NXP Semiconductors K32 L2A Series, Reference Manual, Page: 257 / 1379

} bootloader_tree_t;
The prototype of the entry point is:
void run_bootloader(void * arg);
The
arg
parameter is currently unused, and is intended for future expansion (for example,
passing options to the bootloader). To ensure future compatibility, a value of NULL
should be passed for
arg
.
Example: code to get the entry pointer address from the ROM and start the bootloader.
NOTE
This entry must be called in supervisor (privileged) mode.
// Variables
uint32_t runBootloaderAddress;
void (*runBootloader)(void * arg);
// Read the function address from the ROM API tree.
runBootloaderAddress = **(uint32_t **)(0x1c00001c);
runBootloader = (void (*)(void * arg))runBootloaderAddress;
// Start the bootloader.
runBootloader(NULL);
14.3.6 Bootloader Protocol
This section explains the general protocol for the packet transfers between the host and
the Kinetis Bootloader. The description includes the transfer of packets for different
transactions, such as commands with no data phase and commands with incoming or
outgoing data phase. The next section describes various packet types used in a
transaction.
Each command sent from the host is replied to with a response command.
Commands may include an optional data phase:
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 257