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Am437x增加spi驱动支持，在做loop-back test硬件上没有短接MISO,MOSI为什么可以收到正确的数据？spidev spi1.0: TXS timed out是什么情况？

junxue chen


root@myd_c437x mmcblk1p1# ./spidev_test -D /dev/spidev1.0 
of_dma_request_slave_channel: dma-names property of node '/ocp/spi@48030000' missing or empty
spidev spi1.0: not using DMA for McSPI
of_dma_request_slave_channel: dma-names property of node '/ocp/spi@48030000' missing or empty
spidev spi1.0: not using DMA for McSPI
of_dma_request_slave_channel: dma-names property of node '/ocp/spi@48030000' missing or empty
spidev spi1.0: not using DMA for McSPI
spi mode: 0
bits per word: 8
max speed: 500000 Hz (500 KHz)
spidev spi1.0: TXS timed out
FF FF FF FF FF FF 
40 00 00 00 00 95 
FF FF FF FF FF FF 
FF FF FF FF FF FF 
FF FF FF FF FF FF 
DE AD BE EF BA AD 
F0 0D