Merge git://git.denx.de/u-boot-arc

[people/ms/u-boot.git] / doc / README.imx6

diff --git a/doc/README.imx6 b/doc/README.imx6
index e26ab711ed77826446da72b50442bb04e2b382e2..0e00968731f1d81a167c37aec35050b2430dc61e 100644 (file)
--- a/doc/README.imx6
+++ b/doc/README.imx6
@@ -7,7 +7,10 @@ SoC.
 -----------------------------------
 
 1.1 MAC Address: It is stored in fuse bank 4, with the 32 lsbs in word 2 and the
-    16 msbs in word 3.
+    16 msbs in word 3[15:0].
+    For i.MX6SX and i.MX6UL, they have two MAC addresses. The second MAC address
+    is stored in fuse bank 4, with the 16 lsb in word 3[31:16] and the 32 msbs in 
+    word 4.
 
 Example:
 
@@ -34,7 +37,7 @@ As the fuses are arranged in banks of 8 words:
 bank = 4
 word = 2
 
-And the U-boot command would be:
+And the U-Boot command would be:
 
 => fuse read 4 2
 Reading bank 4:
@@ -55,7 +58,7 @@ As the fuses are arranged in banks of 8 words:
 bank = 4
 word = 3
 
-And the U-boot command would be:
+And the U-Boot command would be:
 
 => fuse read 4 3
 Reading bank 4:
@@ -88,7 +91,7 @@ Word 0x00000002: 9f027772 00000004
 2. Using imx_usb_loader for first install with SPL
 --------------------------------------------------
 
-imx_usb_loader is a very nice tool by BoundaryDevice that
+imx_usb_loader is a very nice tool by Boundary Devices that
 allow to install U-Boot without a JTAG debugger, using
 the USB boot mode as described in the manual. It is
 a replacement for Freescale's MFGTOOLS.
@@ -135,3 +138,52 @@ c
 The last "c" command tells kermit (from ckermit package in most distros)
 to switch from command line mode to communication mode, and when the
 script is finished, the U-Boot prompt is shown in the same shell.
+
+3. Using Secure Boot on i.MX6 machines with SPL support
+-------------------------------------------------------
+
+This version of U-Boot is able to build a signable version of the SPL
+as well as a signable version of the U-Boot image. The signature can
+be verified through High Assurance Boot (HAB).
+
+CONFIG_SECURE_BOOT is needed to build those two binaries.
+After building, you need to create a command sequence file and use
+Freescales Code Signing Tool to sign both binaries. After creation,
+the mkimage tool outputs the required information about the HAB Blocks
+parameter for the CSF. During the build, the information is preserved
+in log files named as the binaries. (SPL.log and u-boot-ivt.log).
+
+More information about the CSF and HAB can be found in the AN4581.
+https://cache.freescale.com/files/32bit/doc/app_note/AN4581.pdf
+
+We don't want to explain how to create a PKI tree or SRK table as
+this is well explained in the Application Note.
+
+Example Output of the SPL (imximage) creation:
+ Image Type:   Freescale IMX Boot Image
+ Image Ver:    2 (i.MX53/6/7 compatible)
+ Mode:         DCD
+ Data Size:    61440 Bytes = 60.00 kB = 0.06 MB
+ Load Address: 00907420
+ Entry Point:  00908000
+ HAB Blocks:   00907400 00000000 0000cc00
+
+Example Output of the u-boot-ivt.img (firmware_ivt) creation:
+ Image Name:   U-Boot 2016.11-rc1-31589-g2a4411
+ Created:      Sat Nov  5 21:53:28 2016
+ Image Type:   ARM U-Boot Firmware with HABv4 IVT (uncompressed)
+ Data Size:    352192 Bytes = 343.94 kB = 0.34 MB
+ Load Address: 17800000
+ Entry Point:  00000000
+ HAB Blocks:   0x177fffc0   0x0000   0x00054020
+
+The CST (Code Signing Tool) can be downloaded from NXP.
+# Compile CSF and create signature
+./cst --o csf-u-boot.bin < command_sequence_uboot.csf
+./cst --o csf-SPL.bin < command_sequence_spl.csf
+# Append compiled CSF to Binary
+cat SPL csf-SPL.bin > SPL-signed
+cat u-boot-ivt.img csf-u-boot.bin > u-boot-signed.img
+
+These two signed binaries can be used on an i.MX6 in closed
+configuration when the according SRK Table Hash has been flashed.
\ No newline at end of file