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CONFIG_SPI_DW_BT1_DIRMAP: Directly mapped Baikal-T1 Boot SPI flash support

General informations

The Linux kernel configuration item CONFIG_SPI_DW_BT1_DIRMAP:

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Directly mapped SPI flash memory is an interface specific to the Baikal-T1 System Boot Controller. It is a 16MB MMIO region, which can be used to access a peripheral memory device just by reading/writing data from/to it. Note that the system APB bus will stall during each IO from/to the dirmap region until the operation is finished. So try not to use it concurrently with time-critical tasks (like the SPI memory operations implemented in this driver).



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