Lup Yuen Lee 李立源 @lupyuen@social.cleverlibre.org

Apache #NuttX RTOS supports 64-bit #RISCV StarFive #JH7110 SoC! 🎉 ... Now merging #Pine64 Star64 SBC into NuttX Mainline 👍

Source: https://github.com/apache/nuttx/pull/10069

Apache #NuttX RTOS now supports Synopsys DesignWare 8250 UART 👍

Source: https://github.com/apache/nuttx/pull/10019

We're porting Apache #NuttX RTOS to @PINE64 Star64 #JH7110 SBC ... Let's talk about the #RISCV Privilege Levels and UART Registers

Article: https://lupyuen.codeberg.page/articles/privilege

How we fixed the Spurious UART Interrupts on #RISCV Star64 #JH7110 and Apache #NuttX RTOS

Article: https://lupyuen.codeberg.page/articles/plic.html#appendix-fix-the-spurious-uart-interrupts

Here are the #UBoot Commands for Network Boot

Article: https://lupyuen.codeberg.page/articles/tftp.html#appendix-commands-for-u-boot-bootloader

Inside the U-Boot Startup Script for #RISCV Star64 #JH7110 SBC

Article: https://lupyuen.codeberg.page/articles/tftp.html#appendix-boot-script-for-u-boot-bootloader

Fixed the Spurious UART Interrupts for Apache #NuttX RTOS on Star64 #JH7110 🎉 ... Be careful with the UART Line Control Register! 👍

Source: https://www.mail-archive.com/dev@nuttx.apache.org/msg10275.html

Spurious UART Interrupts on Apache #NuttX RTOS for Star64 #JH7110 ... We might have a fix 👍

Source: https://news.ycombinator.com/item?id=36964561

We configure U-Boot Bootloader to Auto-Boot from Network ... Every time we power on #RISCV Star64 #JH7110 SBC

Article: https://lupyuen.codeberg.page/articles/tftp.html#configure-u-boot-for-tftp

Here are the U-Boot Commands for booting #NuttX (or Linux) over TFTP

Article: https://lupyuen.codeberg.page/articles/tftp.html#test-u-boot-with-tftp

UART Controller on Star64 #JH7110 won't trigger Interrupts ... Let's check the PLIC Interrupt Controller

Source: https://github.com/lupyuen/nuttx-star64#compare-uart-output-star64-vs-qemu

Testing U-Boot Bootloader with TFTP ... On #RISCV Star64 #JH7110 SBC

Article: https://lupyuen.codeberg.page/articles/tftp.html#test-u-boot-with-tftp

Copying the #NuttX Kernel (or Linux) to our TFTP Server for Network Booting

Article: https://lupyuen.codeberg.page/articles/tftp.html#copy-kernel-to-tftp-server

#NuttX Apps will trigger IRQ 8 when making a System Call for #RISCV Supervisor Mode

Source: https://github.com/lupyuen/nuttx-star64#uart-output-in-nuttx-qemu

Let's talk about #RISCV PLIC: Platform-Level Interrupt Controller ... For #Star64 JH7110 SBC

Source: https://github.com/lupyuen/nuttx-star64#platform-level-interrupt-controller-for-star64

Let's install a TFTP Server for Network Boot ... Thanks to #RustLang

Article: https://lupyuen.codeberg.page/articles/tftp.html#install-tftp-server

#NuttX Shell runs OK on #Star64 JH7110 #RISCV SBC! 🎉 ... But 16550 UART Controller fires too many Spurious Interrupts ... Each Dot = 1 Million Interrupts! 😲

Source: https://github.com/lupyuen/nuttx-star64#nuttx-star64-handles-uart-interrupts

How we'll boot Apache #NuttX RTOS (or Linux) over TFTP ... On #Star64 JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/tftp.html#boot-from-network

#StarFive JH7110 has 5 Harts (#RISCV Cores) ... Linux will boot on Hart 1 (not Hart 0)

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#appendix-hart-id-from-opensbi

How UART I/O works in Apache #NuttX RTOS

Source: https://github.com/lupyuen/nuttx-star64#uart-output-in-nuttx-qemu