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Librem 5

Boards

  • librem5-phone
  • librem5-devkit

Flashing

For flashing the image, you'll also need uuu. You can get uuu from https://source.puri.sm/Librem5/mfgtools Just make sure uuu is in your path when flashing the image. I've just copied the built binaries to /usr/local: cp uuu/uuu /usr/local/bin/; cp libuuu/libuuu* /usr/local/lib/;

The uuu scripts this image builder uses are in script/uuu/.

useful make targets

Name Purpose
uuu-flash flash the image to emmc0 using uuu. You can specify a different image using IMAGE_NAME. If this image doesn't have an uboot usable for flashing, use IMAGE_UBOOT_UNFLASHABLE=1 to use the uboot from uboot/bin/uboot_firmware_and_dtb.bin instead for that step.
uuu-uboot-flash flash uboot (doesn't include m4)
uuu-test-uboot Just boot using uboot bootloader from uboot/bin/uboot_firmware_and_dtb.bin (doesn't quiet work as intended yet)
uuu-test-uboot//image Just boot using uboot bootloader from bin/$(IMAGE_NAME). (doesn't quiet work as intended yet)
uuu-test-kernel Just boot using kernel from .(kernel/bin/linux-image-*.deb. (doesn't quiet work as intended yet)

Other important stuff

There are currently 5 Proprietary binary blobs from nxp contained in the final uboot binary with non-free licenses:

  • lpddr4_pmu_train_1d_dmem.bin
  • lpddr4_pmu_train_1d_imem.bin
  • lpddr4_pmu_train_2d_dmem.bin
  • lpddr4_pmu_train_2d_imem.bin
  • signed_hdmi_imx8m.bin
  • signed_dp_imx8m.bin

One of the lpddr4_*.bin files is required for training the DDR PHY. The HDMI/DP bin file is for DRM HDMI/DP signals. All of the lpddr4_*.bin firmware files are currently needed to build uboot and thus the image.