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Re:Ask HN: How do I start learning about lower level compile... by rramadass on Tuesday July 12, 2022 @11:26PM (#32078725)
For "Embedded C" you absolutely need this : https://www.safetty.net/publications/pttes

PS: You may find other helpful recommendations in my comment history.

Re:Ask HN: How do I start learning about lower level compile... by markus_zhang on Thursday July 14, 2022 @11:30AM (#32097307)
Thanks! That looks very interesting. I'll also browse your previous comments.