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

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

Let's probe for #RISCV SBI Extensions ... Before we call them

Article: https://lupyuen.codeberg.page/articles/sbi.html#probe-the-sbi-extensions

Here's how we read the SBI Spec Version from #RISCV #OpenSBI

Article: https://lupyuen.codeberg.page/articles/sbi.html#read-the-sbi-version

#RISCV Sv39 Memory Mgmt Unit ... Demystified for #Ox64 BL808 SBC 🤔

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

New in #RISCV SBI Spec 2.0: Debug Console I/O

Article: https://lupyuen.codeberg.page/articles/sbi.html#opensbi-debug-console

Copying the #NuttX BL602 UART Driver to #Ox64 BL808 ... And it works!

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

Let's run some #OpenSBI Experiments ... With Apache #NuttX RTOS on #Star64 JH7110 #RISCV SBC!

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

Here's how we call #OpenSBI from Apache #NuttX RTOS

Article: https://lupyuen.codeberg.page/articles/sbi.html#call-opensbi-from-nuttx

After patching the UART Driver ... Apache #NuttX RTOS prints a Crash Dump on #Ox64 BL808 SBC! 🎉

Source: https://github.com/lupyuen/nuttx-ox64#fix-the-nuttx-uart-driver-for-ox64-bl808

#OpenSBI provides Secure Access to the #RISCV System Functions ... Like for controlling CPUs and Timers

Article: https://lupyuen.codeberg.page/articles/sbi.html#opensbi-supervisor-binary-interface

How Apache #NuttX RTOS boots on #Ox64 BL808 #RISCV SBC

Source: https://github.com/lupyuen/nuttx-ox64#nuttx-boot-flow-for-ox64-bl808

MicroSD Timeout on #Ox64 BL808 SBC 🤔

Source: https://github.com/lupyuen/lupyuen.github.io/issues/20

Let's boot Apache #NuttX RTOS on #RISCV Star64 #JH7110 SBC (VisionFive5 too) ... And experiment with the #OpenSBI Supervisor Binary Interface

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