---
** [tickets:#204] st-link can't flash stm32f2x based flash without target
algorithms**
**Status:** new
**Milestone:** 0.9.0
**Created:** Tue Aug 21, 2018 06:25 PM UTC by Cody Schafer
**Last Updated:** Tue Aug 21, 2018 06:25 PM UTC
**Owner:** nobody
The st-link driver only supports 8-bit and 32-bit writes (splitting smaller
ones into 8-bit writes).
The stm32f2x flash driver uses 16-bit writes, and the underlying hardware emits
an error if non-matching (so non-16-bit) writes occur.
As a result, when using a st-link with a device including stm32f2x flash,
non-algorithm programming is expected to always fail with a PGEPRR (programming
parallism error).
Discovered while investigating https://sourceforge.net/p/openocd/tickets/203/
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