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Commands are provided to write to memory (internal flash or RAM), erase flash, and
get/set bootloader options and property values. The host application can query the set of
available commands.
On start-up, the bootloader reads optional configuration parameters from a fixed area on
flash called the bootloader configuration area (BCA). These parameters can be modified
by the write memory command or by downloaded flash image. BCA parameters include
configuration data such as enabled peripherals, peripheral-specific settings, etc.
This chapter describes Kinetis Bootloader features, functionality, command structure and
which peripherals are supported.
Features supported by the Kinetis Bootloader in Kinetis ROM:
• Supports USB, LPI2C, LPSPI, and LPUART peripheral interfaces
• Automatic detection of the active peripheral
• Ability to disable any peripheral
• LPUART peripheral implements autobaud
• Common packet-based protocol for all peripherals
• Packet error detection and retransmission
• Flash-resident configuration options
• Fully supports internal flash security, including ability to mass erase or unlock
security via the backdoor key
• Protection of RAM used by the bootloader while it is running
• Provides command to read properties of the device, such as flash and RAM size
• Multiple options for executing the bootloader either at system start-up or under
application control at runtime
• Supports internal flash
• Supports serial QuadSPI memories
• Supports encrypted image download
Table 14-2. Commands supported by the Kinetis Bootloader in ROM
Command
Description
When flash security is
enabled, then this command is
Call
Runs user application code and returns control to
bootloader
Not supported
Execute
Run user application code that never returns control to
the bootloader
Not supported
FillMemory
Fill a range of bytes in flash with a word pattern
Not supported
FlashEraseAll
Erase the entire flash array
Not supported
FlashEraseRegion
Erase a range of sectors in flash
Not supported
WriteMemory
Write data to memory
Not supported
ReadMemory
Read data from memory
Not supported
Table continues on the next page...
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors
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