pyocd cannot flash .bin if there only flash alogrithm defined in .pdsc

The DFP packs works well with keil, but use pyocd it report no identifiable boot memory.
Looks pyocd cannot recognize the flash algo as flash memory.

Device family definition in DFP pack:

  <devices>
    <family Dfamily="LPC54018M" Dvendor="NXP:11">
      <description>The LPC540xx are ARM Cortex-M4 based microcontrollers for embedded applications. These devices include an ARM Cortex-M4 coprocessor, up to 360 KB of on-chip SRAM, full-speed and high speed USB device interface with Crystal-less operation, a DMIC subsystem with PDM microphone interface and I²S, five general-purpose timers, one SCTimer/PWM, one RTC/alarm timer, one 24-bit Multi-Rate Timer (MRT), a Windowed Watchdog Timer (WWDT), eight flexible serial communication peripherals (each of which can be a USART, SPI, or I²C interface), and one 12-bit 5.0 Msamples/sec ADC, and a temperature sensor. The ARM Cortex-M4 is a 32-bit core that offers system enhancements such as low power consumption, enhanced debug features, and a high level of support block integration. The ARM Cortex-M4 CPU incorporates a 3-stage pipeline, uses a Harvard architecture with separate local instruction and data buses as well as a third bus for peripherals, and includes an internal prefetch unit that supports speculative branching. The ARM Cortex-M4 supports single-cycle digital signal processing and SIMD instructions. A hardware floating-point unit is integrated in the core.</description>
      <device Dname="LPC54018M">
        <processor Dcore="Cortex-M4" Dfpu="SP_FPU" Dmpu="MPU" Dendian="Little-endian" Dclock="180000000"/>
        <environment name="iar">
          <file category="linkerfile" name="iar/LPC54018M_spifi_flash.icf"/>
        </environment>
        <memory name="SRAMX" start="0x00000000" size="0x030000" access="rw" default="1"/>
        <memory name="SRAM_0_1_2_3" start="0x20000000" size="0x028000" access="rw" default="1"/>
        <memory name="USB_RAM" start="0x40100000" size="0x2000" access="rw" default="1"/>
        <algorithm name="arm/LPC540xx_W25Q32JVWJX.FLM" start="0x10000000" size="0x00400000" RAMstart="0x20000000" RAMsize="0x00001000" default="1"/>
        <debug svd="LPC54018M.xml"/>
        <variant Dvariant="LPC54018J2MET180">
          <compile header="fsl_device_registers.h" define="CPU_LPC54018J2MET180"/>
        </variant>
        <variant Dvariant="LPC54018J4MET180">
          <compile header="fsl_device_registers.h" define="CPU_LPC54018J4MET180"/>
        </variant>
      </device>
    </family>
  </devices>

$pyocd flash hello_world.bin --pack C:/NXP/LPC54018M_DFP.12.1.0.pack -t LPC54018J2MET180
0001293:WARNING:cmsis_pack:CMSIS-Pack device LPC54018J2MET180 has no identifiable boot memory
0001643:CRITICAL:__main__:No boot memory is defined for this device
Traceback (most recent call last):
  File "c:\mycode\pyocd\pyocd\__main__.py", line 398, in run
    self._COMMANDS[self._args.cmd](self)
  File "c:\mycode\pyocd\pyocd\__main__.py", line 575, in do_flash
    file_format=self._args.format)
  File "c:\mycode\pyocd\pyocd\flash\file_programmer.py", line 157, in program
    self._format_handlers[file_format](file_obj, **kwargs)
  File "c:\mycode\pyocd\pyocd\flash\file_programmer.py", line 170, in _program_bin
    raise exceptions.TargetSupportError("No boot memory is defined for this device")
TargetSupportError: No boot memory is defined for this device

$ pyocd flash hello_world.bin --pack C:/NXP/LPC54018M_DFP.12.1.0.pack -t LPC54018J2MET180 -a 0x10000000
0001065:WARNING:cmsis_pack:CMSIS-Pack device LPC54018J2MET180 has no identifiable boot memory
0001417:CRITICAL:__main__:no memory region defined for address 0x10000000
Traceback (most recent call last):
  File "c:\mycode\pyocd\pyocd\__main__.py", line 398, in run
    self._COMMANDS[self._args.cmd](self)
  File "c:\mycode\pyocd\pyocd\__main__.py", line 575, in do_flash
    file_format=self._args.format)
  File "c:\mycode\pyocd\pyocd\flash\file_programmer.py", line 157, in program
    self._format_handlers[file_format](file_obj, **kwargs)
  File "c:\mycode\pyocd\pyocd\flash\file_programmer.py", line 176, in _program_bin
    self._loader.add_data(address, data)
  File "c:\mycode\pyocd\pyocd\flash\loader.py", line 115, in add_data
    raise ValueError("no memory region defined for address 0x%08x" % address)
ValueError: no memory region defined for address 0x10000000

Reproduce the failure with the two pyocd flash commands and the supplied LPC54018M DFP pack. Start in pyocd/flash/file_programmer.py and pyocd/flash/loader.py, then trace the device memory handling from the warning in main.py. Done means the pack's algorithm-backed 0x10000000 region is recognized and the .bin command no longer reports missing boot memory or an undefined region.