Lup Yuen Lee 李立源 @lupyuen@qoto.org

Something special about #RISCV T-Head C906 PLIC (Platform-Level Interrupt Controller) ... And it's bugging Apache #NuttX RTOS on #Ox64 BL808 SBC 😬

Source: https://github.com/lupyuen/nuttx-ox64#uart-interrupt-for-ox64-bl808

Here's how Apache #NuttX RTOS starts an ELF App

Source: https://github.com/lupyuen/nuttx-ox64#kernel-starts-a-nuttx-app

#Ox64 BL808 uses 2 UART Ports ... One for Flashing, another for Linux Console!

Article: https://lupyuen.codeberg.page/articles/ox64.html#flashing-uart-vs-serial-console

Fixing the Initial RAM Disk for Apache #NuttX RTOS on #Ox64 BL808 #RISCV SBC

Source: https://github.com/lupyuen/nuttx-ox64#initial-ram-disk-for-ox64-bl808

🤔 "One can hide on a certain day ... But cannot hide for a long time" (躲过初一，躲不过十五)

Is #Ox64 BL808 an SBC or MCU Board? Actually it works like both!

Article: https://lupyuen.codeberg.page/articles/ox64

How our #NuttX App makes a #RISCV System Call "ecall" to NuttX Kernel

Source: https://github.com/lupyuen/nuttx-ox64#nuttx-app-calls-nuttx-kernel

Let's boot #Linux on #Ox64 BL808 #RISCV SBC @PINE64 ... And ponder how Apache #NuttX RTOS might run on Ox64

Article: https://lupyuen.codeberg.page/articles/ox64

#NuttX Job Opportunity at Xiaomi

Source: https://www.mail-archive.com/dev@nuttx.apache.org/msg10811.html

#NuttX App makes a #RISCV System Call "ecall" to NuttX Kernel

Source: https://github.com/lupyuen/nuttx-ox64#nuttx-app-calls-nuttx-kernel

Apache #NuttX RTOS for #Star64 JH7110 will call these #OpenSBI Functions

Article: https://lupyuen.codeberg.page/articles/sbi.html#integrate-opensbi-with-nuttx

Calling #OpenSBI to read the #RISCV System Info ... On #Star64 JH7110 SBC

Article: https://lupyuen.codeberg.page/articles/sbi.html#fetch-the-system-info

Apache #NuttX RTOS switches Level 1 Page Tables ... By swapping the #RISCV SATP Register! Nifty trick 👍

Article: https://lupyuen.codeberg.page/articles/mmu.html#swap-the-satp-register

Setting the #RISCV System Timer by calling #OpenSBI

Article: https://lupyuen.codeberg.page/articles/sbi.html#set-a-system-timer

Fixing the Initial RAM Disk for Apache #NuttX RTOS on #Ox64 BL808 #RISCV SBC

Source: https://github.com/lupyuen/nuttx-ox64#initial-ram-disk-for-ox64-bl808

Here's how we run Apache #NuttX RTOS in #RISCV Kernel Mode with #QEMU

Source: https://github.com/lupyuen/lupyuen.github.io/issues/21#issuecomment-1814305271

To Shutdown and Reboot our #RISCV SBC ... Just call #OpenSBI!

Article: https://lupyuen.codeberg.page/articles/sbi.html#shutdown-and-reboot-the-sbc

Table full of ... #RISCV Page Tables 😂

Source: https://github.com/lupyuen/nuttx-ox64#nuttx-memory-map-for-ox64-bl808

Checking up on #RISCV Cores with #OpenSBI

Article: https://lupyuen.codeberg.page/articles/sbi.html#query-the-risc-v-cpus

#Ox64 BL808 #RISCV SBC ... Boots Apache #NuttX RTOS yay! 🎉 ... Now fixing Console Input and Interrupts 🤔

Source: https://github.com/lupyuen/nuttx-ox64#fix-the-nuttx-memory-map-for-plic