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nxp: document flash procedure and expose images in flake

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Jörg Thalheim
2025-11-04 13:31:19 +01:00
parent bffe23e699
commit 655a6da8a8
3 changed files with 76 additions and 3 deletions
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nxp/README.md
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@@ -38,3 +38,41 @@ Code snippet example that enables 'imx8mp-evk/imx8mq-evk/imx93-evk' configuratio
}
```
### 2.3 Building Boot Images
Boot images for flashing to SD cards can be built directly from the flake:
```bash
# Build boot image for i.MX8MP EVK
nix build github:NixOS/nixos-hardware#packages.aarch64-linux.imx8mp-boot
# Build boot image for i.MX8MQ EVK
nix build github:NixOS/nixos-hardware#packages.aarch64-linux.imx8mq-boot
# Build boot image for i.MX93 EVK
nix build github:NixOS/nixos-hardware#packages.aarch64-linux.imx93-boot
# Or from a local checkout
nix build .#packages.aarch64-linux.imx8mp-boot
```
The boot image will be available at `./result/image/flash.bin`.
**Note:** These packages target `aarch64-linux`. If you're on a different architecture (e.g., x86_64-linux), you'll need remote builders configured for aarch64-linux.
### 2.4 Flashing to SD Card
Once built, you can flash the boot image to an SD card:
```bash
# For i.MX8MP and i.MX93 (32KB offset):
sudo dd if=./result/image/flash.bin of=/dev/sdX bs=1k seek=32 conv=fsync
# For i.MX8MQ (33KB offset):
sudo dd if=./result/image/flash.bin of=/dev/sdX bs=1k seek=33 conv=fsync
```
**Note:** Different i.MX processors require different offsets. i.MX8MP and i.MX93 use 32KB (seek=32), while i.MX8MQ uses 33KB (seek=33).
**Warning:** Double-check the device path to avoid overwriting the wrong disk!