NANO EMMC SPI signal seen on the scope is abnormal

[ShaneCCC]

Could you try connect SPI0 and SPI1 to do the device loopback test to check the scope too.

Thanks.

Have reference to below relative topic.

How to set to spi slave mode

I still get the error though. Instead of flashing by modifying pinmux, I used devmem2 to temporarily change the register value. [Screenshot from 2020-10-07 15-22-52] when checking dmesg, the following error appears. [ 280.340212] spi-tegra124-slave 3230000.spi: Tx is not supported in mode 0 [ 280.340215] spi-tegra124-slave 3230000.spi: spi can not start transfer, err -22 [ 280.340301] spi_master spi2: failed to transfer one message from queue