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Adding FPROT flash protection bit for 4k Bootloader on the mk20dx128vlf5
- Minimum protection size is 4k on the mk20dx128vlf5simple
Jacob Alexander
9 years ago
1 changed files with 11 additions and 1 deletions
+ 11
- 1
Lib/mk20dx.c
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| @@ -361,7 +361,17 @@ const uint8_t flashconfigbytes[16] = { | |||
| __attribute__ ((section(".flashconfig"), used)) | |||
| const uint8_t flashconfigbytes[16] = { | |||
| 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, 0xFF, // Backdoor Verif Key 28.3.1 | |||
| 0xFF, 0xFF, 0xFF, 0xFF, // Program Flash Protection Bytes FPROT0-3 | |||
| // | |||
| // Protecting the first 4k of Flash memory from being over-written while running (bootloader protection) | |||
| // Still possible to overwrite the bootloader using an external flashing device | |||
| // For more details see: | |||
| // http://cache.freescale.com/files/training/doc/dwf/AMF_ENT_T1031_Boston.pdf (page 8) | |||
| // http://cache.freescale.com/files/microcontrollers/doc/app_note/AN4507.pdf | |||
| // http://cache.freescale.com/files/32bit/doc/ref_manual/K20P48M50SF0RM.pdf (28.34.6) | |||
| // | |||
| 0xFF, 0xFF, 0xFF, 0xFE, // Program Flash Protection Bytes FPROT0-3 | |||
| 0xBE, // Flash security byte FSEC | |||
| 0x03, // Flash nonvolatile option byte FOPT | |||
| 0xFF, // EEPROM Protection Byte FEPROT | |||