[OT] write flash on MPC5200 board via jtag
jwittrock at maginst.com
Wed Jul 23 22:21:49 EST 2008
I am using http://urjtag.org/ UrJtag to do accomplish this. I have used it
with both a Wiggler clone and an Altera UsbBlaster as the physical JTAG
interface on both a Linux and Windows (cygwin) host. The only problem is
that this approach is very slow, so I wrote a small (~8kb) "bootstrap"
program which is first put into flash. This small program then handles
programming u-boot to flash over a serial interface. Once u-boot is in
place, I use it to program the rest of flash.
Some JTAG tools actually place a small application in the target devices
ram, then this application allows much faster programming of an attached
flash device. This requires more information about the COP/BDM interface
than is published in the MPC5200B user manual or data sheet. I haven't used
the Abatron tools, so maybe they do this. In the case of UrJtag, it is
simply fiddling with bus signals using boundry scan, so it is excruciatingly
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