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Any STM32F407/405 RCC_xx differences?

Question asked by PICguy on Jul 28, 2014
Latest reply on Jul 28, 2014 by Clive One
“My hardware guy” bought 2 Olimex H-405 boards.  (He wanted 64-pin QFP.) Code loads and runs using an external ST-LINK/V2 and its 20-pin cable. Or rather runs some then freezes.

After setting SysClk to 168 MHz then setting RCC_APB1ENR worked okay but when setting RCC_APB1ENR two instructions later the debugger froze.  I got much the same effect setting both of those and other RCC_xxxENR settings before setting SysClk to 168 MHz. But this time it froze after setting SW=2.  (Done with strb to the low byte of RCC_CFGR.  HPRE was never anything other than zero.)

Yet on my STM32F407 Discovery board it works just fine either way.  Any ideas?