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

Factory Test Code for #RISCV PineTab-V #JH7110 has been mirrored here for quicker download

Source: https://github.com/lupyuen/nuttx-star64#pinetab-v-factory-test-code

#PinePhone @PINE64 with Apache #NuttX Real-Time Operating System ... Happens next weekend at Apache Conference Asia

Source: https://forum.pine64.org/showthread.php?tid=18600

Apache #NuttX RTOS halts with #RISCV MCAUSE 3 because of the EBREAK Instruction for Debugging ... But we're not doing any debugging!

Article: https://lupyuen.codeberg.page/articles/semihost.html#decipher-the-risc-v-exception

Apache #NuttX RTOS crashes on Star64 #JH7110 with #RISCV MCAUSE 3 ... Let's find out why

Article: https://lupyuen.codeberg.page/articles/semihost.html#nuttx-crashes-on-star64

#RISCV PineTab-V #JH7110 ships with Factory Test Code ... Let's look inside the code 👀

Source: https://wiki.pine64.org/wiki/PineTab-V_Releases

Apache #NuttX RTOS crashes on @PINE64 Star64 #JH7110 #RISCV SBC because there's no Semihosting ... Let's modify NuttX to boot with an Initial RAM Disk instead (initrd)

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

Check out the other #RISCV ports of Apache #NuttX RTOS

Article: https://lupyuen.codeberg.page/articles/privilege.html#other-risc-v-ports-of-nuttx

Fixing the #RISCV Machine Mode registers for Star64 #JH7110 SBC

Article: https://lupyuen.codeberg.page/articles/privilege.html#initialise-risc-v-supervisor-mode

#NuttX Kernel Mode executes NuttX Apps in unprivileged User Mode

Article: https://lupyuen.codeberg.page/articles/privilege.html#nuttx-flat-mode-becomes-kernel-mode

Switching #NuttX from #RISCV Machine Mode to Supervisor Mode

Article: https://lupyuen.codeberg.page/articles/privilege.html#risc-v-machine-mode-becomes-supervisor-mode

#RISCV Star64 #JH7110 SBC now officially supported by Apache #NuttX RTOS! 🎉

Source: https://github.com/apache/nuttx/pull/10094

Testing #RISCV Star64 #JH7110 SBC with Apache #NuttX RTOS ... Thanks to TFTP 👍

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

We change #RISCV "mstatus" to "sstatus" in Apache #NuttX RTOS ... Because it runs in Supervisor Mode on Star64 #JH7110

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

#RISCV "mstatus" Register won't work in #NuttX RTOS because we're running in Supervisor Mode ... Let's fix it for #JH7110

Article: https://lupyuen.codeberg.page/articles/privilege.html#critical-section-doesnt-return

Booting #RISCV Star64 #JH7110 SBC ... With Apache #NuttX RTOS 🎉

Source: https://github.com/lupyuen/nuttx-star64#nuttx-boots-ok-on-star64-jh7110

Apache #NuttX RTOS finally boots OK on #RISCV Star64 #JH7110 SBC 🎉 ... Right after we fixed the Spurious (and Furious) UART Interrupts 👍

Source: https://github.com/lupyuen/nuttx-star64#nuttx-boots-ok-on-star64-jh7110

Let's find out why #NuttX on Star64 #JH7110 gets stuck ... When we enter a Critical Section

Article: https://lupyuen.codeberg.page/articles/privilege.html#critical-section-doesnt-return

Creating a Bootable MicroSD for #NuttX on Star64 #JH7110 ... With a Flat Image Tree (FIT)

Source: https://github.com/lupyuen/nuttx-star64#bootable-microsd-for-nuttx

Here's the answer: UART Registers on Star64 #JH7110 are spaced differently from QEMU!

Article: https://lupyuen.codeberg.page/articles/privilege.html#uart-registers-are-spaced-differently

Guess why this UART code loops forever on Star64 #JH7110 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/privilege.html#wait-forever-in-uart-transmit