yf13 opened a new pull request, #11559:
URL: https://github.com/apache/nuttx/pull/11559
## Summary
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.
## Impact
K230/CanMV230 device
## Testing
Checked with CanMV230 device
## Thanks
- to @lupyuen for discussions on impact of UART IRQ to user app console
access behaviors
- to @pussuw for upstreaming NUTTSBI component
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