Cannot flash STM32L151 w Stlink/v2 on MAC

[JonesWest]

Hi,

I am trying to flash a an STM32L151 using Stlink/v2 on a Mac with OSX Sierra.
I've installed stlink 1.3.1 using homebrew as explained in the readme. I am now trying to flash the device:

$ st-flash write Bootloader.bin 0x08000000
st-flash 1.3.1
2017-05-19T14:13:37 INFO src/common.c: Loading device parameters....
2017-05-19T14:13:37 INFO src/common.c: Device connected is: L1 Medium-Plus-density device, id 0x10386427
2017-05-19T14:13:37 INFO src/common.c: SRAM size: 0x8000 bytes (32 KiB), Flash: 0x40000 bytes (256 KiB) in pages of 256 bytes
2017-05-19T14:13:37 INFO src/common.c: Attempting to write 37348 (0x91e4) bytes to stm32 address: 134217728 (0x8000000)
2017-05-19T14:13:37 WARN src/common.c: pecr.pelock not clear (0x7)
2017-05-19T14:13:37 ERROR src/common.c: Failed to erase_flash_page(0x8000000) == -1
stlink_fwrite_flash() == -1

My Stlink/v2 is running V2.J27.S6 JTAG+SWIM Debugger
And I've tried downgrading to V2.J17.S4, but it makes no difference.

Anyone?

[xor-gate]

Could you try a building a newer version from the master branch sources? And see if the problem remains?

[Nightwalker-87]

2017-05-19T14:13:37 WARN src/common.c: pecr.pelock not clear (0x7)

This indicates that the flash memory of the used device is locked.
Unlocking for this chip is possible since commit 751da60 / PR #847, which added support to write option bytes for the STM32L1 device family. An example how to make use of this feature with the st-flash command can be found in our project documentation in /doc/tutorial.md.
As this answer fully addresses this request for support, this issue is now closed as resolved.