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Update doc
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1 changed files with 73 additions and 51 deletions
124
README.md
124
README.md
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@ -770,14 +770,13 @@ CONFIG_16550_REGINCR=4
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CONFIG_16550_UART0=y
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CONFIG_16550_UART0_BASE=0x04140000
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CONFIG_16550_UART0_CLOCK=23040000
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CONFIG_16550_UART0_IRQ=44
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CONFIG_16550_UART0_SERIAL_CONSOLE=y
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CONFIG_16550_UART=y
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CONFIG_16550_WAIT_LCR=y
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CONFIG_SERIAL_UART_ARCH_MMIO=y
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```
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Try not to update the NuttX Config File directly! We ran `make menuconfig` to generate the above file...
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Don't update the NuttX Config File directly! We ran `make menuconfig` to generate the above file...
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```bash
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## Update NuttX Config
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@ -789,7 +788,13 @@ make menuconfig \
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To find the menuconfig settings: Press "`/`" and enter the name of the setting, like "16550_ADDRWIDTH". This ensures that the Kconfig Dependencies are correctly updated.
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_How did we get IRQ 44 for UART?_
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_How did we get IRQ 69 for UART?_
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https://github.com/lupyuen2/wip-nuttx/commit/122c717447f81c310a4fb082101213ad338dfb0e
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```bash
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CONFIG_16550_UART0_IRQ=69
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```
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We saw this in the [SG2000 Reference Manual](https://github.com/sophgo/sophgo-doc/releases)...
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@ -799,6 +804,23 @@ We saw this in the [SG2000 Reference Manual](https://github.com/sophgo/sophgo-do
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> Int #44: UART0
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Linx Device Tree also says UART0 IRQ is 44 (0x2C)...
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```c
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serial@04140000 {
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compatible = "snps,dw-apb-uart";
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reg = <0x00 0x4140000 0x00 0x1000>;
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clock-frequency = <0x17d7840>;
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reg-shift = <0x02>;
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reg-io-width = <0x04>;
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status = "okay";
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interrupts = <0x2c 0x04>;
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interrupt-parent = <0x04>;
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};
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```
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Thus we compute [NuttX IRQ](https://lupyuen.github.io/articles/plic2#uart-interrupt) = 25 + RISC-V IRQ = 69
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TODO: Fix the UART Clock: 16550_UART0_CLOCK
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# Enable Logging for NuttX Scheduler and Binary Loader
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@ -953,65 +975,65 @@ We dumped the SG2000 Linux Device Tree. Let's extract the Interrupt Controller t
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Based on the SG2000 Device Tree: [cv181x_milkv_duos_sd.dts](cv181x_milkv_duos_sd.dts)
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```c
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cpus {
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#address-cells = <0x01>;
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#size-cells = <0x00>;
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timebase-frequency = <0x17d7840>;
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cpus {
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#address-cells = <0x01>;
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#size-cells = <0x00>;
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timebase-frequency = <0x17d7840>;
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cpu-map {
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cpu-map {
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cluster0 {
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cluster0 {
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core0 {
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cpu = <0x01>;
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};
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};
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};
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cpu@0 {
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device_type = "cpu";
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reg = <0x00>;
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status = "okay";
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compatible = "riscv";
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riscv,isa = "rv64imafdvcsu";
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mmu-type = "riscv,sv39";
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clock-frequency = <0x17d7840>;
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interrupt-controller {
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#interrupt-cells = <0x01>;
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interrupt-controller;
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compatible = "riscv,cpu-intc";
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phandle = <0x16>;
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core0 {
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cpu = <0x01>;
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};
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};
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};
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soc {
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#address-cells = <0x02>;
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#size-cells = <0x02>;
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compatible = "simple-bus";
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ranges;
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cpu@0 {
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device_type = "cpu";
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reg = <0x00>;
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status = "okay";
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compatible = "riscv";
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riscv,isa = "rv64imafdvcsu";
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mmu-type = "riscv,sv39";
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clock-frequency = <0x17d7840>;
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interrupt-controller@70000000 {
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riscv,ndev = <0x65>;
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riscv,max-priority = <0x07>;
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reg-names = "control";
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reg = <0x00 0x70000000 0x00 0x4000000>;
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interrupts-extended = <0x16 0xffffffff 0x16 0x09>;
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interrupt-controller {
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#interrupt-cells = <0x01>;
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interrupt-controller;
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compatible = "riscv,plic0";
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#interrupt-cells = <0x02>;
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#address-cells = <0x00>;
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phandle = <0x04>;
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};
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clint@74000000 {
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interrupts-extended = <0x16 0x03 0x16 0x07>;
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reg = <0x00 0x74000000 0x00 0x10000>;
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compatible = "riscv,clint0";
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clint,has-no-64bit-mmio;
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compatible = "riscv,cpu-intc";
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phandle = <0x16>;
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};
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};
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};
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soc {
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#address-cells = <0x02>;
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#size-cells = <0x02>;
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compatible = "simple-bus";
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ranges;
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interrupt-controller@70000000 {
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riscv,ndev = <0x65>;
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riscv,max-priority = <0x07>;
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reg-names = "control";
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reg = <0x00 0x70000000 0x00 0x4000000>;
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interrupts-extended = <0x16 0xffffffff 0x16 0x09>;
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interrupt-controller;
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compatible = "riscv,plic0";
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#interrupt-cells = <0x02>;
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#address-cells = <0x00>;
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phandle = <0x04>;
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};
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clint@74000000 {
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interrupts-extended = <0x16 0x03 0x16 0x07>;
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reg = <0x00 0x74000000 0x00 0x10000>;
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compatible = "riscv,clint0";
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clint,has-no-64bit-mmio;
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};
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};
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```
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We see that PLIC is at 0x7000_0000, CLINT at 0x7400_0000. Let's implement this in NuttX...
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