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We ran a Unix-like OS on our home-built CPU with a home-built C compiler (2020)

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305 points AlexeyBrin | 2 comments | 28 Jun 25 12:20 UTC | HN request time: 0.439s | source
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Tepix ◴[28 Jun 25 14:11 UTC] No.44404824[source]▶
Very impressive! Low end work is often tedious and time consuming, especially if you lack the essentials like a debugger.
replies(1): >>44405375 #
73kl4453dz ◴[28 Jun 25 15:27 UTC] No.44405375[source]▶
Until you've used an oscilloscopes to debug your buggy kprintf, you haven't lived.
replies(2): >>44405782 #>>44408370 #
1. tonyarkles ◴[28 Jun 25 16:13 UTC] No.44405782[source]▶
LOL in my 4th year Advanced Operating Systems Concepts course we wrote a toy x86 OS from scratch. We obviously didn't have to make our own hardware, but uhhhh I definitely added a bunch of printfs inside QEMU to dump out CPU states when we couldn't figure out the chain of events that led to hard faults.

On the other side... have also definitely used a pair of LEDs to try to debug an RTOS on a microcontroller with no JTAG access...

replies(1): >>44410751 #
2. ForOldHack ◴[29 Jun 25 06:27 UTC] No.44410751[source]▶
"couldn't figure out the chain of events that led to hard faults..."

Tales from the terminal/dark side/h4x0r pro in da house!