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Lee Lup Yuen 2024-05-08 18:20:23 +08:00
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@ -1073,6 +1073,39 @@ Duh we set the wrong UART0 IRQ! Here's the fix...
https://github.com/lupyuen2/wip-nuttx/commit/122c717447f81c310a4fb082101213ad338dfb0e
_How did we get IRQ 69 for UART?_
https://github.com/lupyuen2/wip-nuttx/commit/122c717447f81c310a4fb082101213ad338dfb0e
```bash
CONFIG_16550_UART0_IRQ=69
```
We saw this in the [SG2000 Reference Manual](https://github.com/sophgo/sophgo-doc/releases)...
> 3.1 Interrupt Subsystem
> Table 3.2: Interrupt number and Interrupt source mapping for Master RISCV C906 @ 1.0Ghz
> Int #44: UART0
Linx Device Tree also says UART0 IRQ is 44 (0x2C)...
```c
serial@04140000 {
compatible = "snps,dw-apb-uart";
reg = <0x00 0x4140000 0x00 0x1000>;
clock-frequency = <0x17d7840>;
reg-shift = <0x02>;
reg-io-width = <0x04>;
status = "okay";
interrupts = <0x2c 0x04>;
interrupt-parent = <0x04>;
};
```
Thus we compute [NuttX IRQ](https://lupyuen.github.io/articles/plic2#uart-interrupt) = 25 + RISC-V IRQ = 69
# NuttX Shell runs OK on SG2000
TODO: It works yay!