The following section shows the Frequently Asked Questions (FAQ) of JH7110 SPI.
DMA Failure
Problem description: DMA mode failed to load logs from the
kernel.
The following image displays an example failure screen. Figure 1. DMA Failure
Analysis: This is a normal case, since DMA is not configured
in device tree. There are fewer DMA channels and cannot fully meet the demand, and
SPI does not use the DMA channel to transfer.
Solution: If you want to use DMA channel to transfer, you
should change the device tree and add DMA configuration.
The highlighted section in the following image provides an example solution. Figure 2. DMA Failure Solution
