57b8fc9954
This commit provides an interface to register ISRs that run from IRAM and keeps track of the non-IRAM interrupts. It enables, for instance, to avoid disabling all the interrupts during a SPI flash operation: IRAM-enabled ISRs are, then, able to run during these operations. It also makes the code look more similar to the ESP32-S3 SPI flash implementation by creating a common `esp32_spiflash_init` that is responsible to create the SPI flash operation tasks. The function intended to initialize the SPI flash partions was, then, renamed to `board_spiflash_init`.
Apache NuttX is a real-time operating system (RTOS) with an emphasis on standards compliance and small footprint. Scalable from 8-bit to 64-bit microcontroller environments, the primary governing standards in NuttX are POSIX and ANSI standards. Additional standard APIs from Unix and other common RTOSs (such as VxWorks) are adopted for functionality not available under these standards, or for functionality that is not appropriate for deeply-embedded environments (such as fork()).
For brevity, many parts of the documentation will refer to Apache NuttX as simply NuttX.
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