I have a Raspberry Pi 3b+ successfully talking to a Mesa 7c81, but am now trying to get it working with a 7i90hd. I have a very compact pcb made to go from the 2x20 header on the pi to the 2x13 header on the 7i90hd. It is wired:
Signal Rpi 7i90hd SDI 19 13 SDO 21 15 SCK 23 11 SCS 24 17 +5V 2,4 26 GND 6,9,20,25,30,34,39 10,12,14,16,18,20,22,24 My test is: $ mesaflash --device 7i90hd --addr /dev/spidev0.0 --spi --readhmid Response is: unable to set bpw32, fallback to bpw8 Unexpected cookie at 0100..0110: 00000000 00000000 00000000 No 7I90HD board found Since a 7c81 works, it would seem my software setup is ok. The problem would seem to lie with either my little adapter board or with the 7i90hd. I have a bypass cap right between pins 4 and 6 on the RPi connector (22uF 0805 ceramic). Do I need to use a four layer board to have sufficient ground plane? I have copper pour on the top and bottom of the board, but it did not go between pins of the connectors. Any suggestions? Thanks, -- Ralph
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