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Clean up
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1 changed files with 29 additions and 23 deletions
52
README.md
52
README.md
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@ -3374,7 +3374,7 @@ TODO: Boot from MicroSD with Initial RAM Disk
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From the previous section, we found out that NuttX Shell didn't appear on Star64 JH7110 SBC.
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When we log [`uart_write`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial.c#L1172-L1341), we see that the NuttX Shell is actually started!
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When we log [`uart_write`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial.c#L1172-L1341), we see that the NuttX Shell is actually started!
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```text
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uart_write (0xc000a610):
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@ -3394,9 +3394,7 @@ Let's find out why, by tracing the UART Output in NuttX QEMU...
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# UART Output in NuttX QEMU
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TODO
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From QEMU:
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To understand how UART Output works in NuttX Apps (and NuttX Shell), we add logs to NuttX QEMU...
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```text
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ABCnx_start: Entry
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@ -3452,31 +3450,43 @@ $%^&riscv_doirq: irq=35
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#*ADEFa$%&riscv_doirq: irq=8
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```
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[`uart_write`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial.c#L1172-L1341) calls...
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This says that NuttX Apps will call [`uart_write`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial.c#L1172-L1341), which calls...
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- `A`: [`uart_putxmitchar`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial.c#L150-L286) calls...
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- `A`: [`uart_putxmitchar`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial.c#L150-L286) which calls...
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- `D`: [`uart_xmitchars`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial_io.c#L42-L107) calls...
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- `D`: [`uart_xmitchars`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial_io.c#L42-L107) which calls...
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- `E`: [`uart_txready`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial_io.c#L63-L68) and...
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- `E`: [`uart_txready`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial_io.c#L63-L68) and...
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`F`: [`u16550_send`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/uart_16550.c#L1542-L1556)
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`F`: [`u16550_send`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/uart_16550.c#L1542-L1556)
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UART Input will trigger UART Interrupt...
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When we type something, the UART Input will trigger an Interrupt...
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- `$`: [`exception_common`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/arch/risc-v/src/common/riscv_exception_common.S#L63-L189) calls...
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(Also for NuttX Apps calling a System Function in NuttX Kernel)
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- `#`: [`u16550_interrupt`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/uart_16550.c#L918-L1021) calls...
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- `$`: [`exception_common`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/src/common/riscv_exception_common.S#L63-L189) calls...
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- `%^&`: [`riscv_dispatch_irq`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/arch/risc-v/src/qemu-rv/qemu_rv_irq_dispatch.c#L51-L92) calls...
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- `#`: [`u16550_interrupt`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/uart_16550.c#L918-L1021) which calls...
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- [`riscv_doirq`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/arch/risc-v/src/common/riscv_doirq.c#L58-L131)
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- `%^&`: [`riscv_dispatch_irq`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/src/qemu-rv/qemu_rv_irq_dispatch.c#L51-L92) which calls...
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QEMU UART is [RISC-V IRQ 10](https://github.com/lupyuen/nuttx-star64/blob/main/qemu-riscv64.dts#L225-L226), which becomes NuttX IRQ 35 (10 + 25).
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- [`riscv_doirq`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/src/common/riscv_doirq.c#L58-L131)
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(RISCV_IRQ_EXT = RISCV_IRQ_SEXT = 16 + 9)
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_What is `riscv_doirq: irq=35`?_
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IRQ 8 is RISCV_IRQ_ECALLU: ECALL from User Mode to Supervisor Mode
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This is the Interrupt triggered by UART Input.
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QEMU UART is at [RISC-V IRQ 10](https://github.com/lupyuen/nuttx-star64/blob/main/qemu-riscv64.dts#L225-L226), which becomes NuttX IRQ 35 (10 + 25).
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[(RISCV_IRQ_EXT = RISCV_IRQ_SEXT = 16 + 9 = 25)](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/include/irq.h#L75-L86)
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_Why so many `riscv_doirq: irq=8`?_
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NuttX IRQ 8 is [`RISCV_IRQ_ECALLU`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/include/irq.h#L52-L74): ECALL from RISC-V User Mode to Supervisor Mode.
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This happens when the NuttX App (User Mode) calls a System Function in NuttX Kernel (Supervisor Mode).
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Now we compare the above with Star64...
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# Compare UART Output: Star64 vs QEMU
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@ -3531,9 +3541,9 @@ AAAD$%&riscv_doirq: irq=8
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nx_start: CPU0: Beginning Idle Loop
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```
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[`uart_txready`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/serial_io.c#L63-L68) is NOT Ready, that's why it doesn't call [`u16550_send`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/drivers/serial/uart_16550.c#L1542-L1556)
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[`uart_txready`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/serial_io.c#L63-L68) is NOT Ready, that's why it doesn't call [`u16550_send`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/drivers/serial/uart_16550.c#L1542-L1556)
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`$`: [`exception_common`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64d/arch/risc-v/src/common/riscv_exception_common.S#L63-L189) is called for IRQ 8 RISCV_IRQ_ECALLU: ECALL from User Mode to Supervisor Mode
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`$`: [`exception_common`](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/ramdisk2/arch/risc-v/src/common/riscv_exception_common.S#L63-L189) is called for IRQ 8 RISCV_IRQ_ECALLU: ECALL from User Mode to Supervisor Mode
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- Is our [__Interrupt Controller__](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64c/arch/risc-v/src/qemu-rv/hardware/qemu_rv_memorymap.h#L27-L33) OK?
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@ -3842,10 +3852,6 @@ up_enable_irq: irq=57
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up_enable_irq: extirq=32, RISCV_IRQ_EXT=25
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```
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TODO
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TODO: Check PolarFire Icicle
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https://lupyuen.github.io/articles/privilege#other-risc-v-ports-of-nuttx
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