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esp32: Add .noinit and .rtc_noinit sections to the linker script

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Added .rtc_noinit and .noinit section definitions into linker file /esp32/ld/esp32.common.ld.
The macro __NOINIT_ATTR, RTC_NOINIT_ATTR declared in esp32/esp_attr.h file.
Added unit test file to test added behavior for noinit variables and its attributes.
Added documentation changes for new added attributes.
Make some corrections after code review:
The linker file has been corrected to place noinit section before bss_start to make it safer.
Documentation file has been modified to clarify reset behavior of allocated data .
Corrected typos in test_noinit.c and removed assertion of noinit variable to avoid possible issues with ROM boot loader memory allocation.
The linker file has been corrected to place noinit section before bss_start to make it safer.
Documentation file has been modified to clarify reset behavior of allocated data .
Corrected typos in test_noinit.c and removed assertion of noinit variable to avoid possible issues with ROM boot loader memory allocation.
Update test_noinit.c file to address RTCWDT_RTC_RESET reset reason instead of POWERON_RESET.
Test optimized to pass automated unit testing.
esp32: Add .noinit and .rtc_noinit sections to the linker script
Update of general-notes.rst documentation to fomat examples as code and attributes as identifiers.
Test test_noinit.c corrected to pass automated testing (support ofTEST_CASE_MULTIPLE_STAGES())

https://ezredmine.espressif.cn:8765/issues/15878
This commit is contained in:
Alex Lisitsyn
2018-02-26 22:32:58 +05:00
parent f147a8d73d
commit 44b1bc0ab9
4 changed files with 176 additions and 4 deletions
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8
components/esp32/include/esp_attr.h
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@@ -47,4 +47,12 @@
// Forces read-only data into RTC slow memory. See "docs/deep-sleep-stub.rst"
#define RTC_RODATA_ATTR __attribute__((section(".rtc.rodata")))
// Forces data into noinit section to avoid initialization after restart.
#define __NOINIT_ATTR __attribute__((section(".noinit")))
// Forces data into RTC slow memory of .noinit section.
// Any variable marked with this attribute will keep its value
// after restart or during a deep sleep / wake cycle.
#define RTC_NOINIT_ATTR __attribute__((section(".rtc_noinit")))
#endif /* __ESP_ATTR_H__ */