Lup Yuen Lee 李立源 @lupyuen@qoto.org

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

Here's how we boot Apache #NuttX RTOS (or Linux) over the Network with U-Boot Bootloader and TFTP ... On @PINE64 #Star64 JH7110 #RISCV SBC

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

Maybe it's not that hard to roll out our own OS for #StarFive JH7110 #RISCV Boards 👍

Source: https://news.ycombinator.com/item?id=36901287

#NuttX Shell on #Star64 JH7110 #RISCV SBC won't show any Console Output ... Let's find out why

Source: https://github.com/lupyuen/nuttx-star64#no-uart-output-from-nuttx-shell

Join me at #ApacheCon Asia "Community Over Code" (Aug 18 - 20) ... We'll chat about Apache #NuttX RTOS on #PinePhone @PINE64

Details: https://apachecon.com/acasia2023/tracks/general.html

#NuttX Boot Code for #Star64 JH7110 SBC ... Modified for #RISCV Supervisor Mode

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#appendix-nuttx-in-supervisor-mode

Here's how #Linux gets the #RISCV Hart ID (CPU ID) from OpenSBI

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

After fixing, Apache #NuttX RTOS boots a bit more ... On #Star64 JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#fix-the-nuttx-boot-code

To run Apache #NuttX RTOS on #Star64 JH7110 SBC: We switch the code from #RISCV Machine Mode to Supervisor Mode

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#downgrade-nuttx-to-supervisor-mode