93e1459641
Signed-off-by: Wolfgang Denk <wd@denx.de> [trini: Drop changes for PEP 4 following python tools] Signed-off-by: Tom Rini <trini@ti.com>
49 lines
1.7 KiB
Plaintext
49 lines
1.7 KiB
Plaintext
High Assurance Boot (HAB) for i.MX6 CPUs
|
|
|
|
To authenticate U-Boot only by the CPU there is no code required in
|
|
U-Boot itself. However, the U-Boot image to be programmed into the
|
|
boot media needs to be properly constructed, i.e. it must contain a
|
|
proper Command Sequence File (CSF).
|
|
|
|
The Initial Vector Table contains a pointer to the CSF. Please see
|
|
doc/README.imximage for how to prepare u-boot.imx.
|
|
|
|
The CSF itself is being generated by Freescale HAB tools.
|
|
|
|
mkimage will output additional information about "HAB Blocks"
|
|
which can be used in the Freescale tooling to authenticate U-Boot
|
|
(entries in the CSF file).
|
|
|
|
Image Type: Freescale IMX Boot Image
|
|
Image Ver: 2 (i.MX53/6 compatible)
|
|
Data Size: 327680 Bytes = 320.00 kB = 0.31 MB
|
|
Load Address: 177ff420
|
|
Entry Point: 17800000
|
|
HAB Blocks: 177ff400 00000000 0004dc00
|
|
^^^^^^^^ ^^^^^^^^ ^^^^^^^^
|
|
| | |
|
|
| | -------- (1)
|
|
| |
|
|
| ------------------- (2)
|
|
|
|
|
--------------------------- (3)
|
|
|
|
(1) Size of area in file u-boot.imx to sign
|
|
This area should include the IVT, the Boot Data the DCD
|
|
and U-Boot itself.
|
|
(2) Start of area in u-boot.imx to sign
|
|
(3) Start of area in RAM to authenticate
|
|
|
|
CONFIG_SECURE_BOOT currently enables only an additional command
|
|
'hab_status' in U-Boot to retrieve the HAB status and events. This
|
|
can be useful while developing and testing HAB.
|
|
|
|
Commands to generate a signed U-Boot using Freescale HAB tools:
|
|
cst --o U-Boot_CSF.bin < U-Boot.CSF
|
|
objcopy -I binary -O binary --pad-to 0x2000 --gap-fill=0x00 \
|
|
U-Boot_CSF.bin U-Boot_CSF_pad.bin
|
|
cat u-boot.imx U-Boot_CSF_pad.bin > u-boot-signed.imx
|
|
|
|
NOTE: U-Boot_CSF.bin needs to be padded to the value specified in
|
|
the imximage.cfg file.
|