[ELDK] uboot MPC5200B DDR memsize hangs

Chris Alfred (Internode) chrisalfred at internode.on.net
Wed Oct 14 10:23:53 CEST 2009

We are using MT46V8M16-6T DDR on a design very similar to the 
Lite5200B with ELDK4.1 / UBoot 1.2.0.

UBoot starts and we see serial output; but UBoot hangs on the very 
first read from DDR which is done in memsize.c:get_ram_size().

The serial output is:
    CPU:   MPC5200 v2.2, Core v1.4 at 462 MHz
           Bus 132 MHz, IPB 66 MHz, PCI 33 MHz
    Board: JKC5200N7
    I2C:   85 kHz, ready

We are pretty sure the DDR configuration is correct, but we would have 
thought this would not cause get_ram_size() to hang - merely return 0 
or incorrect memory size.

Any ideas?


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