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Claudio
2024-12-02 15:11:30 +01:00
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A loom video instruction can be found [here](https://www.loom.com/share/f6460a1200fe499eb3aae941c8bd8ca8?sid=49451325-5d3a-4953-8e24-7007af44a99e).
# Preparation
1. Decide which image you want to flash to the cm4. All images can be found on the [google drive](https://drive.google.com/drive/folders/1SCE0VCfHIKdJlZBVMUI5AOd8uqdrAA_7) and usually you can find an overview on the [CM4 Images Overview sheet](https://docs.google.com/spreadsheets/d/1hWfCUwhnYKjQz526QUwpVui-eFWYgPfyoRJ40pwvJD8/edit#gid=0). For this example I chose the image `cm16_240104.img.xz`.
2. Decide which physical cm4 board you want to flash the image to. A list of all cm4's that we own can be found in the [CM4 overview sheet](https://docs.google.com/spreadsheets/d/18PtsqKYUrfK0cAAFBfwtgTSo0JnJ0n5Dc3oIjpWry6I/edit#gid=0). For this example we chose the cm4 with ID 14.
1. Be aware that there are two versions of cm4s. The lite version requires a SD-card whereas the EMMC version does not. The flashing instructions are different for the two.
2. The cm4s also come with different RAM and EMMC storage. You can visually inspect the part numbers if you are unsure. E.g. [RAM](https://semiconductor.samsung.com/dram/lpddr/lpddr4/k4f6e304hb-mgcj/), or [EMMC](https://semiconductor.samsung.com/estorage/emmc/emmc-5-1/klmbg2jetd-b041/).
# Flashing
If you have the EMMC version follow the instructions here: https://onesecinc.atlassian.net/wiki/spaces/MC1/pages/35029029/Flash+CM4+EMMC+with+a+new+Image
If you flash a Lite version, plug the SD-card into your development computer and then follow the instructions starting from point 5.
# UID
# Testing

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# Troubleshooting
## Really slow internet
I realized that the [[git]] commands `git fetch` or `git push` were extremely slow (several minutes). And it was because of a slow internet connection. The ping of google.com was like 64000 ms or so. The problem in the end was that the cm4 was using the `wwan0` interface (which is our LTE connection) but the antenna was not connected. I was surprised that it even found a network at all.
The solution was to either connect the antenna, or to take the network down with
`sudo ip link set wwan0 down`.