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**[tickets:#415] Watchpoints not fully functional on Cortex-A9**
**Status:** new
**Milestone:** 0.10.0
**Created:** Mon Sep 11, 2023 04:34 PM UTC by Ahmad Fatoum
**Last Updated:** Mon Sep 11, 2023 04:34 PM UTC
**Owner:** nobody
The support added in commit 1fb736f6c5a6 ("target/cortex_a: add support for
watchpoints") appears to be for CPUs with ARM debug architecture >= v7.1, like
Cortex-A7. On the older Cortex-A9, it doesn't work fully: The first access
indeed triggers the watchpoint, but if I remove the watchpoint, step a few
instructions after the instruction which triggered the watchpoint, readd the
watchpoint and resume, the watchpoint is immediately triggered again at the
current instruction. This happens whether using the shell over telnet or gdb.
I suspect this is because Cortex-A9 is ARM_DEBUG_ARCH_V7_ECP14. The Linux code
differs for it compared to Cortex-A7's ARM_DEBUG_ARCH_V7_1.
I was testing on an i.MX6Q running bare-metal firmware in THUMB2 mode.
It would be nice if OpenOCD could just refuse adding watchpoints on older CPUs.
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