NXP Semiconductors K32 L2A Series, Reference Manual, Page: 287 / 1379

Response: The target (KinetisBootloader) will return a GenericResponse packet with a
status code either set to kStatus_Success upon successful execution of the command, or
set to an appropriate error status code.
14.3.8.14 FillMemory command
The FillMemory command fills a range of bytes in memory with a data pattern. It follows
the same rules as the WriteMemory command. The difference between FillMemory and
WriteMemory is that a data pattern is included in FillMemory command parameter, and
there is no data phase for the FillMemory command, while WriteMemory does have a
data phase.
Table 14-45. Parameters for FillMemory Command
Byte # Command
0 - 3 Start address of memory to fill
4 - 7 Number of bytes to write with the pattern
• The start address should be 32-bit aligned.
• The number of bytes must be evenly divisible by 4.
8 - 11 32-bit pattern
• To fill with a byte pattern (8-bit), the byte must be replicated 4 times in the 32-bit
pattern.
• To fill with a short pattern (16-bit), the short value must be replicated 2 times in the
32-bit pattern.
For example, to fill a byte value with 0xFE, the word pattern would be 0xFEFEFEFE; to
fill a short value 0x5AFE, the word pattern would be 0x5AFE5AFE.
Special care must be taken when writing to flash.
• First, any flash sector written to must have been previously erased with a
FlashEraseAll, FlashEraseRegion, or FlashEraseAllUnsecure command.
• Writing to flash requires the start address to be 32-bit or 64-bit aligned .
• If the VerifyWrites property is set to true, then writes to flash will also perform a
flash verify program operation.
When writing to RAM, the start address need not be aligned, and the data will not be
padded.
Chapter 14 Kinetis ROM Bootloader
K32 L2A Reference Manual, Rev. 2, 01/2020
NXP Semiconductors 287