Kontron AM4211 - Manual (Page 54)

39 AM4211
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After Linux startup, the flash is divided into 8 partitions (mtd0-mtd7) associated to the physical addresses as
shown in the AM4211 partition scheme below. Note that association of MTD partitions to image depends on
the started image as shown above.
Table 5-10:On-board 128 MB NOR Flash layout
When shipped from factory, image0 and image1 contain identical bootloader and firmware images and
image0 system is booted by default. Image1 serves as a backup system which is started in case that image0
fails for some reason. It is recommended to always boot and work from image0 and leave image1 firmware
untouched. This allows easy activation of the original firmware in case of any errors or corruption in the
active image.
5.2.0.1 Image swap using bootloader predefined commands
The current firmware image is displayed during startup. It can be changed from the bootloader. Below are the
available commands to change boot image. Those commands can be used in the U-Boot.
•Change to image 0
Kontron T5519#
run activate_image0
•Change to image 1
Kontron T5519#
run activate_image1
Using one of these commands, the board will immediately boot the selected image.
5.2.0.2 Image swap using ipmitool
Image swap can also be achieved using the ipmitool from the Linux shell of the board. The following
command syntax must be used (IMAGE: 0 or 1):
~ #
ipmitool raw 0x3e 0x20 0x00 <IMAGE>
It is possible to invoke the ipmitool with the same parameters from the AMC carrier that holds the AM4211 or
even from external server provided that the ipmitool installed supports the Kontron OEM extensions.
Physical Address Offset in flash Size Linux Partition Designation Description
0x17C00000 0 896KiB mtd0 uboot Active bootloader image
0x17CE0000 0xE0000 256KiB mtd1 env
Active bootloader configuration
variables
0x17D20000 0x120000 40960KiB mtd2 kernel_rootfs Active linux and Root file system
0x1A520000 0x2920000 23424KiB mtd3 user_jffs2 Active user filesystem
0x1BC00000 0x4000000 896KiB mtd4 uboot_backup Backup bootloader
0x1BCE0000 0x40E0000 256KiB mtd5 env_backup
Backup bootloader configuration
variables
0x1BD20000 0x4120000 40960KiB mtd6 kernel_rootfs_backup Backup Linux and root filesystem
0x1E520000 0x6920000 23424KiB mtd7 user_jffs2_backup Backup user file system