Last Week Activities

Technical talk about Inter-Vehicular Communication (IVC) was held in UNITEN last Wednesday. We have invited Dr. Daniel Wong, one of the guest editors from IEEE Wireless Communication Magazine for special issue on “Inter-Vehicular Communications” and his student, Miss Bhawani. There are many similarities between the ad-hoc networks and vehicular-to-vehicular communication. However, there are different problems faced in VANET, such as rapid changing of topology. The speakers addressed two important research issues, security and routing algorithm. More on IVC can be found here.

Last week, I have been assigned a temporary task regarding WiMax solution. This solution consists of three main boards: processor board, modem board and RF board, connected via passive PCI backplane. I am asked to reengineer back the processor board. This board comes along with Intel IXP425 network processor running Timesys Linux. Since the tools are not ready for the time being, I worked most of time identifying the mechanism for re-loading the binary. The board contains a 16M Bytes boot flash that is used to store the bootloader, kernel image and root file system. The bootloader, Redboot was successfully built using the available tar package. However, the linux image is not built for the time being due to the unavailability of Timesys SDK. The JFFS2 root file system was built using the buildroot by choosing the uClibc library which is smaller than the libc. I found out that this tool is really helpful and you can add any new modules to your root file system pretty easy. Anyway, you have to add all the necessary device nodes by yourself. The Abatron BDI2000 will be used to download the bootloader. Subsequently, the redboot contains the command to transfer the image and root file system via TFTP. There are 5 MTD partitions in the flash and thus the root file system is mapped to root=/dev/mtdblock/2. To ease the development phase, mounting the file system is done via NFS.

Name FLASH addr Mem addr Length Entry point
RedBoot 0x50000000 0x50000000 0x00020000 0x00000000
zImage 0x50040000 0x01600000 0x00120000 0x01600000
RfsLinux 0x50160000 0x50160000 0x00E60000 0x00000000
RedBoot config 0x50FC0000 0x50FC0000 0x00001000 0x00000000
FIS directory 0x50FE0000 0x50FE0000 0x00020000 0x00000000