lokowich wrote: > We're working on bringing up a MPC5200B version of our original MPC5200 > board using U-Boot 1.1.4 configured for Icecube/Lite5200B. Other than > the CPU, the board is identical. The bootloader crashes just after > relocation to RAM, often with a Program Check Exception, typically a > memory corruption issue. I noticed failures at different stages after > relocation based on content, suggesting problems with upper SDRAM. If I > force the initram to 1/2 the determined size (64MB instead of 128MB), > then everything works well through kernel load and initialization. > We've added termination resistors to improve AD signals, to no avail. > Memory tests work fine too. Any help is appreciated. >
Assuming your RAM chips are fine, are you setting the SDelay register (MBAR + 0x0190)? If not, this can lead to a strange hangs similar to the described. For details please see the current U-Boot's initdram() for icecube, and AN3221. Rafal _______________________________________________ Linuxppc-embedded mailing list Linuxppc-embedded@ozlabs.org https://ozlabs.org/mailman/listinfo/linuxppc-embedded
