u-boot/doc/README.update

5 --------
10 boot. The update file should be a FIT file, and can contain one or more
12 should be placed, updates are also protected with a SHA-1 checksum. If the
16 The auto-update feature is enabled by the CONFIG_UPDATE_TFTP macro:
21 Note that when enabling auto-update, Flash support must be turned on.  Also,
27 The auto-update feature uses the following configuration knobs:
29 - CONFIG_UPDATE_LOAD_ADDR
36 - CONFIG_UPDATE_TFTP_CNT_MAX
40   server. Since a transfer is attempted during each boot, it is undesirable to
45   be non-negative and is 0 by default, CONFIG_UPDATE_TFTP_MSEC_MAX must be
55 If an optional, non-zero address is provided as argument, the TFTP transfer
61 ------------------
63 - doc/uImage.FIT/update_uboot.its
66   replacing U-Boot image on a system.
68   Assuming that an U-Boot image u-boot.bin is present in the current working
70   'update_uboot.its' file is where the U-Boot is stored in Flash, the
73   mkimage -f update_uboot.its update_uboot.itb
77   appropriately, for example in the U-Boot prompt:
83   'serverip' environment variable is accessible, the new U-Boot image will be
86   NOTE: do make sure that the 'u-boot.bin' image used to create the update
89   attempting the auto-update can render the system unusable.
91 - doc/uImage.FIT/update3.its
98 -------------------
100 - It is now possible to update firmware (bootloader, kernel, rootfs, etc.) via