Huang Qi
6695affe87
The number of exception for risc-v is 16 (0 ~ 15) for the machine ISA version 1.12 or earlier, the number of exception is 20 (0 ~ 19) from the ISA version 1.13. And maybe changed in the future. Using a dedicated option to control the exception number to allow the earlier version chip with customized exception number (e.g. 16 ~ 19 used) to define the exception reason string correctly. Signed-off-by: Huang Qi <huangqi3@xiaomi.com>
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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