It seems that a prolonged sequence of accesses is required to cause the
problem.
Heating problem? It can cause strange problems.
The following is the DRAM initialization data from Uboot:
DRAM: Initializing DDR: number of banks = 2 DDR: DDR I bank density = 0x20000000 Number of Row Address Bits - 13 Number of Col Address Bits - 11
DDR: cs0_bnds = 0x0000001f DDR: cs0_config = 0x80000103 (...) DDR: err_sbe = 0x00ff0000 DDR: sdram_cfg_2 = 0x00000000
The configuration of the DDR is rather complex, specially the timming parameters and, of course, it depends a bit on the DDR in question. This is usually done by the hardware team, they have to give the parameters. Where I work I have a hardware collegue specialized in this kind of configuration and it took him some time to fully analyse and optimize this parameters for a MPC8541E based custom board.
Best Regards