32 lines
1.7 KiB
Plaintext
Executable File
32 lines
1.7 KiB
Plaintext
Executable File
1. In the application project, modify the "memory settings" linker option. In the FLASH segment add:
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.bootldrinfo=0xF7FC (for atmega with 128K Flash), or
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.bootldrinfo=0x37FC (for atmega with 32K Flash)
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It should be 8 bytes (4 words) before the start of the bootloader area.
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2. Change the application version number as desired.
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3. Rebuild the application to generate a new .hex file
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4. In the bootloader project, modify the "memory settings" linker option. In the FLASH segment add:
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.text=0xF800 (for atmega with 128K Flash), or
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.text=0x3800 (for atmega with 32K Flash)
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It should be the start of the bootloader area in words. These numbers assume a 4K bootloader.
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5. Modify the "Symbols" compiler and assembler options. Change
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.text=0x1F000 (for atmega with 128K Flash), or
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.text=0x7000 (for atmega with 32K Flash)
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It should be the start of the bootloader area in bytes. These numbers assume a 4K bootloader.
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6. Rebuild the bootloader project to generate a new .hex file
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7. Append the bootloader to the application .hex file. You can do this in a text editor, after
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deleting the line :00000001FF at the end of the application section, or using srec_cat:
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srec_cat application.hex -intel bootloader.hex -intel -o merged.hex -intel
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8. Program the merged .hex file to the board, just like you would for any other .hex
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9. Connect to the board with the ISP programmer. Set the BOOTSZ fuse to 2048W (for 4K bootloader)
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and BOOTRST fuse to on/true.
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10. To generate the .bin file used by the bootloader to flash new code updates, use
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avr-objcopy -O binary -R .eeprom -R .fuse -R .lock -R .signature application.elf application.bin |