我有一块全新的STM32 L1探索板，但它似乎坏了。但我并不完全确定。
将板子通过USB连接到Linux机器时，板子可以正常启动，并且演示程序也像供应商描述的那样运行良好。
但是，我无法真正连接到这个板子。
➜ lsusb -s 002:074
Bus 002 Device 074: ID 0483:3748 STMicroelectronics ST-LINK/V2
看起来板子已经连接好了，大跳线（CN3）设置为DISCOVERY以在ST-LINK和DISCOVERY之间切换。但是当我尝试使用ST-Link实用程序时，我收到以下信息。
➜ stlink git:(master) ./st-flash --reset erase
libusb_handle_events() timeout
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
2015-12-25T19:24:57 INFO src/stlink-common.c: Loading device parameters....
libusb_submit_transfer(-6)
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
libusb_submit_transfer(-6)
[!] send_recv
2015-12-25T19:24:57 WARN src/stlink-common.c: unknown chip id! 0
fish: Job 1, './st-flash --reset erase' terminated by signal SIGSEGV (Address boundary error)
此外，OpenOCD无法与该板进行通信。
openocd -f board/stm32ldiscovery.cfg
Open On-Chip Debugger 0.9.0 (2015-12-25-18:43)
Licensed under GNU GPL v2
For bug reports, read
http://openocd.org/doc/doxygen/bugs.html
adapter speed: 300 kHz
adapter_nsrst_delay: 100
Info : The selected transport took over low-level target control. The results might differ compared to plain JTAG/SWD
none separate
srst_only separate srst_nogate srst_open_drain connect_deassert_srst
Info : Unable to match requested speed 300 kHz, using 240 kHz
Info : Unable to match requested speed 300 kHz, using 240 kHz
Info : clock speed 240 kHz
Error: reset device failed
in procedure 'init'
in procedure 'ocd_bouncer'
芯片板上的芯片是STM32L152RCT6。我之前使用过STM32F0..4，从未遇到过这样的问题，但我之前没有使用过L系列，所以我不确定这是板子的问题还是我在这里漏掉了重要的东西。
编辑：使用OpenOCD，我发现了意外的行为。在第一次运行时，我收到了错误消息：
Error: init mode failed (unable to connect to the target)
第二次运行时：
Error: reset device failed
然后设备从系统中消失，
dmesg 留下了消息:[ 1336.080239] usb 2-1.1: reset full-speed USB device number 4 using ehci-pci
[ 1336.154250] usb 2-1.1: device descriptor read/64, error -32
[ 1336.329341] usb 2-1.1: device descriptor read/64, error -32
[ 1336.503334] usb 2-1.1: reset full-speed USB device number 4 using ehci-pci
[ 1336.566330] usb 2-1.1: device descriptor read/64, error -32
[ 1336.741385] usb 2-1.1: device descriptor read/64, error -32
[ 1336.915427] usb 2-1.1: reset full-speed USB device number 4 using ehci-pci
[ 1337.317517] usb 2-1.1: device not accepting address 4, error -32
[ 1337.390532] usb 2-1.1: reset full-speed USB device number 4 using ehci-pci
[ 1337.792623] usb 2-1.1: device not accepting address 4, error -32
[ 1337.793110] usb 2-1.1: USB disconnect, device number 4
[ 1337.855642] usb 2-1.1: new full-speed USB device number 5 using ehci-pci
[ 1337.918651] usb 2-1.1: device descriptor read/64, error -32
[ 1338.093691] usb 2-1.1: device descriptor read/64, error -32
[ 1338.267730] usb 2-1.1: new full-speed USB device number 6 using ehci-pci
[ 1338.330727] usb 2-1.1: device descriptor read/64, error -32
[ 1338.505783] usb 2-1.1: device descriptor read/64, error -32
[ 1338.679823] usb 2-1.1: new full-speed USB device number 7 using ehci-pci
[ 1339.081921] usb 2-1.1: device not accepting address 7, error -32
[ 1339.154935] usb 2-1.1: new full-speed USB device number 8 using ehci-pci
[ 1339.557024] usb 2-1.1: device not accepting address 8, error -32
[ 1339.557168] usb 2-1-port1: unable to enumerate USB device
我认为适配器速度可能存在问题，但目前不确定。
编辑2：我已经尝试使用Windows ST Link实用程序，但无法连接到板子，板子导致“检测错误”或“连接错误”，软件建议更改SWD频率或模式。我尝试了每个组合，但都没有效果。
编辑3：如果这对某人有所帮助，板子已经退回，我得到的信息是它实际上是坏的，我得到了一个新的。新的工作如预期的那样完美无缺。