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Restore UART. Tested OK

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Lee Lup Yuen 2023-07-15 20:24:18 +08:00
parent 0336b82353
commit bbe658d8eb
1 changed files with 8 additions and 55 deletions
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@ -2101,18 +2101,20 @@ tools/configure.sh rv-virt:knsh64
And we bypassed M-Mode during init...
From [qemu_rv_start.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/arch/risc-v/src/qemu-rv/qemu_rv_start.c#L166-L231)
From [qemu_rv_start.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64a/arch/risc-v/src/qemu-rv/qemu_rv_start.c#L166-L231)
```c
void qemu_rv_start(int mhartid)
{
/// TODO: qemu_rv_clear_bss
// Clear BSS
DEBUGASSERT(mhartid == 0);
if (0 == mhartid) { qemu_rv_clear_bss(); }
/// Bypass to S-Mode Init
// Bypass to S-Mode Init
qemu_rv_start_s(mhartid);
/// Skip M-Mode Init
/// TODO: What about `satp`, `stvec`, `pmpaddr0`, `pmpcfg0`?
// Skip M-Mode Init
// TODO: What about `satp`, `stvec`, `pmpaddr0`, `pmpcfg0`?
...
}
```
@ -2290,56 +2292,7 @@ clk u5_dw_i2c_clk_apb already disabled
NuttX now hangs somewhere in `nx_start`
TODO: Trace `nx_start`
# Hang in UART Setup
TODO: `riscv_earlyserialinit` and `u16550_setup` hang
From [uart_16550.c](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/drivers/serial/uart_16550.c#L719-L792):
```c
//// This will hang!
#ifdef TODO ////
/* Set trigger */
*(volatile uint8_t *)0x10000000 = 'e';////
u16550_serialout(priv, UART_FCR_OFFSET,
(UART_FCR_FIFOEN | UART_FCR_RXTRIGGER_8));
/* Set up the IER */
*(volatile uint8_t *)0x10000000 = 'f';////
priv->ier = u16550_serialin(priv, UART_IER_OFFSET);
#endif //// TODO
...
//// This will hang!
#ifdef TODO ////
/* Enter DLAB=1 */
*(volatile uint8_t *)0x10000000 = 'g';////
u16550_serialout(priv, UART_LCR_OFFSET, (lcr | UART_LCR_DLAB));
/* Set the BAUD divisor */
div = u16550_divisor(priv);
u16550_serialout(priv, UART_DLM_OFFSET, div >> 8);
u16550_serialout(priv, UART_DLL_OFFSET, div & 0xff);
/* Clear DLAB */
u16550_serialout(priv, UART_LCR_OFFSET, lcr);
/* Configure the FIFOs */
*(volatile uint8_t *)0x10000000 = 'h';////
u16550_serialout(priv, UART_FCR_OFFSET,
(UART_FCR_RXTRIGGER_8 | UART_FCR_TXRST | UART_FCR_RXRST |
UART_FCR_FIFOEN));
#endif //// TODO
```
See previous section for the `CONFIG_16550_REGINCR`` fix.
Let's log the NuttX Scheduler...
# Enable Scheduler Logging