就是做LED闪烁的实验：
STM32CubeProgrammer 使用的版本是
一直卡在下载进度不动
使用ram方式能让LED正常的闪烁
串口连接上显示
U-Boot 2020.01-stm32mp-r1 (Aug 12 2020 - 02:17:04 +0000)
CPU: STM32MP157AAC Rev.Z
Model: 100ASK ASK-STM32MP157-512D PRO V1 Board
Board: stm32mp1 in trusted mode (st,stm32mp157c-100ask-512d-v1)
DRAM: 512 MiB
Clocks:
- MPU : 650 MHz
- MCU : 208.878 MHz
- AXI : 266.500 MHz
- PER : 24 MHz
- DDR : 533 MHz
WDT: Started with servicing (32s timeout)
NAND: 0 MiB
MMC: STM32 SD/MMC: 0, STM32 SD/MMC: 1
In: serial
Out: serial
Err: serial
Net: eth0: ethernet@5800a000
Press SPACE to abort autoboot in 0 seconds
Boot over usb0!
partitions : Writing GPT: success!
done
DFU alt info setting: done
crq->brequest:0x0
crq->brequest:0x0
#
UPLOAD ... done
Ctrl+C to exit ...
dfu_write: Wrong sequence number! [0] [-2]