|
|
|
|
---------------------------------------------
|
|
|
|
|
Imximage Boot Image generation using mkimage
|
|
|
|
|
---------------------------------------------
|
|
|
|
|
|
|
|
|
|
This document describes how to set up a U-Boot image
|
|
|
|
|
that can be booted by Freescale MX25, MX35 and MX51
|
|
|
|
|
processors via internal boot mode.
|
|
|
|
|
|
|
|
|
|
These processors can boot directly from NAND, SPI flash and SD card flash
|
|
|
|
|
using its internal boot ROM support. They can boot from an internal
|
|
|
|
|
UART, if booting from device media fails.
|
|
|
|
|
Booting from NOR flash does not require to use this image type.
|
|
|
|
|
|
|
|
|
|
For more details refer Chapter 2 - System Boot and section 2.14
|
|
|
|
|
(flash header description) of the processor's manual.
|
|
|
|
|
|
|
|
|
|
This implementation does not use at the moment the secure boot feature
|
|
|
|
|
of the processor. The image is generated disabling all security fields.
|
|
|
|
|
|
|
|
|
|
Command syntax:
|
|
|
|
|
--------------
|
|
|
|
|
./tools/mkimage -l <mx u-boot_file>
|
|
|
|
|
to list the imx image file details
|
|
|
|
|
|
|
|
|
|
./tools/mkimage -T imximage \
|
|
|
|
|
-n <board specific configuration file> \
|
|
|
|
|
-e <execution address> -d <u-boot binary> <output image file>
|
|
|
|
|
|
|
|
|
|
For example, for the mx51evk board:
|
|
|
|
|
./tools/mkimage -n ./board/freescale/mx51evk/imximage.cfg \
|
|
|
|
|
-T imximage -e 0x97800000 \
|
|
|
|
|
-d u-boot.bin u-boot.imx
|
|
|
|
|
|
|
|
|
|
You can generate directly the image when you compile u-boot with:
|
|
|
|
|
|
|
|
|
|
$ make u-boot.imx
|
|
|
|
|
|
|
|
|
|
The output image can be flashed on the board SPI flash or on a SD card.
|
|
|
|
|
In both cases, you have to copy the image at the offset required for the
|
|
|
|
|
chosen media devices (0x400 for both SPI flash or SD card).
|
|
|
|
|
|
|
|
|
|
Please check Freescale documentation for further details.
|
|
|
|
|
|
|
|
|
|
Board specific configuration file specifications:
|
|
|
|
|
-------------------------------------------------
|
|
|
|
|
1. This file must present in the $(BOARDDIR) and the name should be
|
|
|
|
|
imximage.cfg (since this is used in Makefile).
|
|
|
|
|
2. This file can have empty lines and lines starting with "#" as first
|
|
|
|
|
character to put comments.
|
|
|
|
|
3. This file can have configuration command lines as mentioned below,
|
|
|
|
|
any other information in this file is treated as invalid.
|
|
|
|
|
|
|
|
|
|
Configuration command line syntax:
|
|
|
|
|
---------------------------------
|
|
|
|
|
1. Each command line is must have two strings, first one command or address
|
|
|
|
|
and second one data string
|
|
|
|
|
2. Following are the valid command strings and associated data strings:-
|
|
|
|
|
Command string data string
|
|
|
|
|
-------------- -----------
|
|
|
|
|
IMXIMAGE_VERSION 1/2
|
|
|
|
|
1 is for mx25/mx35/mx51 compatible,
|
|
|
|
|
2 is for mx53 compatible,
|
|
|
|
|
others is invalid and error is generated.
|
|
|
|
|
This command need appear the fist before
|
|
|
|
|
other valid commands in configuration file.
|
|
|
|
|
|
|
|
|
|
BOOT_FROM nand/spi/sd/onenand
|
|
|
|
|
Example:
|
|
|
|
|
BOOT_FROM spi
|
|
|
|
|
DATA type address value
|
|
|
|
|
|
|
|
|
|
type: word=4, halfword=2, byte=1
|
|
|
|
|
address: physycal register address
|
|
|
|
|
value: value to be set in register
|
|
|
|
|
All values are in in hexadecimal.
|
|
|
|
|
Example (write to IOMUXC):
|
|
|
|
|
DATA 4 0x73FA88a0 0x200
|
|
|
|
|
|
|
|
|
|
The processor support up to 60 register programming commands for IMXIMAGE_VERSION 1
|
|
|
|
|
and 121 register programming commands for IMXIMAGE_VERSION 2.
|
|
|
|
|
An error is generated if more commands are found in the configuration file.
|
|
|
|
|
|
|
|
|
|
3. All commands are optional to program.
|
|
|
|
|
|
|
|
|
|
Setup a SD Card for booting
|
|
|
|
|
--------------------------------
|
|
|
|
|
|
|
|
|
|
The following example prepare a SD card with u-boot and a FAT partition
|
|
|
|
|
to be used to stored the kernel to be booted.
|
|
|
|
|
I will set the SD in the most compatible mode, setting it with
|
|
|
|
|
255 heads and 63 sectors, as suggested from several documentation and
|
|
|
|
|
howto on line (I took as reference the preparation of a SD Card for the
|
|
|
|
|
Beagleboard, running u-boot as bootloader).
|
|
|
|
|
|
|
|
|
|
You should start clearing the partitions table on the SD card. Because
|
|
|
|
|
the u-boot image must be stored at the offset 0x400, it must be assured
|
|
|
|
|
that there is no partition at that address. A new SD card is already
|
|
|
|
|
formatted with FAT filesystem and the partition starts from the first
|
|
|
|
|
cylinder, so we need to change it.
|
|
|
|
|
|
|
|
|
|
You can do all steps with fdisk. If the device for the SD card is
|
|
|
|
|
/dev/mmcblk0, the following commands make the job:
|
|
|
|
|
|
|
|
|
|
1. Start the fdisk utility (as superuser)
|
|
|
|
|
fdisk /dev/mmcblk0
|
|
|
|
|
|
|
|
|
|
2. Clear the actual partition
|
|
|
|
|
|
|
|
|
|
Command (m for help): o
|
|
|
|
|
|
|
|
|
|
3. Print card info:
|
|
|
|
|
|
|
|
|
|
Command (m for help): p
|
|
|
|
|
Disk /dev/mmcblk0: 1981 MB, 1981284352 bytes
|
|
|
|
|
|
|
|
|
|
In my case, I have a 2 GB card. I need the size to set later the correct value
|
|
|
|
|
for the cylinders.
|
|
|
|
|
|
|
|
|
|
4. Go to expert mode:
|
|
|
|
|
|
|
|
|
|
Command (m for help): x
|
|
|
|
|
|
|
|
|
|
5. Set card geometry
|
|
|
|
|
|
|
|
|
|
Expert command (m for help): h
|
|
|
|
|
Number of heads (1-256, default 4): 255
|
|
|
|
|
|
|
|
|
|
Expert command (m for help): s
|
|
|
|
|
Number of sectors (1-63, default 16): 63
|
|
|
|
|
Warning: setting sector offset for DOS compatiblity
|
|
|
|
|
|
|
|
|
|
We have set 255 heads, 63 sector. We have to set the cylinder.
|
|
|
|
|
The value to be set can be calculated with:
|
|
|
|
|
|
|
|
|
|
cilynder = <total size> / <heads> / <sectors> / <blocksize>
|
|
|
|
|
|
|
|
|
|
in this example,
|
|
|
|
|
1981284352 / 255 / 63 / 512 = 239.x = 239
|
|
|
|
|
|
|
|
|
|
|
|
|
|
|
Expert command (m for help): c
|
|
|
|
|
Number of cylinders (1-1048576, default 60032): 239
|
|
|
|
|
|
|
|
|
|
6. Leave the expert mode
|
|
|
|
|
Expert command (m for help): r
|
|
|
|
|
|
|
|
|
|
7. Set up a partition
|
|
|
|
|
|
|
|
|
|
Now set a partition table to store the kernel or whatever you want. Of course,
|
|
|
|
|
you can set additional partitions to store rootfs, data, etc.
|
|
|
|
|
In my example I want to set a single partition. I must take care
|
|
|
|
|
to not overwrite the space where I will put u-boot.
|
|
|
|
|
|
|
|
|
|
Command (m for help): n
|
|
|
|
|
Command action
|
|
|
|
|
e extended
|
|
|
|
|
p primary partition (1-4)
|
|
|
|
|
p
|
|
|
|
|
Partition number (1-4): 1
|
|
|
|
|
First cylinder (1-239, default 1): 3
|
|
|
|
|
Last cylinder, +cylinders or +size{K,M,G} (3-239, default 239): +100M
|
|
|
|
|
|
|
|
|
|
Command (m for help): p
|
|
|
|
|
|
|
|
|
|
Disk /dev/mmcblk0: 1967 MB, 1967128576 bytes
|
|
|
|
|
255 heads, 63 sectors/track, 239 cylinders
|
|
|
|
|
Units = cylinders of 16065 * 512 = 8225280 bytes
|
|
|
|
|
Disk identifier: 0xb712a870
|
|
|
|
|
|
|
|
|
|
Device Boot Start End Blocks Id System
|
|
|
|
|
/dev/mmcblk0p1 3 16 112455 83 Linux
|
|
|
|
|
|
|
|
|
|
I have set 100MB, leaving the first 2 sectors free. I will copy u-boot
|
|
|
|
|
there.
|
|
|
|
|
|
|
|
|
|
8. Write the partition table and exit.
|
|
|
|
|
|
|
|
|
|
Command (m for help): w
|
|
|
|
|
The partition table has been altered!
|
|
|
|
|
|
|
|
|
|
Calling ioctl() to re-read partition table.
|
|
|
|
|
|
|
|
|
|
9. Copy u-boot.imx on the SD card
|
|
|
|
|
|
|
|
|
|
I use dd:
|
|
|
|
|
|
|
|
|
|
dd if=u-boot.imx of=/dev/mmcblk0 bs=512 seek=2
|
|
|
|
|
|
|
|
|
|
This command copies the u-boot image at the address 0x400, as required
|
|
|
|
|
by the processor.
|
|
|
|
|
|
|
|
|
|
Now remove your card from the PC and go to the target. If evrything went right,
|
|
|
|
|
the u-boot prompt should come after power on.
|
|
|
|
|
|
|
|
|
|
------------------------------------------------
|
|
|
|
|
Author: Stefano babic <sbabic@denx.de>
|
