What is PIO mode in SPI?

[raghun]

Hi,
I have u-boot data saved in spi flash. during system boot up SPI flash controller in the SoC reads the u-boot data into DDR. Can any one explain what exactly is PIO mode in SPI. How is it different from SPI modes 0 & 3.

Thanks & Regards
Raghu Nandan Ravi

 

[FvM]

That's nothing SPI specific. PIO mode is used in memory interface specifications in contrast to DMA mode, it's originated from PATA hard disk interface.

 

[basisk]

The SPI bus is by packaging one or the omap2_mcspi controller transfers less then 8 bytes use PIO mode . I've dropped the two patches that are already applied in Mark's SPI tree .


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