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Lee Lup Yuen 2023-11-24 18:35:11 +08:00
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@ -2996,6 +2996,51 @@ To load the ELF File: [__ELF Loader g_elfbinfmt__](https://github.com/apache/nut
There's plenty happening inside [__Execute Module: exec_module__](https://github.com/apache/nuttx/blob/master/binfmt/binfmt_execmodule.c#L190-L450). But we won't explore today.
# UART Interrupt for Ox64 BL808
TODO: UART Interrupts not triggered
Show the UART Interrupt Status...
```text
bl602_attach: BL602_UART_INT_STS=0x84
bl602_attach: BL602_UART_INT_MASK=0xfff
bl602_attach: BL602_UART_INT_CLEAR=0x0
bl602_attach: BL602_UART_INT_EN=0xfff
```
[(Source)](https://gist.github.com/lupyuen/c3f187af9f5c81594ddf8f854de2ed0a)
"urx_fer_int = 1" means "UART RX FIFO error interrupt, auto-cleared when FIFO overflow/underflow error flag is cleared"
We clear the RX FIFO Underflow, still no UART Interrupts...
```text
bl602_attach: BL602_UART_FIFO_CONFIG_0=0x80
bl602_attach: BL602_UART_FIFO_CONFIG_0=0x8
```
We dump the PLIC and UART Registers in U-Boot...
```bash
## UART Registers
md 0x30002000 0x100
## PLIC Interrupt Priority
md 0xe0000004 1023
## PLIC Hart 0 S-Mode Interrupt Enable
md 0xe0002080 2
## PLIC Hart 0 S-Mode Priority Threshold
md 0xe0201000 2
## PLIC Hart 0 S-Mode Claim / Complete
md 0xe0201004 2
```
TODO
# Documentation for Ox64 BL808
![Pine64 Ox64 64-bit RISC-V SBC (Sorry for my substandard soldering)](https://lupyuen.github.io/images/ox64-solder.jpg)