branch 5 times, most recently from 06ccea8 to b1dcd26 Compare June 12, 2026 22:46

This was referenced Jun 12, 2026

update templates for rp2040 & pico w to work with embassy-boot HaoboGu/rmk-template#21

Closed

feat(dfu_split): Embassy boot flash peripheral from central #886

Open

Schievel1 force-pushed the embassy-boot branch 10 times, most recently from 58c3290 to 60c5ea6 Compare June 19, 2026 20:01

Schievel1 force-pushed the embassy-boot branch 16 times, most recently from ea5197d to 1dd85ce Compare July 2, 2026 20:24

Schievel1 added 7 commits July 2, 2026 22:27

feat(dfu): add DFU support for RP2040, add dfu_lock

b38ba66

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

feat(dfu): add nrf52840 USB-DFU support

f6c3ad7

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

feat(dfu): add USB-DFU support for peripheral

9343911

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

add --help for format_all.sh script

90cce01

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

feat(dfu): refactor to modules

ce98203

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

feat(dfu): refactor dfu led to processor

3340db3

Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

feat(dfu): add use_rust example for USB DFU with split

5d58bca

update example cargo.locks Signed-off-by: Pascal Jäger <pascal.jaeger@leimstift.de>

Schievel1 force-pushed the embassy-boot branch from 1dd85ce to 5d58bca Compare July 2, 2026 20:28

Schievel1 requested a review from HaoboGu July 2, 2026 20:28

HaoboGu approved these changes Jul 3, 2026

View reviewed changes

Comment thread docs/docs/main/docs/user_guide/flash_firmware/use_embassy_boot.mdx

Comment thread docs/docs/main/docs/user_guide/flash_firmware/use_embassy_boot.mdx

HaoboGu approved these changes Jul 3, 2026

View reviewed changes

HaoboGu merged commit a04a5ca into HaoboGu:main Jul 3, 2026
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feat(dfu): Embassy boot and dfu flashing#877

feat(dfu): Embassy boot and dfu flashing#877
HaoboGu merged 7 commits into
HaoboGu:mainfrom
Schievel1:embassy-boot

Schievel1 commented Jun 8, 2026 •

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Schievel1 commented Jun 8, 2026 • edited Loading Uh oh! There was an error while loading. Please reload this page.

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What's implemented

rmk-config crate — new [dfu] TOML section:

flash formula

Examples:

Documentation:

Feature flags

Usage flow

Perspective / Roadmap

Needs:

Optional:

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Size Report

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HaoboGu commented Jul 3, 2026

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Schievel1 commented Jun 8, 2026 •

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