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Bootloader Firmware Files

Built firmware files for EFR32MG1B232F256GM48 (Lidl Silvercrest Gateway).

Downloads (pre-built v2.4.2)

File formats

File Content Flash Address Usage
first_stage.s37 Stage 1 (BSL) 0x0000-0x07FF J-Link only
bootloader-uart-xmodem-X.Y.Z.s37 Stage 2 (Main) 0x0800-0x3FFF J-Link (Silabs format)
bootloader-uart-xmodem-X.Y.Z.gbl Stage 2 in GBL - XMODEM upload
bootloader-uart-xmodem-X.Y.Z.hex Stage 2 0x0800-0x3FFF J-Link (Intel HEX format)
bootloader-uart-xmodem-X.Y.Z.bin Stage 2 raw binary - Other programmers

When to Use Each File

Stage 1 (first_stage.s37)

  • Required: Only via J-Link/SWD
  • When: Fresh chip, corrupted Stage 1, or full chip erase
  • Note: Normally flashed once and never updated

Stage 2 (bootloader-uart-xmodem-X.Y.Z.s37)

  • Method: J-Link/SWD
  • When: Initial setup or Stage 1 already present

Stage 2 GBL (bootloader-uart-xmodem-X.Y.Z.gbl)

  • Method: XMODEM over UART
  • When: Updating bootloader remotely (Stage 1 must be working)
  • Requires: Existing working bootloader to receive the update

Flash Commands

# Flash both stages
commander flash first_stage.s37 --device EFR32MG1B232F256GM48
commander flash bootloader-uart-xmodem-2.4.2.s37 --device EFR32MG1B232F256GM48

commander flash bootloader-uart-xmodem-2.4.2.s37 --device EFR32MG1B232F256GM48

Stage 2 update via XMODEM (remote)

# Requires working Stage 1 bootloader
# Enter bootloader mode, then send .gbl via XMODEM

Memory Map

0x00000000 ┌─────────────────────────┐
           │  Stage 1 (2 KB)         │ ← first_stage.s37
0x00000800 ├─────────────────────────┤
           │  Stage 2 (14 KB)        │ ← bootloader-uart-xmodem-X.Y.Z.s37
0x00004000 ├─────────────────────────┤
           │  Application            │ ← NCP or Router firmware
           │                         │
0x00040000 └─────────────────────────┘