device headers stm32f401xc.h, stm32f401xe.h and stm32f411xe.h define BKPSRAM_BASE also these devices have no backup sram.
The same for [STM32F4xx_DSP_StdPeriph_Lib_V1.8.0]\Libraries\CMSIS\Device\ST\STM32F4xx\Include\stm32f4xx.h where BKPSRAM_BASE (nor BKPSRAM_BB_BASE) are guarded by preprocessor conditionals for the low-end 'F4s, as other IP modules are.
Hi Uwe Bonnes, waclawek.jan,
Thanks for bringing this to our attention.
We review your feedback internally to fix the definition in headers.
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