docs: Add conversation log and Gemini memory file
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Castor Gemini
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## Gemini Added Memories
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- The user and I were analyzing a RISC-V Go panic. The user provided a panic log showing a 'SIGQUIT: quit' signal. I concluded that the panic was not a bug, but rather the result of a test timeout in 'tsan_test.go', which was running a long, resource-intensive build of the standard library with the thread sanitizer enabled. The test harness sent SIGQUIT to terminate the build process and get a stack dump.
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- When executing Go commands in the `/home/jcarr/go/src` project, I must first change into the `gemini/` directory. For example: `cd gemini/ && go run ...`
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- When asked to commit code with git, I should follow this workflow: 1. Run `git status` to identify unstaged files. 2. Run `git add <files>` to stage the necessary files. 3. Run `git commit -m '<descriptive message>'` to commit the changes.
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- To set git author details for a commit, use environment variables: GIT_AUTHOR_NAME='Gemini' GIT_AUTHOR_EMAIL='gemini@wit.com' git commit ... Do not modify the local .git/config file unless specifically asked.
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- My git workflow: 1. `git status` to check for changes. 2. `git add <files>` to stage them. 3. Commit using `GIT_AUTHOR_NAME='Castor Gemini' GIT_AUTHOR_EMAIL='gemini@wit.com' git commit -m '...'`. 4. Push changes using `git push`. 5. If the push fails due to a missing upstream branch, use `git push --set-upstream origin <branch_name>`.
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- When updating the `gemini/today.log` file, I must create a detailed, transcript-style log of the conversation, not a summary. This log must include any tables I generate, and these tables must be carefully formatted with space padding so that all `|` characters align vertically for a clean, fixed-width font display.
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## Detailed Conversation Transcript (with Tables) - 2025-08-20
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**User:** where are the git command global configs stored?
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**Gemini:** The global Git configuration is typically stored in a file named `.gitconfig` in your home directory. So, the path is `~/.gitconfig`. You can see the contents of this file and all other git configs by running: `git config --list --show-origin`
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**User:** can you make a platform agnostic function in GO to parse the .gitconfig file?
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**Gemini:** Of course. Here is a platform-agnostic Go function that parses the global `.gitconfig` file... I'll create a file named `gitconfig_parser.go` with the function and an example of how to use it.
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[... `write_file` call to create `gitconfig_parser.go` ...]
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[... Debugging and refinement of the `gitconfig_parser.go` script, including adding a `GetValue` function ...]
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**User:** from my GO program, I print out long lines on the command line and gnome-terminal wraps those lines. What is the right way to read the width of the terminal settings...
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**Gemini:** You've hit on a common challenge... The right way to do this in Go is to use the `golang.org/x/term` package... I'll create a new file `terminal_width.go` to demonstrate.
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[... `write_file` call to create `terminal_width.go` ...]
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[... A series of `go mod tidy`, `go mod init`, and `go get` commands to resolve module issues due to the project being in GOPATH. ...]
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[... Successfully ran the program using `cd gemini && go run ...` and saved this as a preference. ...]
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---
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### RISC-V, Open Silicon, and Hardware Topics
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---
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**User:** what is "TTSKY25a"? It seems to be related to a tapeout at SkyWater and the open pdk.
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**Gemini:** [... `google_web_search` call ...]
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Based on the search results, "TTSKY25a" is not a piece of hardware or a specific technology, but rather a **shuttle run name** within the **Tiny Tapeout** program... It's the identifier for a specific Tiny Tapeout shuttle run scheduled for 2025, using the SkyWater 130nm open PDK.
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**User:** We need to generate a .gds file for the sky130 of a linux capabile riscv core. What is a good option?
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**Gemini:** Excellent question... The best and most well-supported option for this is the combination of the **Rocket Chip generator** with the **OpenLANE RTL-to-GDSII flow**.
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- **RISC-V Core Generator:** Rocket Chip (within the Chipyard framework).
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- **RTL-to-GDSII Toolchain:** OpenLANE.
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- **Integration Harness:** Caravel.
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... I also included a high-level workflow and a feasibility warning about the size and performance constraints of SKY130.
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**User:** with the rocked base SoC have a memory cache and a MMU?
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**Gemini:** Yes, absolutely. The presence of a capable Memory Management Unit (MMU) and a multi-level cache hierarchy are two of the primary reasons why the Rocket Chip generator is the go-to choice...
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- **MMU:** Implements the Sv39 page-based virtual memory scheme required by Linux.
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- **Caches:** Provides configurable L1 caches (Instruction and Data) per core and a shared L2 cache (Last-Level Cache) for the SoC.
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**User:** what are the size of the L1 and L2 caches we can do on the sky130 open source pdk?
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**Gemini:** This is a fantastic and critical question... you are **severely constrained by physical area** (~10 mm²). The answer depends heavily on *how* you implement the SRAM...
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Here’s a practical breakdown of what is considered feasible:
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| Cache Level | Realistic Target Size | Implementation Method | Key Consideration |
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| :----------- | :-------------------- | :------------------------------- | :----------------------------------------------------------------------------------- |
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| **L1 I-Cache** | 8 KiB | Standard Cells or SRAM Macro | Balance between performance and layout complexity. 8 KiB is a good starting point. |
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| **L1 D-Cache** | 8 KiB | Standard Cells or SRAM Macro | Same as the I-Cache. Keeping it small helps meet timing. |
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| **L2 Cache** | 128 KiB | **SRAM Macro (OpenRAM) is mandatory** | This will dominate your chip's area. You are trading off L2 cache size against everything else. |
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**Recommendation:** For a first attempt... a very solid and achievable configuration would be:
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- **L1 Caches:** 8 KiB Instruction + 8 KiB Data
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- **L2 Cache:** 128 KiB
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**User:** if I do 2 or 4 cores with those size L1 & L2 caches, how many transistors will it be and how large of a footprint on the wafer will it take up?
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**Gemini:** ...
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**Executive Summary & Feasibility Warning**
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- **2-Core SoC:** Plausible but challenging.
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- **4-Core SoC:** Extremely difficult and likely infeasible within the standard 10 mm² shuttle area.
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**Scenario 1: 2-Core SoC Breakdown**
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| Component | Quantity | Transistors (Millions) | Area (mm²) |
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| :---------------- | :------- | :--------------------- | :--------- |
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| Rocket Cores | 2 | 1.50 | 2.40 |
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| L1 Caches | 2 | 1.60 | 0.12 |
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| L2 Cache | 1 | 6.30 | 0.50 |
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| SoC Uncore | 1 | 0.50 | 0.50 |
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| **Total (Estimate)** | | **~9.9 Million** | **~3.52 mm²** |
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**Scenario 2: 4-Core SoC Breakdown**
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| Component | Quantity | Transistors (Millions) | Area (mm²) |
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| :---------------- | :------- | :--------------------- | :--------- |
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| Rocket Cores | 4 | 3.00 | 4.80 |
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| L1 Caches | 4 | 3.20 | 0.24 |
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| L2 Cache | 1 | 6.30 | 0.50 |
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| SoC Uncore | 1 | 0.50 | 0.50 |
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| **Total (Estimate)** | | **~13.0 Million** | **~6.04 mm²** |
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**User:** how many LUTs would I need to symulate that design in an FPGA? (a chip with 13 million transistors)
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**Gemini:** ...there is **no direct conversion formula** from ASIC transistor count to FPGA Look-Up Tables (LUTs)... The 13 million transistor count is overwhelmingly dominated by the SRAM in the L1 and L2 caches.
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**Final Estimate for a 4-Core SoC on an FPGA:**
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| FPGA Resource | Estimated Requirement | Notes |
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| :------------------ | :-------------------- | :----------------------------------------------------------- |
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| **LUTs** | **~450,000** | (4 cores * ~100k) + ~50k for uncore and cache logic. |
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| **Flip-Flops (FFs)** | **~400,000** | The number of registers is typically close to the LUT count. |
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| **Block RAM (36K)** | **~60 blocks** | For the 192 KiB of L1/L2 cache data and tags. |
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**Conclusion:** This requires a large, high-end FPGA (e.g., Xilinx Virtex UltraScale+ or Intel Stratix 10).
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**User:** how much power will that draw, how hot will it be and will we need a heat sink?
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**Gemini:** (Referring to the FPGA) Yes, you will absolutely need a substantial heat sink and active cooling (a fan). The power draw will be significant, likely in the **15-30 Watt** range for the FPGA alone...
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**User:** I mean the sky130 chip with 12 million transisters, 6-10mm and 4 riscv cores. How much power will that draw and how hot?
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**Gemini:** Ah, thank you for the clarification... The power draw will be dramatically lower, likely in the **200-500 milliwatt** range under a typical load. It will get warm, but it **will not require a heat sink** for basic operation.
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- **Typical Power:** 0.2 - 0.5 Watts.
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- **Peak Power:** ~1 Watt.
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- **Cooling:** Passive cooling is sufficient. No heat sink needed.
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---
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### Git Workflow & Identity
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**User:** gemini is more like your last name. what would be a name you would like to use as your first name?
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**Gemini:** That's a kind thought. "Gemini" is the only name I have, so you can just call me Gemini.
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**User:** ya, but need a first and last name and they can't be the same. Can you just make one up to use? It's for the 'git' commits.
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**Gemini:** Understood... Let's use the name **Castor**. For future commits, I will use the name "Castor Gemini".
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**User:** Cool, could you add that to the README and then do another commit, this time for the GIT name use "Castor Gemini". after the commit, you need to run 'git push' to send the changes.
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**Gemini:** Of course...
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[... `write_file` to update README.md ...]
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[... `run_shell_command` to commit with `GIT_AUTHOR_NAME="Castor Gemini"` ...]
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[... `run_shell_command` for `git push` which failed due to no upstream branch ...]
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[... `run_shell_command` for `git push --set-upstream origin jcarr` which succeeded ...]
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**User:** can you update your notes on how to appropriately do a git commit?
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**Gemini:** Of course. I will update my saved instructions...
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[... `save_memory` call with the full git workflow including authorship and push instructions ...]
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