ldube opened a new pull request, #19422:
URL: https://github.com/apache/nuttx/pull/19422
## Summary
This commit introduces a rudimentary architecture and board port for the
MIPS Creator CI20, featuring the dual core Ingenic JZ4780 SoC (MIPS32).
Included in this initial implementation:
- Basic architectural initialization and startup code for the JZ4780 Core 0.
- Minimal configuration required to execute from RAM.
- Early UART/serial console support for basic debugging and NSH output.
- Minimal board-specific configuration for the CI20 target.
- Console output is routed via UART0 on the expansion header.
This establishes basic support for running NuttX on the MIPS CI20. Further
peripherals, optimization, and extended documentation are left for future
iterations or community contributions.
Build and Runtime Deployment Info:
----------------------------------
The baseline can be configured, compiled using the MIPS MTI toolchain, and
loaded via U-Boot using the following commands (replace <tftp_dir> with your
local TFTP root directory).
./tools/configure.sh -l ci20/nsh
make CROSSDEV=mips-mti-elf-
mkimage -A mips -O linux -T kernel -C none -a 0x80000180 -e 0x800004ac \
-n "nx" -d nuttx.bin <tftp_dir>/nuttx.umg
Note: U-Boot must be properly configured for networking (e.g., valid ipaddr,
serverip, and ethaddr environment variables) to fetch the image over TFTP.
Run this from U-Boot prompt:
tftp nuttx.umg && bootm $fileaddr
## Testing
The port has been verified on target hardware. The system successfully boots
from RAM into the NuttShell (NSH) via the serial console, with the scheduler
running normally:
NuttShell (NSH) NuttX-13.0.0
nsh> ps
TID PID PPID PRI POLICY TYPE NPX STATE EVENT SIGMASK
STACK COMMAND
0 0 0 0 FIFO Kthread - Ready
0000000000000000 0002024 <noname>
1 0 0 50 RR Kthread - Waiting Semaphore
0000000000000000 0001976 <noname> 0x800589b8 0x80058a08
3 3 0 100 RR Task - Running
0000000000000000 0002004 <noname>
nsh>
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