87c9a0ee76
Previously k230 kernel build needs OpenSBI wrapping for use on target, thus leading to larger program and memory overheads. This patch adds alternative small overhead kernel build support. Changes: - in arch/risc-v/src/k230: - k230_head.S entrance renamed for sake of NUTTSBI - k230_irq.c add M-mode handling for NUTTSBI case - k230_mm_init.c add L3 table for smaller RAM case - hardware/k230_plic.h add PLIC_CTRL definition - Make.defs use CHIP_ASRCS to fix entrance selection - in boards/risc-v/canmv230/scripts: - Make.defs add support for NUTTSBI case Additions: - in boards/riscv/canmv230/: - scripts/ld-nuttsbi.script link script for NUTTSBI case - configs/nsbi/defconfig config for NUTTSBI case The artifact nuttx.bin from this configuration can be used directly on target as OpenSBI wrapping is not needed. Signed-off-by: Yanfeng Liu <yfliu2008@qq.com> fix typo
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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