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authorTom Rini <>2015-03-05 07:22:18 -0500
committerTom Rini <>2015-03-05 07:22:18 -0500
commit02ebe6f702ec8d025926b0ea7c2088e302c5a302 (patch)
tree15e249ac39e9c547668327218e63a0faf54a3283 /doc
parent7ae8350f67eea861280a4cbd2d067777a0e87153 (diff)
parent32df39c741788e8637cffe6633d73594b26d70fb (diff)
Merge branch 'master' of git://
Diffstat (limited to 'doc')
2 files changed, 49 insertions, 0 deletions
diff --git a/doc/README.fsl-esdhc b/doc/README.fsl-esdhc
index b70f271d1a..619c6b2d07 100644
--- a/doc/README.fsl-esdhc
+++ b/doc/README.fsl-esdhc
@@ -1,5 +1,6 @@
CONFIG_SYS_FSL_ESDHC_LE means ESDHC IP is in little-endian mode.
CONFIG_SYS_FSL_ESDHC_BE means ESDHC IP is in big-endian mode.
Accessing ESDHC registers can be determined by ESDHC IP's endian
mode or processor's endian mode.
diff --git a/doc/README.mxc_hab b/doc/README.mxc_hab
index 43e64a2797..e9340dd14c 100644
--- a/doc/README.mxc_hab
+++ b/doc/README.mxc_hab
@@ -46,3 +46,51 @@ 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.
+Setup U-Boot Image for Encrypted Boot
+An authenticated U-Boot image is used as starting point for
+Encrypted Boot. The image is encrypted by Freescale's Code
+Signing Tool (CST). The CST replaces only the image data of
+u-boot.imx with the encrypted data. The Initial Vector Table,
+DCD, and Boot data, remains in plaintext.
+The image data is encrypted with a Encryption Key (DEK).
+Therefore, this key is needed to decrypt the data during the
+booting process. The DEK is protected by wrapping it in a Blob,
+which needs to be appended to the U-Boot image and specified in
+the CSF file.
+The DEK blob is generated by an authenticated U-Boot image with
+the dek_blob cmd enabled. The image used for DEK blob generation
+needs to have the following configurations enabled:
+Note: The encrypted boot feature is only supported by HABv4 or
+The dek_blob command then can be used to generate the DEK blob of
+a DEK previously loaded in memory. The command is used as follows:
+dek_blob <DEK address> <Output Address> <Key Size in Bits>
+example: dek_blob 0x10800000 0x10801000 192
+The resulting DEK blob then is used to construct the encrypted
+U-Boot image. Note that the blob needs to be transferred back
+to the host.Then the following commands are used to construct
+the final image.
+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
+objcopy -I binary -O binary --pad-to <blob_dst> --gap-fill=0x00 \
+ u-boot-signed.imx u-boot-signed-pad.bin
+cat u-boot-signed-pad.imx DEK_blob.bin > u-boot-encrypted.imx
+ NOTE: u-boot-signed.bin needs to be padded to the value
+ equivalent to the address in which the DEK blob is specified
+ in the CSF.
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