README.mxc_hab 1.7 KB

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  1. High Assurance Boot (HAB) for i.MX6 CPUs
  2. To authenticate U-Boot only by the CPU there is no code required in
  3. U-Boot itself. However, the U-Boot image to be programmed into the
  4. boot media needs to be properly constructed, i.e. it must contain a
  5. proper Command Sequence File (CSF).
  6. The Initial Vector Table contains a pointer to the CSF. Please see
  7. doc/README.imximage for how to prepare u-boot.imx.
  8. The CSF itself is being generated by Freescale HAB tools.
  9. mkimage will output additional information about "HAB Blocks"
  10. which can be used in the Freescale tooling to authenticate U-Boot
  11. (entries in the CSF file).
  12. Image Type: Freescale IMX Boot Image
  13. Image Ver: 2 (i.MX53/6 compatible)
  14. Data Size: 327680 Bytes = 320.00 kB = 0.31 MB
  15. Load Address: 177ff420
  16. Entry Point: 17800000
  17. HAB Blocks: 177ff400 00000000 0004dc00
  18. ^^^^^^^^ ^^^^^^^^ ^^^^^^^^
  19. | | |
  20. | | -------- (1)
  21. | |
  22. | ------------------- (2)
  23. |
  24. --------------------------- (3)
  25. (1) Size of area in file u-boot.imx to sign
  26. This area should include the IVT, the Boot Data the DCD
  27. and U-Boot itself.
  28. (2) Start of area in u-boot.imx to sign
  29. (3) Start of area in RAM to authenticate
  30. CONFIG_SECURE_BOOT currently enables only an additional command
  31. 'hab_status' in U-Boot to retrieve the HAB status and events. This
  32. can be useful while developing and testing HAB.
  33. Commands to generate a signed U-Boot using Freescale HAB tools:
  34. cst --o U-Boot_CSF.bin < U-Boot.CSF
  35. objcopy -I binary -O binary --pad-to 0x2000 --gap-fill=0x00 \
  36. U-Boot_CSF.bin U-Boot_CSF_pad.bin
  37. cat u-boot.imx U-Boot_CSF_pad.bin > u-boot-signed.imx
  38. NOTE: U-Boot_CSF.bin needs to be padded to the value specified in
  39. the imximage.cfg file.