AM623: AM6231能否满足SPI从机和dma呢

SPI满足不了，工程师建议用GPMC接口或者PRU接口来实现。

That's about 26Mbytes/s, you will not be able to do that using a regular SPI interface.

If you really need that speed and given you are talking to an FPGA (that hopefully you can customize) the use of the GPMC interface can probably get you there (in 16-bit mode), but this may require some work on the SW side. GPMC interfaces are usually well-suited for low-level interface with FPGAs.

Another option is also do leverage the PRU accelerator for FPGA communication, see https://software-dl.ti.com/processor-sdk-linux/esd/AM62X/09_01_00_08/exports/docs/common/PRU-ICSS/Overview.html. How well or how not well this all work work though really depends on your system-level signal flow / processing needs.