如何将qboot裁剪到通用Bootloader的32k大小？

能关的都关了试试，不使用压缩，不使用finsh,不使用qled，syswatch

不使用 qboot ，实现很啰嗦。

关闭压缩,finsh,qled,syswatch后，
最终的rtconfig.h文件

#ifndef RT_CONFIG_H__
#define RT_CONFIG_H__
/* Generated by Kconfiglib (https://github.com/ulfalizer/Kconfiglib) */
/* RT-Thread Kernel */
#define RT_NAME_MAX 8
#define RT_ALIGN_SIZE 4
#define RT_THREAD_PRIORITY_32
#define RT_THREAD_PRIORITY_MAX 32
#define RT_TICK_PER_SECOND 1000
#define IDLE_THREAD_STACK_SIZE 256
#define RT_CONSOLEBUF_SIZE 256
/* Inter-Thread communication */
#define RT_USING_SEMAPHORE
#define RT_USING_MUTEX
#define RT_USING_MAILBOX
/* end of Inter-Thread communication */
/* Memory Management */
#define RT_USING_MEMPOOL
#define RT_USING_SMALL_MEM
#define RT_USING_HEAP
/* end of Memory Management */
/* Kernel Device Object */
#define RT_USING_DEVICE
/* end of Kernel Device Object */
#define RT_VER_NUM 0x40002
/* end of RT-Thread Kernel */
#define ARCH_ARM
#define RT_USING_CPU_FFS
#define ARCH_ARM_CORTEX_M
#define ARCH_ARM_CORTEX_M4
/* RT-Thread Components */
#define RT_USING_COMPONENTS_INIT
#define RT_USING_USER_MAIN
#define RT_MAIN_THREAD_STACK_SIZE 2048
#define RT_MAIN_THREAD_PRIORITY 10
/* C++ features */
/* end of C++ features */
/* Command shell */
/* end of Command shell */
/* Device virtual file system */
/* end of Device virtual file system */
/* Device Drivers */
#define RT_USING_DEVICE_IPC
#define RT_PIPE_BUFSZ 512
#define RT_USING_PIN
#define RT_USING_SPI
#define RT_USING_SFUD
#define RT_SFUD_USING_SFDP
#define RT_SFUD_USING_FLASH_INFO_TABLE
#define RT_SFUD_SPI_MAX_HZ 50000000
/* Using USB */
/* end of Using USB */
/* end of Device Drivers */
/* POSIX layer and C standard library */
/* end of POSIX layer and C standard library */
/* Network */
/* Socket abstraction layer */
/* end of Socket abstraction layer */
/* Network interface device */
/* end of Network interface device */
/* light weight TCP/IP stack */
/* end of light weight TCP/IP stack */
/* AT commands */
/* end of AT commands */
/* end of Network */
/* VBUS(Virtual Software BUS) */
/* end of VBUS(Virtual Software BUS) */
/* Utilities */
/* end of Utilities */
/* end of RT-Thread Components */
/* RT-Thread online packages */
/* IoT - internet of things */
/* Wi-Fi */
/* Marvell WiFi */
/* end of Marvell WiFi */
/* Wiced WiFi */
/* end of Wiced WiFi */
/* end of Wi-Fi */
/* IoT Cloud */
/* end of IoT Cloud */
/* end of IoT - internet of things */
/* security packages */
/* end of security packages */
/* language packages */
/* end of language packages */
/* multimedia packages */
/* end of multimedia packages */
/* tools packages */
/* end of tools packages */
/* system packages */
/* acceleration: Assembly language or algorithmic acceleration packages */
/* end of acceleration: Assembly language or algorithmic acceleration packages */
/* Micrium: Micrium software products porting for RT-Thread */
/* end of Micrium: Micrium software products porting for RT-Thread */
#define PKG_USING_FAL
#define FAL_DEBUG_CONFIG
#define FAL_DEBUG 1
#define FAL_PART_HAS_TABLE_CFG
#define FAL_USING_SFUD_PORT
#define FAL_USING_NOR_FLASH_DEV_NAME "w25q128"
#define PKG_USING_FAL_V00500
#define PKG_FAL_VER_NUM 0x00500
#define PKG_USING_QBOOT
#define QBOOT_USING_PRODUCT_CODE
#define QBOOT_PRODUCT_CODE "00010203040506070809"
#define QBOOT_APP_PART_NAME "app"
#define QBOOT_DOWNLOAD_PART_NAME "download"
#define QBOOT_FACTORY_PART_NAME "factory"
#define QBOOT_USING_PRODUCT_INFO
#define QBOOT_PRODUCT_NAME "Qboot test device"
#define QBOOT_PRODUCT_VER "v1.00 2020.07.27"
#define QBOOT_PRODUCT_MCU "stm32F407"
#define QBOOT_USING_FACTORY_KEY
#define QBOOT_FACTORY_KEY_PIN 64
#define QBOOT_FACTORY_KEY_LEVEL 0
#define QBOOT_FACTORY_KEY_CHK_TMO 5
#define QBOOT_THREAD_STACK_SIZE 4096
#define QBOOT_THREAD_PRIO 5
#define PKG_USING_QBOOT_LATEST_VERSION
/* end of system packages */
/* peripheral libraries and drivers */
/* end of peripheral libraries and drivers */
/* AI packages */
/* end of AI packages */
/* miscellaneous packages */
/* samples: kernel and components samples */
/* end of samples: kernel and components samples */
#define PKG_USING_CRCLIB
#define CRCLIB_USING_CRC8
#define CRC8_USING_CONST_TABLE
#define CRC8_POLY_8C
#define CRC8_POLY 140
#define CRCLIB_USING_CRC16
#define CRC16_USING_CONST_TABLE
#define CRC16_POLY_A001
#define CRC16_POLY 40961
#define CRCLIB_USING_CRC32
#define CRC32_USING_CONST_TABLE
#define CRC32_POLY_EDB88320
#define CRC32_POLY 3988292384
#define PKG_USING_CRCLIB_V100
/* entertainment: terminal games and other interesting software packages */
/* end of entertainment: terminal games and other interesting software packages */
/* end of miscellaneous packages */
/* end of RT-Thread online packages */
/* samples: kernel and components samples */
/* end of samples: kernel and components samples */
#define RT_STUDIO_BUILT_IN
#endif
使用-Os编译选项
最终编译大小是

arm-none-eabi-objcopy -O ihex "rtthread.elf"  "rtthread.hex"
arm-none-eabi-size --format=berkeley "rtthread.elf"
   text       data        bss        dec        hex    filename
  29304        384       7048      36736       8f80    rtthread.elf
              Used Size(B)           Used Size(KB)
Flash:          29688 B               28.99 KB
RAM:             7432 B                7.26 KB
09:19:42 Build Finished. 0 errors, 27 warnings. (took 5s.236ms)

STM32L431使用QBoot，仅使用片内flash， 精简后的bootloadr大小为20.16KB，RAM占用12.41KB