Lup Yuen Lee 李立源 @lupyuen@qoto.org

Bare Metal Experiments on #Ox64 BL808 SBC ... With Apache #NuttX RTOS

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-bare-metal-experiments-8

#QuickJS JavaScript Engine blinks the LED ... On Apache #NuttX Emulator! 🎉

Source: https://github.com/lupyuen/quickjs-nuttx#quickjs-blinks-the-led-on-ox64-emulator

Adding ioctl() to #QuickJS JavaScript Engine ... So we can control #NuttX Devices

Source: https://github.com/lupyuen/quickjs-nuttx#add-ioctl-to-quickjs-for-nuttx

#QuickJS calls POSIX open() on Apache #NuttX RTOS 🎉 ... Up Next: Adding ioctl() to control NuttX Devices

Source: https://github.com/lupyuen/quickjs-nuttx#quickjs-calls-posix-open-on-nuttx

Let's write a #NuttX App for #Ox64 BL808 SBC

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-write-a-nuttx-app-7

#QuickJS JavaScript Engine runs OK on Apache #NuttX RTOS for QEMU #RISCV 🎉 ... Remember to increase the NuttX Stack Size 👍

Source: https://github.com/lupyuen/quickjs-nuttx#nuttx-stack-is-full-of-quickjs

Now we boot Apache #NuttX RTOS on #Ox64 BL808 SBC

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-boot-nuttx-on-ox64-6

#QuickJS on Apache #NuttX RTOS ... Hitting unexpected Sentinel Values 🤔

Source: https://github.com/lupyuen/quickjs-nuttx#atom-sentinel-becomes-0xffff_ffff

"Expect" Script for repeatedly testing QuickJS on Apache #NuttX (QEMU) ... Super efficient 👍

Source: https://github.com/lupyuen/quickjs-nuttx/blob/master/nuttx/qemu.exp

Mapping POSIX File Descriptors to ROM FS Files ... With a #ZigLang ArrayList

Source: https://github.com/lupyuen/tcc-riscv32-wasm/blob/romfs/zig/tcc-wasm.zig#L166-L328

Fixing QuickJS JavaScript Engine to build OK for Apache #NuttX RTOS

Source: https://github.com/lupyuen/quickjs-nuttx#fix-the-missing-functions

How we boot #Linux on #Ox64 BL808 SBC

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-boot-linux-on-ox64-5

Will QuickJS JavaScript Engine run on Apache #NuttX RTOS? 🤔

Source: https://github.com/lupyuen/quickjs-nuttx

Checking #Ox64 BL808 that we flashed OpenSBI and U-Boot Bootloader correctly 👍

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-verify-opensbi-and-u-boot-4

TCC Compiler in #WebAssembly gets a Major Makeover ... With ROM FS Filesystem and #ZigLang

Source: https://github.com/lupyuen/tcc-riscv32-wasm

#RISCV T-Head C9xx Cache Sync in #Linux Kernel ... Mystery solved 👍

Source: https://graphics.social/@daridrea/111892608849325322

Apache #NuttX Drivers bolding going to Strange New Worlds ... #ZigLang and #WebAssembly! 👍

Source: https://github.com/lupyuen/tcc-riscv32-wasm#puts-and-exit-work-ok-in-tcc-webassembly-and-nuttx-emulator-yay

Let's flash OpenSBI and U-Boot Bootloader to #Ox64 BL808 SBC

Article: https://www.hackster.io/lupyuen/8-risc-v-sbc-on-a-real-time-operating-system-ox64-nuttx-474358#toc-flash-opensbi-and-u-boot-3

Apache #NuttX Apps will terminate by calling the Exit System Call with #RISCV ECALL

Source: https://github.com/lupyuen/tcc-riscv32-wasm#implement-exit-with-nuttx-system-call

ROM FS Filesystem looks surprisingly readable 👍

Source: https://github.com/lupyuen/tcc-riscv32-wasm#inside-a-rom-fs-filesystem