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**[tickets:#402] STM32L43x Option Byte read/write error**

**Status:** new
**Milestone:** 0.10.0
**Created:** Tue Jun 20, 2023 09:34 AM UTC by Arney Sieling
**Last Updated:** Tue Jun 20, 2023 09:34 AM UTC
**Owner:** nobody


`stm32l4x option_read` and `stm32l4x option_write` uses incorrect base address 
(or at least for the STM32L43x family of MCUs, I did not verify the Option Byte 
addresses of other STM32L4x MCUs).

The base address currently used by OpenOCD for STM32L4x MCUs is `0x40022000`, 
this should be `0x1FFF7800`, and as a result any calls to `stm32l4x 
option_read` and `stm32l4x option_write` fails to read/write the option bytes 
of an STM32L43x MCU.


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