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Add UART

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Lee Lup Yuen 2023-06-29 19:44:48 +08:00
parent fc73ef1d9e
commit 3b2bf55fc9
1 changed files with 37 additions and 6 deletions
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43
README.md
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@ -755,17 +755,17 @@ Usernames and Passwords are...
TODO
From [System Memory Map](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/system_memory_map.html):
UART0 is at 0x00_1000_0000
[System Memory Map](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/system_memory_map.html)
From [UART Device Tree](https://doc-en.rvspace.org/VisionFive2/DG_UART/JH7110_SDK/general_uart_controller.html):
Register base address "0x10000000" and range "0x10000"
[UART Device Tree](https://doc-en.rvspace.org/VisionFive2/DG_UART/JH7110_SDK/general_uart_controller.html)
UART Register base address "0x10000000" and range "0x10000"
[UART Datasheet](https://doc-en.rvspace.org/JH7110/Datasheet/JH7110_DS/uart.html)
[u16550_send](https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L1539-L1553)
From [u16550_send](https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L1539-L1553):
```c
/****************************************************************************
@ -785,7 +785,7 @@ static void u16550_send(struct uart_dev_s *dev, int ch)
[u16550_serialout](https://github.com/apache/nuttx/blob/master/drivers/serial/uart_16550.c#L610-L624)
[UART_THR_OFFSET](https://github.com/apache/nuttx/blob/dc69b108b8e0547ecf6990207526c27aceaf1e2e/include/nuttx/serial/uart_16550.h#L172-L200) is 0
[UART_THR_OFFSET](https://github.com/apache/nuttx/blob/dc69b108b8e0547ecf6990207526c27aceaf1e2e/include/nuttx/serial/uart_16550.h#L172-L200) is 0:
```c
#define UART_THR_INCR 0 /* (DLAB =0) Transmit Holding Register */
@ -803,3 +803,34 @@ TODO: Embed Linux Kernel Header in QEMU
TODO: Set Kernel Start Address
TODO: Set UART Base Address
From https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/boards/risc-v/qemu-rv/rv-virt/configs/nsh64/defconfig#L10-L16
```text
CONFIG_16550_ADDRWIDTH=0
CONFIG_16550_UART0=y
CONFIG_16550_UART0_BASE=0x10000000
CONFIG_16550_UART0_CLOCK=3686400
CONFIG_16550_UART0_IRQ=37
CONFIG_16550_UART0_SERIAL_CONSOLE=y
CONFIG_16550_UART=y
```
UART Base Address is already `0x1000` `0000` yay!
TODO: Set CLINT and PLIC Addresses
From [U74 Memory Map](https://doc-en.rvspace.org/JH7110/TRM/JH7110_TRM/u74_memory_map.html):
```text
0x00_0200_0000 0x00_0200_FFFF RW A CLINT
0x00_0C00_0000 0x00_0FFF_FFFF RW A PLIC
```
TODO: We update [qemu_rv_memorymap.h](https://github.com/lupyuen2/wip-pinephone-nuttx/blob/star64/arch/risc-v/src/qemu-rv/hardware/qemu_rv_memorymap.h#L27-L33):
```c
#define QEMU_RV_CLINT_BASE 0x02000000
#define QEMU_RV_ACLINT_BASE 0x02f00000
#define QEMU_RV_PLIC_BASE 0x0c000000
```