veghead/nrf52_boot.md

## nrf52_boot.md

      
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              nrf52_boot.md
            
          
    Upon system reset, the execution branches to the MBR Reset Handler as specified in the System Vector Table.
The sequence is MBR -> bootloader -> application.
The MBR is provided by the softdevice.
The MBR uses a configuration page, the address of which is MBRPARAMADDR which is MBR_PARAM_ADDR (defined in nrf_mbr.h), or if this is 0xFFFFFFFF, UICR.NRFFW[1]
Bootloader address is BOOTLOADERADDR which is MBR_BOOTLOADER_ADDR (defined in nrf_mbr.h). If this is 0xFFFFFFFF, UICR.NRFFW[0] is used instead.
APP_CODE_BASE hardcoded in softdevice
The bootloader build creates two blocks of hex. The bootloader itself and UICR.NRFFW[0] which contains the address of MBR_BOOTLOADER_ADDR
(from hexinfo.py):
- { first: 0x00028000, last: 0x0002DBB3, length: 0x00005BB4 }
- { first: 0x10001014, last: 0x1000101B, length: 0x00000008 }

- file: 'mqaoa_SD_BL_13_3_a3a7fda.hex'
  data:
  - { first: 0x00000000, last: 0x00000AFF, length: 0x00000B00 }
  - { first: 0x00001000, last: 0x00018E4B, length: 0x00017E4C }
  - { first: 0x00019000, last: 0x0001F59F, length: 0x000065A0 }
  - { first: 0x00028000, last: 0x0002DBB3, length: 0x00005BB4 }
  - { first: 0x0002E000, last: 0x0002E327, length: 0x00000328 }
  - { first: 0x0002F000, last: 0x0002F327, length: 0x00000328 }
  - { first: 0x10001014, last: 0x1000101B, length: 0x00000008 }