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thefloweringash/rockchip-partition-layout.sfdisk Secret

Created September 3, 2020 23:12
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Rock64 partition layout
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rockchip-partition-layout.sfdisk
label: gpt
unit: sectors
first-lba: 64
/dev/mmcblk0p1 : start= 64, size= 16320, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, name="idbloader"
/dev/mmcblk0p2 : start= 16384, size= 8192, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, name="u-boot"
/dev/mmcblk0p3 : start= 24576, type=0FC63DAF-8483-4772-8E79-3D69D8477DE4, attrs="LegacyBIOSBootable"
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Untested method to mutate the nixos installer image into a bootable rock64 image:

  1. Find the start offset of the built image, currently this seems to be configured to 30M.
$ sfdisk -d $extract_image
label: dos
label-id: 0x2178694e
device: /tmp/img.dd
unit: sectors

/tmp/img.dd1 : start=       16384, size=       61440, type=b
/tmp/img.dd2 : start=       77824, size=     5424960, type=83, bootable

  1. Update the partition layout above to match the start of p3 to the installer image, replace 24576 with the discovered value, in this case 77824.

  2. Apply new partition layout

$ sfdisk /dev/mmcblk0 < rockchip-partition-layout.sfdisk
  1. Install u-boot
$ nix-build -A ubootRock64
$ dd if=result/idbloader.img of=/dev/mmcblk0p1
$ dd if=result/u-boot.itb    of=/dev/mmcblk0p2

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