mirror of
https://github.com/samueldr/wip-pinebook-pro.git
synced 2024-11-06 02:59:41 +01:00
45 lines
1.5 KiB
Markdown
45 lines
1.5 KiB
Markdown
WIP stuff to get started on the pinebook pro.
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## `u-boot`
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Assuming `/dev/mmcblk0` is an SD card.
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```
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$ nix-build -A pkgs.uBootPinebookPro
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$ lsblk /dev/mmcblk0 && sudo dd if=result/idbloader.img of=/dev/mmcblk0 bs=512 seek=64 oflag=direct,sync && sudo dd if=result/u-boot.itb of=/dev/mmcblk0 bs=512 seek=16384 oflag=direct,sync
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```
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The eMMC has to be zeroed (in the relevant sectors) or else the RK3399 will use
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the eMMC as a boot device first.
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Alternatively, this u-boot can be installed to the eMMC.
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Installing to SPI has yet to be investigated.
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## Image build
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```
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$ ./build.sh
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$ lsblk /dev/mmcblk0 && sudo dd if=$(echo result/sd-image/*.img) of=/dev/mmcblk0 bs=8M oflag=direct status=progress
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```
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The `build.sh` script transmits parameters to `nix-build`, so e.g. `-j0` can
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be used.
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Once built, this image is self-sufficient, meaning that it should already be
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booting, no need burn u-boot to it.
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The required modules (and maybe a bit more) are present in stage-1 so the
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display should start early enough in the boot process.
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The LED should start up "amber, red, amber, green, amber" with this u-boot
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configuration, as a way to show activity early. The kernel should set it to
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green as soon as it can.
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## Note about cross-compilation
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This will automatically detect the need for cross-compiling or not.
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When cross-compiled, all caveats apply. Here this mainly means that the kernel
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will need to be re-compiled on the device on the first nixos-rebuild switch,
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while most other packages can be fetched from the cache.
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