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Update doc
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87
README.md
87
README.md
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@ -649,6 +649,8 @@ scp Image tftpserver:/tftpboot/Image-sg2000
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ssh tftpserver ls -l /tftpboot/Image-sg2000
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ssh tftpserver ls -l /tftpboot/Image-sg2000
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```
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```
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Build Outputs are here: https://github.com/lupyuen2/wip-nuttx/releases/tag/sg2000-1
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We have copied the NuttX Image to our TFTP Server. Let's boot this on Milk-V Duo S...
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We have copied the NuttX Image to our TFTP Server. Let's boot this on Milk-V Duo S...
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# Apache NuttX RTOS boots a tiny bit on Milk-V Duo S
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# Apache NuttX RTOS boots a tiny bit on Milk-V Duo S
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@ -945,9 +947,57 @@ booti ${kernel_addr_r} ${ramdisk_addr_r}:${ramdisk_size} ${fdt_addr_r}
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Which overwrites the NuttX Image in RAM. Watch what happens when we use the correct U-Boot Command...
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Which overwrites the NuttX Image in RAM. Watch what happens when we use the correct U-Boot Command...
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# NuttX Kernel Boots OK on SG2000
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# NuttX Kernel Boots OK on SG2000
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Here's the correct U-Boot Command...
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Earlier we made these fixes...
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1. We set the __NuttX Memory Map__ for SG2000: [nsh/defconfig](https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2#diff-fa4b30efe1c5e19ba2fdd2216528406d85fa89bf3d2d0e5161794191c1566078)
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```bash
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## Kernel RAM
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CONFIG_RAM_START=0x80200000
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CONFIG_RAM_SIZE=1048576
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```
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1. Also the __NuttX Linker Script__: [ld.script](https://github.com/lupyuen2/wip-nuttx/commit/c6c0bd3882a855420acf0d53fa9d37bbd9d125b2#diff-769e7c2389b298f666c84b92f36d3c42fa852fda61dbf20b93e603df98b7bd37)
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```c
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MEMORY {
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kflash (rx) : ORIGIN = 0x80200000, LENGTH = 2048K /* w/ cache */
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...
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SECTIONS {
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. = 0x80200000;
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```
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1. We select the __NuttX Driver for 16550 UART__: [nsh/defconfig](https://github.com/lupyuen2/wip-nuttx/commit/8f8831d15d6ddc913e6dd1c6c49fb0067640f6ec#diff-fa4b30efe1c5e19ba2fdd2216528406d85fa89bf3d2d0e5161794191c1566078)
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```bash
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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_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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1. Enable Logging for __NuttX Scheduler and Binary Loader__: [nsh/defconfig](https://github.com/lupyuen2/wip-nuttx/commit/4cee79630359f6b31fc9fa40f31bb476c8bc4d47#diff-fa4b30efe1c5e19ba2fdd2216528406d85fa89bf3d2d0e5161794191c1566078)
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```bash
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CONFIG_DEBUG_BINFMT=y
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CONFIG_DEBUG_BINFMT_ERROR=y
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CONFIG_DEBUG_BINFMT_WARN=y
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CONFIG_DEBUG_SCHED=y
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CONFIG_DEBUG_SCHED_ERROR=y
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CONFIG_DEBUG_SCHED_INFO=y
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CONFIG_DEBUG_SCHED_WARN=y
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```
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1. And disable the __PLIC Interrupt Controller__ (until we figure it out)
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Also we used the correct U-Boot Command...
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```bash
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```bash
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## This works OK for NuttX. RAM Disk Address must be `-`!
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## This works OK for NuttX. RAM Disk Address must be `-`!
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@ -1146,8 +1196,43 @@ serial@04140000 {
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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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Thus we compute [NuttX IRQ](https://lupyuen.github.io/articles/plic2#uart-interrupt) = 25 + RISC-V IRQ = 69
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# NuttX Shell runs OK on SG2000
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# NuttX Shell runs OK on SG2000
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Earlier we made these fixes...
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1. We dumped the __Linux Device Tree__ for SG2000...
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```bash
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## Convert the SG2000 Device Tree
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dtc \
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-o cv181x_milkv_duos_sd.dts \
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-O dts \
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-I dtb \
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cv181x_milkv_duos_sd.dtb
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```
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1. Snooped the __PLIC Interrupt Controller__ in the Device Tree: [cv181x_milkv_duos_sd.dts](https://github.com/lupyuen/nuttx-sg2000/blob/main/cv181x_milkv_duos_sd.dts)
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```c
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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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```
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1. And fixed the __NuttX Driver__ for PLIC Interrupts: [bl808_memorymap.h](https://github.com/lupyuen2/wip-nuttx/commit/f5f1aeac36350b8149fc2a77c817217711f082f6#diff-8fffa570a48f8f10004d9da8d4c671d34336f6c4b8dcfc2bd72275d8cda4ac04)
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```c
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// Base Address of PLIC Interrupt Controller
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#define BL808_PLIC_BASE 0x70000000ul
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```
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After fixing the Interrupt Controller and UART Interrupt: NuttX Kernel now boots all the way to NuttX Shell yay!
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After fixing the Interrupt Controller and UART Interrupt: NuttX Kernel now boots all the way to NuttX Shell yay!
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https://gist.github.com/lupyuen/b778986ba87c18067cd993b92c673634
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https://gist.github.com/lupyuen/b778986ba87c18067cd993b92c673634
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