Unable to combine COREDUMP_RTC_DATA_ATTR and RTC_NOINIT_ATTR (IDFGH-14676)

[ammaree]

Answers checklist.

• I have read the documentation ESP-IDF Programming Guide and the issue is not addressed there.
• I have updated my IDF branch (master or release) to the latest version and checked that the issue is present there.
• I have searched the issue tracker for a similar issue and not found a similar issue.

General issue report

We have been using RTC_NOINIT_ATTR successfully to preserve the contents of an STDOUT buffer in RTC slow RAM across reboots. This buffer allows us to view ESP_LOG messages generated just prior to a reboot or crash, or whilst a console was not connected, at a later stage.

We now would like to add this RTC slow RAM based STDOUT buffer to the COREDUMP image but cannot find a way to do this.

Since RTC_NOINIT_ATTR is primarily used during boot to disable the zero init of this memory area, and COREDUMP_RTC_DATA_ATTR is used at crash time to control memory area(s) included with the coredump info, theoretically we cannot see a reason why these 2 attributes cannot be combined.

Is there any way to achieve the effect of preserving the contents of this single memory block across reboots and also include it in coredumps?