projects / J-u-boot.git / blame
| Commit | Line | Data |
|---|---|---|
| 0187c985 SB |
1 | High Assurance Boot (HAB) for i.MX6 CPUs |
| 2 | ||
| 3 | To authenticate U-Boot only by the CPU there is no code required in | |
| 4 | U-Boot itself. However, the U-Boot image to be programmed into the | |
| 5 | boot media needs to be properly constructed, i.e. it must contain a | |
| 6 | proper Command Sequence File (CSF). | |
| 7 | ||
| 8 | The Initial Vector Table contains a pointer to the CSF. Please see | |
| 9 | doc/README.imximage for how to prepare u-boot.imx. | |
| 10 | ||
| 11 | The CSF itself is being generated by Freescale HAB tools. | |
| 12 | ||
| 13 | mkimage will output additional information about "HAB Blocks" | |
| 14 | which can be used in the Freescale tooling to authenticate U-Boot | |
| 15 | (entries in the CSF file). | |
| 16 | ||
| 17 | Image Type: Freescale IMX Boot Image | |
| 18 | Image Ver: 2 (i.MX53/6 compatible) | |
| 19 | Data Size: 327680 Bytes = 320.00 kB = 0.31 MB | |
| 20 | Load Address: 177ff420 | |
| 21 | Entry Point: 17800000 | |
| 22 | HAB Blocks: 177ff400 00000000 0004dc00 | |
| 93e14596 | 23 | ^^^^^^^^ ^^^^^^^^ ^^^^^^^^ |
| 0187c985 SB |
24 | | | | |
| 25 | | | -------- (1) | |
| 26 | | | | |
| 27 | | ------------------- (2) | |
| 28 | | | |
| 29 | --------------------------- (3) | |
| 30 | ||
| 31 | (1) Size of area in file u-boot.imx to sign | |
| 32 | This area should include the IVT, the Boot Data the DCD | |
| 33 | and U-Boot itself. | |
| 34 | (2) Start of area in u-boot.imx to sign | |
| 35 | (3) Start of area in RAM to authenticate | |
| 36 | ||
| 37 | CONFIG_SECURE_BOOT currently enables only an additional command | |
| 38 | 'hab_status' in U-Boot to retrieve the HAB status and events. This | |
| 39 | can be useful while developing and testing HAB. | |
| 40 | ||
| 41 | Commands to generate a signed U-Boot using Freescale HAB tools: | |
| 42 | cst --o U-Boot_CSF.bin < U-Boot.CSF | |
| 43 | objcopy -I binary -O binary --pad-to 0x2000 --gap-fill=0x00 \ | |
| 44 | U-Boot_CSF.bin U-Boot_CSF_pad.bin | |
| 45 | cat u-boot.imx U-Boot_CSF_pad.bin > u-boot-signed.imx | |
| 46 | ||
| 47 | NOTE: U-Boot_CSF.bin needs to be padded to the value specified in | |
| 48 | the imximage.cfg file. |