[U-Boot-Users] u-boot hangs after relocating itself to ram

Andre Puschmann andre.puschmann at stud.tu-ilmenau.de
Tue Nov 28 19:23:35 CET 2006

Hey folkes,
I have ported u-boot to a custom board based on a freescale mpc5200. I
can successfully copy u-boot into flash using the connected bdi2000 and
we get some output on the debug port. It seems that the board crashes
right after relocation to ram (see output). I already
read the regarding faq entry but I'm not sure if this problem has
something to do with faulty sdram initialization.

this is the output than comes up on the console:

20030.56> U-Boot 1.1.6-ge4bbd8da-dirty (Nov 27 2006 - 18:46:24)
20030.56> CPU:   MPC5200 v1.2, Core v1.1 at 396 MHz
20030.56>        Bus 132 MHz, IPB 66 MHz, PCI 33 MHz
20030.57> Board: MPC5200 ECU
20030.57> I2C:   85 kHz, ready
20030.57> DRAM:   8 MB
20030.57> FLASH:

I'm using eldk 4.0 + insight to debug the problem. I can single-step
through the code up to the point where it branches to sdram.
After relocation I loaded a new symbol file width offset 0x7d8000, since
this is the dest-address for relocate_code().

If I continue running from that point on the board crashes at 0x7dc314
which is in function loadtask(). In assembler the code looks like this:
"0x7dc314	<loadtask+48>:		lwz     r11,-32768(r30)"

Can this be a sdram related problem or what might cause this behavior?

Any comments and suggestions are more than welcome.

Best regards,

André Puschmann

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