twilco / twilco.github.io

My blog — https://twilco.github.io

twilco.github.io

Welcome! This repository houses the code for my blog.

Running locally:

1. Ensure you have Ruby 2.1.0 or higher installed - ruby --version
2. Install bundle and Jekyll - gem install bundle
3. Use bundler to install packages required for the project - bundle
4. Use Jekyll to serve the site at localhost:4000 - bundle exec jekyll serve

GitHub pages doesn't seem to be compatible with Ruby 3 yet, so using a Ruby version manager like rbenv to run Ruby 2.7.3 for this repository is recommended.

Feel free to open an issue or PR for anything you find that needs fixing, or if you enjoyed a specific post and want to see more like it.

https://twilco.github.io

twilco.github.io's Issues

RISC-V from scratch 4: Creating a function prologue for our UART driver (2 / 3)

RISC-V from scratch 4: Creating a function prologue for our UART driver (2 / 3)

A post continuing implementation of an NS16550A UART driver in RISC-V assembly. Function prologues are explained in depth and implemented for uart_get_char and uart_put_char, diagramming changes to the stack and registers instruction-by-instruction. Topics such as ABIs, calling conventions, stack frames, and more are also discussed.

https://twilco.github.io/riscv-from-scratch/2019/07/28/riscv-from-scratch-4.html

The `background` debacle — a case study on web compatibility

The background debacle — a case study on web compatibility

A case study on web compatibility featuring the serialization of the background CSS shorthand property. Learn about the CSS standards process and web platform tests (WPTs) along the way.

https://twilco.github.io/posts/2020/02/03/the-background-webcompat-debacle.html

Support direct links to section headers

Qemu and freedom-e-sdk has changed,please update.

Hi,
I am reading your articles from Hacker news, and doing following it.I find rivcv-qemu has merged into qemu mainstream, and freedom-e-sdk example build has a little change,please update follow the latest change.It help later readers.

Thanks.

undefined reference to `__global_pointers$'

Hi, I followed your article 2
first i didnt get what is the last file @ the end of below cmd
riscv64-unknown-elf-gcc -g -ffreestanding -O0 -Wl,--gc-sections
-nostartfiles -nostdlib -nodefaultlibs -Wl,-T,riscv64-virt.ld
crt0.s ns16550a.s
so i removed and inserted add.c
riscv64-unknown-elf-gcc -g -ffreestanding -O0 -Wl,--gc-sections -nostartfiles -nostdlib -nodefaultlibs -Wl,-T,riscv64-virt.ld crt0.s add.c

there, but i am getting following error
/tmp/cco7iPdF.o: In function .L0 ': /home/riscv/qemu/crt0.s:8: undefined reference to __global_pointers$'
/home/riscv/qemu/crt0.s:10: undefined reference to `__start_top'
collect2: error: ld returned 1 exit status

where am i doing wrong

Enable searching posts and post content globally across the site

https://jekyllrb.com/tutorials/convert-site-to-jekyll/#12-add-external-services

RISC-V from scratch 2: Hardware layouts, linker scripts, and C runtimes

RISC-V from scratch 2: Hardware layouts, linker scripts, and C runtimes

A post describing how C programs get to the main function. Devicetree layouts, linker scripts, minimal C runtimes, GDB and QEMU, basic RISC-V assembly, and other topics are reviewed along the way.

https://twilco.github.io/riscv-from-scratch/2019/04/27/riscv-from-scratch-2.html

Link to previous and next posts in a series at the top of the page

Rework "what's next" of part 1 of RISC-V from scratch

Once part two of RISC-V from scratch is complete, rewrite the "what's next" section of part one to be more precise.

Explore mdbooks for RISC-V from scratch series

This series may lend itself to the book-style format offered by mdbook.

https://github.com/rust-lang-nursery/mdBook

---

Potential deploy script to GitHub pages?

rust-lang/mdBook@3baa409

RISC-V from scratch 1: Introduction, toolchain setup, and hello world!

RISC-V from scratch 1: Introduction, toolchain setup, and hello world!

A post that discusses what RISC-V is and why it's important, teaches readers how to install the GNU RISC-V toolchain, and walks through building and running a simple C program on emulated RISC-V hardware.

https://twilco.github.io/riscv-from-scratch/2019/03/10/riscv-from-scratch-1.html