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

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

🤔 Chocolate Banana Sourdough with Baked Beans

Here's how we modify Apache #NuttX RTOS to load the Initial RAM Disk (initrd) ... On #Star64 JH7110 #RISCV SBC

Source: https://github.com/lupyuen/nuttx-star64#modify-nuttx-star64-to-load-initial-ram-disk

#RISCV Code runs at 3 Privilege Levels: Machine, Supervisor or User

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#risc-v-privilege-levels

😂 Semihosting Horror Story

Source: https://lupyuen.codeberg.page/articles/semihost.html

Apache #NuttX RTOS fails to get the Hart ID (CPU ID) ... On #Star64 JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#nuttx-fails-to-get-hart-id

Now we modify Apache #NuttX RTOS to load the Initial RAM Disk (initrd) ... On #Star64 JH7110 #RISCV SBC

Source: https://github.com/lupyuen/nuttx-star64#modify-nuttx-star64-to-load-initial-ram-disk

Here's how we modify Apache #NuttX RTOS for #RISCV QEMU ... To load an Initial RAM Disk (initrd)

Source: https://github.com/lupyuen/nuttx-star64#modify-nuttx-qemu-to-load-initial-ram-disk

Apache #NuttX RTOS boots a tiny bit on #Star64 JH7110 #RISCV SBC 🎉 ... And crashes

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#boot-nuttx-on-star64

Watch what happens when we boot Apache #NuttX RTOS on #Star64 JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#boot-nuttx-on-star64

Let's modify Apache #NuttX RTOS for #RISCV QEMU ... To load an Initial RAM Disk (initrd)

Source: https://github.com/lupyuen/nuttx-star64#modify-nuttx-qemu-to-load-initial-ram-disk

Apache #NuttX RTOS on #RISCV QEMU ... Reads the Apps Filesystem over Semihosting

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

Magical Start Address of Apache #NuttX RTOS ... On #Star64 JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/nuttx2.html#start-address-of-nuttx-kernel