lowRISC / lowRISC/opentitan

[doc] Update directory structure overview

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Component:Doc Earlgrey-PROD Triaged
Dominant language
SystemVerilog
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Description

As I was going through the documentation while onboarding, I've found that the directory structure described under `doc/ug/directory_structure.md` is a bit outdated and doesn't match the current codebase. In particular:
- Directories `top_englishbreakfast`, `syn`, `data`, and `ip_templates` are missing from "Directory structure under `hw`"
- Directories `silicon_creator`, `otp_img`, `riscv_compliance_support`, and `sca` are missing from "Directory structure under `sw`"
- Directory `sw/device/doc` is listed but does not exist (is this now the top-level `doc`?)
- `sw/silicon_creator/boot_rom` is described as "Sources for generating the primary boot image loaded into ROM", which if I understand correctly is no longer the case

I'm happy to update these according to my understanding, but I'd appreciate getting help/feedback from someone who knows the codebase better!

Contributor guide

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First steps

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  3. Fork the repository and make your change on a branch.
  4. Open a pull request that references the issue number.

Research direction

Start with doc/ug/directory_structure.md and compare its hw and sw listings with the current repository directories. Check whether sw/device/doc still exists and verify the description of sw/silicon_creator/boot_rom against the current codebase. Done means the overview lists current directories and accurately describes boot_rom.

Written by the indexing model from the issue text.

Assessment

Tech stack
markdown
Domain
documentation
Issue type
Documentation
Difficulty
3/5
Estimated time
1-2 days
Activity status
Stale
Clarity
Mostly clear
Newbie friendliness
45/100

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