I've been struggling with getting u-boot up and running on the Motorola M5282EVB for a month now.
What I want to do: Load u-boot onto the internal flash of the processor. Then have the board boot from internal flash. I also want to be able to access the monitor from the serial port.
My tools are: OS - Mandrake 9.2 Tool Chain - m68k-elf-tools-20030314 tool chain Debugger: - gdb-5.2.1 with "gdb-bdm-20020210.tar.gz" and "gdb-5.2.1.patch" from Cybertec. P&E BDM Interface I can also use CFFlasher from Motorola on a separate Windows machine.
What I've done: I've down loaded U-BOOT from the CVS Tree (I know it needs a pre loader) I'm using Bernhard Kuhn "bdm-m5282evb.tgz" and "loader-m5282evb.tgzr" files for the Pre-Loader. I've down loaded and compiled Motorola's sample initialization code with GCC. I wrote and ran a SDRAM memory test program based on that code. I've tried to use Bernhard's BDM code with U-Boot but I get a bus fault after it tries to loading/run u-boot.
What I don't understand: Other than initializing the processor what does the pre-loader need to do? What is the function of Bernhard's "Loader" Code? Why does the output need to be loaded into /tftpboot, per his instructions?
I think the steps that need to be done are this; 1) using the bdm initialize the board with the preloaded code, and then halt. 2) Load U-Boot code over the bdm. ( How do I know the address that it will be going to?) 3) set the program counter to the 0x20000 4) start executing the monitor code of U-Boot 5) using the u-boot monitor over the serial interface, load u-boot to the flash.
Is this correct?
Any help is appreciated, and I'm willing to update Bernhard's HOW-TO if this works.
Stuart Wood
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