[STM32L471]: Cannot set option byte

[seeseemelk]

When attempting to unset the BFB2 bit from FLASH_OPTCR register, I get the following error:

$ st-flash --area=option read
st-flash 1.6.1-109-g781557d
2021-04-15T15:00:02 INFO common.c: L4xx: 96 KiB SRAM, 512 KiB flash in at least 2 KiB pages.
fffff8aa
$ st-flash --area=option write 0xFFEFF8AA
st-flash 1.6.1-109-g781557d
2021-04-15T15:00:13 INFO common.c: L4xx: 96 KiB SRAM, 512 KiB flash in at least 2 KiB pages.
attempting to set option byte to 0, abort.

It seems that the st-flash utility is not quite correctly parsing its command line arguments, preventing the modification of special registers.

[seeseemelk]

This issue has been fixed by eff18d8, but as of writing this isn't yet in a released version which is why I encountered it.

[Nightwalker-87]

@seeseemelk: Please follow #906 before opening new tickets in future.

[Nightwalker-87]

Fixed by #1102.