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esp32: Add option to place.rtc_data and .rtc_rodata into the RTC_FAST segment

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Changes:
KConfig: The option CONFIG_ESP32_RTCDATA_IN_FAST_MEM is added in Kconfig file for esp32 component.
esp32.common.ld: added support of RTC_DATA_ATTR, RTC_RODATA_ATTR data placement into appropriate segment according to Kconfig option.
esp32.ld: linker script is modified to set alias for memory segment selected by Kconfig option to place data. The segments for force placement are added for RTC_FAST_ATTR, RTC_SLOW_ATTR attributes.
esp_attr.h: added new attributes RTC_FAST_ATTR, RTC_SLOW_ATTR for force placement into fest/slow memory.
test_rtc_fast.c: Added unit test cases to check data placement into appropriate memory segment.
Updated documentation for RTC_DATA_ATTR, RTC_FAST_ATTR, RTC_SLOW_ATTR in deep_sleep_stub.rst file.

TW#18001
Closes https://github.com/espressif/esp-idf/issues/1553
This commit is contained in:
Alex Lisitsyn
2018-03-22 18:39:19 +05:00
parent 5acf886324
commit ec5eb1e5c2
8 changed files with 387 additions and 8 deletions
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8
components/esp32/include/esp_attr.h
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@@ -44,9 +44,15 @@
// during a deep sleep / wake cycle.
#define RTC_DATA_ATTR __attribute__((section(".rtc.data")))
// Forces read-only data into RTC slow memory. See "docs/deep-sleep-stub.rst"
// Forces read-only data into RTC memory. See "docs/deep-sleep-stub.rst"
#define RTC_RODATA_ATTR __attribute__((section(".rtc.rodata")))
// Allows to place data into RTC_SLOW memory.
#define RTC_SLOW_ATTR __attribute__((section(".rtc.force_slow")))
// Allows to place data into RTC_FAST memory.
#define RTC_FAST_ATTR __attribute__((section(".rtc.force_fast")))
// Forces data into noinit section to avoid initialization after restart.
#define __NOINIT_ATTR __attribute__((section(".noinit")))