Lup Yuen Lee 李立源 @lupyuen@qoto.org

Fixed the MMU Cache for #Ox64 BL808 #RISCV SBC on Apache #NuttX RTOS 👍

Source: https://github.com/apache/nuttx/pull/11585

Remember to Flush the MMU Cache when switching Page Tables ... On #RISCV T-Head C906 and #Ox64 BL808 SBC

Article: https://lupyuen.codeberg.page/articles/mmu.html#appendix-flush-the-mmu-cache-for-t-head-c906

We copied the #NuttX UART Driver from PineCone BL602 to #Ox64 BL808 ... And it works! 👍

Article: https://lupyuen.codeberg.page/articles/plic2.html#appendix-uart-driver-for-ox64

Flushing the MMU Cache for #RISCV T-Head C906 .... Tested OK with #Ox64 BL808 and Apache #NuttX RTOS 👍

Source: https://gist.github.com/lupyuen/def8fb96245643c046e5f3ad6c4e3ed0#found-solution-flush-the-cache-with-dcachecall-dcacheiall-icacheiall

Remember to enable MMU Strong Ordering on #Ox64 BL808 and #RISCV T-Head C906 ... Or strange things will happen 😬

Article: https://lupyuen.codeberg.page/articles/plic2.html#trouble-with-interrupt-priority

Emulator for #Ox64 BL808 #RISCV SBC @PINE64 ... Boots OK with Apache #NuttX RTOS! 🎉

Article: https://lupyuen.codeberg.page/articles/tinyemu2.html

Dispatching and Completing the UART Interrupts ... On #Ox64 BL808 #RISCV SBC with Apache #NuttX RTOS

Article: https://lupyuen.codeberg.page/articles/plic2.html#dispatch-the-interrupt

Apache #NuttX RTOS in Kernel Mode ... Works great with TinyEMU #RISCV Emulator! 🎉

Source: https://github.com/lupyuen/ox64-tinyemu/tree/smode#start-nuttx-kernel-in-supervisor-mode

How we handle a #RISCV Interrupt with Platform-Level Interrupt Controller (PLIC)

Article: https://lupyuen.codeberg.page/articles/plic2.html#handle-the-interrupt

How #Ox64 BL808 #RISCV SBC boots Apache #NuttX RTOS ... Exactly like Linux

Source: https://lupyuen.codeberg.page/articles/app

Why is #Ox64 BL808 reusing the old MMU Page Tables of the Previous Process? Need to investigate #RISCV T-Head C906 MMU Caching 🤔

Source: https://gist.github.com/lupyuen/def8fb96245643c046e5f3ad6c4e3ed0#found-workaround-bypass-the-destroying-of-address-environment

How we Emulate the #Ox64 BL808 UART Port ... In TinyEMU #RISCV Emulator

Source: https://github.com/lupyuen/nuttx-tinyemu#intercept-uart-registers-for-ox64-bl808-emulator

We configure #RISCV Interrupts for #Ox64 BL808 SBC at Hart 0, Supervisor Mode

Article: https://lupyuen.codeberg.page/articles/plic2.html#hart-0-supervisor-mode

Emulate #Ox64 BL808 #RISCV SBC in the Web Browser ... Making good progress! 👍

Source: https://github.com/lupyuen/nuttx-tinyemu#emulate-ox64-bl808-in-web-browser

Enabling #RISCV Interrupts in the Platform-Level Interrupt Controller (PLIC)

Article: https://lupyuen.codeberg.page/articles/plic2.html#enable-the-interrupt

Walking through the #RISCV Level 1, 2 and 3 MMU Page Tables ... On #Ox64 BL808 with Apache #NuttX RTOS 🤔

Source: https://gist.github.com/lupyuen/def8fb96245643c046e5f3ad6c4e3ed0#dump-the-level-1-page-tables

hardware_hustle: Tabletop Game about running a small Hardware Business

Source: https://github.com/oskitone/hardware_hustle

We emulate the #Ox64 BL808 UART Registers in TinyEMU #RISCV Emulator ... Now we see Virtual Ox64 booting Apache #NuttX RTOS! 🎉

Source: https://github.com/lupyuen/nuttx-tinyemu#intercept-uart-registers-for-ox64-bl808-emulator

How we set the #RISCV Interrupt Priority and Threshold for Platform-Level Interrupt Controller (PLIC)

Article: https://lupyuen.codeberg.page/articles/plic2.html#set-the-interrupt-priority

Bread Machine #Sourdough ... Stretch & Fold really helps! 👍

Recipe: https://lupyuen.codeberg.page/articles/sourdough.html