#opensbi

[Перевод] Операционная система в 1 000 строках кода (часть 2)

Продолжаем серию статей, посвящённую написанию собственной минималистичной ОС. В прошлой части мы познакомились со всеми вводными компонентами проекта и поставили общие цели. В этой же мы реализуем загрузку ядра, вывод строки Hello World!, механизм паники ядра, а также некоторые функции управления памятью и работы со строками. ▍ Навигация по вышедшим частям Часть 1 Часть 2 < — вы здесь.

https://habr.com/ru/companies/ruvds/articles/875776/

#ruvds_перевод #операционные_системы #разработка_ядра #linux #паника_ядра #работа_с_памятью #opensbi

Inside TinyEMU #RISCV Emulator: This is how we emulate the #OpenSBI System Timer with the Machine-Mode System Timer

Article: https://lupyuen.codeberg.page/articles/tinyemu3.html#appendix-start-the-system-timer

Emulating the #OpenSBI System Timer ... For Apache #NuttX RTOS on #Ox64 BL808 Emulator

Article: https://lupyuen.codeberg.page/articles/tinyemu3.html#emulate-the-system-timer

Here's how we flash #UBoot Bootloader and #OpenSBI to #Ox64 BL808 #RISCV SBC

Article: https://lupyuen.codeberg.page/articles/ox64.html#flash-opensbi-and-u-boot

Let's boot Apache #NuttX RTOS on the #RISCV Star64 #JH7110 SBC (and VisionFive 2) ... And experiment with the #OpenSBI Supervisor Binary Interface

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

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

Setting the #RISCV System Timer by calling #OpenSBI

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

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

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

Checking up on #RISCV Cores with #OpenSBI

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

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

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

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

#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

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

Seems AMD with #openSIL could end up more open than RISC-V with their affinity to vintage hardware architecture #OpenSBI.

I found the fix to the #DRAM issue on the #JH7100 / #VisionFive1 - missed copying one stupid function call, whoopsies!

`disable_u74_memaxi_remap(1)` - that was it.

So, in other words: @oreboot now loads the #OpenSBI + U-Boot blob successfully and runs it from the cacheable RAM.

Next week I'll recap that and then get back to drafting #RustSBI, but the rest will be for next year.

I've mostly used the #pinephone with #mobian for communications.

The other day I got an email while sitting on the couch that a alternate #reproduciblebuilds patch for #opensbi was merged.

The smart thing to do would be to ssh into another machine to confirm the fix.

The *fun* thing to do was to confirm the fix by building the package twice on the pinephone using a standard #debian tool, sbuild.

It is so nice to have a handheld computer instead of a phone!

#notforeverybody #funforme