Kontron AM4220 - Manual (Page 68)

53 AM4220
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5.2.3.2 Update from WindRiver Linux Shell
To update the boardloader along with the Linux kernel BSP using the kex-flashimage tool the sequence
described in chapter 5.3.4.2:
5.3 Board Firmware
The system is delivered with a bootloader and Linux OS preinstalled on the on-board 128MB NOR flash. The
system will boot by default from this flash, which is directly connected to the bootbus of the Cavium Octeon
CPU. In addition to the on-board flash the board supports a mounted USB flash drive that can be used for
application data. This USB flash drive is not used for booting in the default configuration.
The on-board flash is logically divided into two 64MB sections each consisting of 512 flash sectors. They are
referred to as image0 and image1. The table 5-13 shows the physical addresses and associated flash sectors
for each image once the board has booted on image 0.
Table 5-12:Fabric Default Flash Sector to Image Association
Image0 and image1 can be swapped by a simple IPMI command. Physically, the uppermost address line of the
flash device is inverted in this case. Flash sector to logical image association remains the same; however
physical address to logical image association will be swapped as shown below
Table 5-13:Swapped Flash Sector to Image Association
As the Octeon CPU always starts booting from the first physical address in the flash, image0 system is started
in the first case and image1 in the second.
After Linux startup, the flash is divided into 10 partitions (mtd0-mtd9) associated to the physical addresses
as shown in the AM4220 partition scheme below. Note that association of MTD partitions to image depends
on the started image as shown above.
Table 5-14:On-board 128 MB NOR Flash layout
Physical Address Range Linux MTD Partitions Flash Sectors Logical Image
0x17C00000 – 0x1BBFFFFF mtd0 – mtd4 0 – 511 Image0
0x1BC00000 – 0x1FBFFFFF mtd5 – mtd9 512 – 1023 Image1
Physical Address Range Linux MTD Partitions Flash Sectors Logical Image
0x17C00000 – 0x1BBFFFFF mtd0 – mtd4 512 – 1023 Image1
0x1BC00000 – 0x1FBFFFFF mtd5 – mtd9 0 – 511 Image0
Physical address Offset in flash Size Linux parti-
tion Designation Description
0x17C00000 0 512KiB mtd0 uboot0 Active bootloader image
0x17C80000 0x80000 128KiB mtd1 env0a Redundant bootloader environment
0x17CA0000 0xA0000 128KiB mtd2 env0b Redundant bootloader environment
0x17CC0000 0xC0000 32384KiB mtd3 data0a
First data partition (typically read-only
OS)