The latest version of Buster does this when I look for SPI bus ports. The older Stretch version doesn't have the 0.0 and 0.1 and everything is scaled up by 1. On either system the scope doesn't show any activity on the SPI0 pins. No CS, no CLK no Data Out. The test program from Exploring Beaglebone with the DI connected to the DO does not behave with the table changed from the output stream to input which makes sense since there isn't any output on the MOSI or MISO pins. Any suggestions on how to get SPI working? debian@beaglebone:~$ uname -a Linux beaglebone 4.19.94-ti-r63 #1buster SMP PREEMPT Fri May 14 16:42:32 UTC 2021 armv7l GNU/Linux debian@beaglebone:~$ ls -l /dev/spi* crw-rw---- 1 root spi 153, 0 May 20 17:24 /dev/spidev0.0 crw-rw---- 1 root spi 153, 1 May 20 17:24 /dev/spidev0.1 crw-rw---- 1 root spi 153, 2 May 20 17:24 /dev/spidev1.0 crw-rw---- 1 root spi 153, 3 May 20 17:24 /dev/spidev1.1 debian@beaglebone:~$ debian@ebb:~$ uname -a Linux ebb 4.14.108-ti-r136 #1stretch SMP PREEMPT Mon Jun 8 15:38:30 UTC 2020 armv7l GNU/Linux debian@ebb:~$ ls -l /dev/spi* crw-rw---- 1 root spi 153, 0 May 20 16:45 /dev/spidev1.0 crw-rw---- 1 root spi 153, 1 May 20 16:45 /dev/spidev1.1 crw-rw---- 1 root spi 153, 2 May 20 16:45 /dev/spidev2.0 crw-rw---- 1 root spi 153, 3 May 20 16:45 /dev/spidev2.1 /dev/spi: total 0 lrwxrwxrwx 1 root root 12 May 20 16:45 0.0 -> ../spidev1.0 lrwxrwxrwx 1 root root 12 May 20 16:45 0.1 -> ../spidev1.1 lrwxrwxrwx 1 root root 12 May 20 16:45 1.0 -> ../spidev2.0 lrwxrwxrwx 1 root root 12 May 20 16:45 1.1 -> ../spidev2.1 debian@ebb:~$ ================================================================================================== debian@beaglebone:~/exploringBB/chp08/spi/spidev_test$ ./spidev_test -D /dev/spidev0.0 spi mode: 0 bits per word: 8 max speed: 500000 Hz (500 KHz) 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 debian@beaglebone:~/exploringBB/chp08/spi/spidev_test$
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