Merge branch 'master' of github.com:texane/stlink

* 'master' of github.com:texane/stlink:
  Update README

README

@@ -251,6 +251,79 @@ of the flash:
 
 Issue(s): [#356](https://github.com/texane/stlink/issues/356)
 
+### Stlink serial corrupts after one probe
+
+`lsusb -v` before `st-info --probe` with STM32 L1 Discovery board. With stlink firmware `V2.J16.S0`:
+
+```
+Bus 001 Device 004: ID 0483:3748 STMicroelectronics ST-LINK/V2
+Device Descriptor:
+  bLength                18
+  bDescriptorType         1
+  bcdUSB               2.00
+  bDeviceClass            0 (Defined at Interface level)
+  bDeviceSubClass         0
+  bDeviceProtocol         0
+  bMaxPacketSize0        64
+  idVendor           0x0483 STMicroelectronics
+  idProduct          0x3748 ST-LINK/V2
+  bcdDevice            1.00
+  iManufacturer           1 STMicroelectronics
+  iProduct                2 STM32 STLink
+  iSerial                 3 Pÿk^FPgRUB1^C<U+0087
+```
+
+`st-info --probe` :
+
+```
+ ./st-info --probe
+Found 1 stlink programmers
+ serial: 503f6b06506752554231033f
+openocd: "\x50\x3f\x6b\x06\x50\x67\x52\x55\x42\x31\x03\x3f"
+  flash: 262144 (pagesize: 256)
+   sram: 32768
+ chipid: 0x0427
+  descr: L1 Medium-Plus-density device
+```
+
+`lsusb -v` after probe:
+
+```
+Bus 001 Device 004: ID 0483:3748 STMicroelectronics ST-LINK/V2
+Device Descriptor:
+  bLength                18
+  bDescriptorType         1
+  bcdUSB               2.00
+  bDeviceClass            0 (Defined at Interface level)
+  bDeviceSubClass         0
+  bDeviceProtocol         0
+  bMaxPacketSize0        64
+  idVendor           0x0483 STMicroelectronics
+  idProduct          0x3748 ST-LINK/V2
+  bcdDevice            1.00
+  iManufacturer           1 STMicroelectronics
+  iProduct                2 STM32 STLink
+  iSerial                 3 000000000001
+  bNumConfigurations      1
+```
+
+`st-info --probe` second time, with "corrupt serial".
+
+```
+./st-info --probe
+Found 1 stlink programmers
+ serial: 303030303030303030303031
+openocd: "\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x30\x31"
+  flash: 262144 (pagesize: 256)
+   sram: 32768
+ chipid: 0x0427
+  descr: L1 Medium-Plus-density device
+```
+
+**Solution**
+
+Upgrade firmware from `V2.J16.S0` to `V2.J25.S0`
+
 ## Contributing and versioning
 
 * The semantic versioning scheme is used. Read more at [semver.org](http://semver.org)