Raspberry Pi 4 & MESA 7i92

And, did it work fine on the RPi3?

Well... maybe I am a newbie in Mesa card matters, but AFAIK the Mesa docs are very poor and sometimes wrong.

This command from the 7c81 manual is wrong:
./mesaflash --device 7c81 --addr /dev/spidev0.0 --write 7c81_5abobx2d.bit

After contact Mesa Electronics a guy told me that it is wrong. I have to try this:
./mesaflash --device 7c81 --addr /dev/spidev0.0 --spi --readhmid
But this command does not flash the firmware on the board as the manual states, it just query the default board configuration I think.

Is there any tutorial to fully configure a Mesa 7c81 for LinuxCNC?

Thanks!

did you try:

mesaflash --help

Yep! Works like a charm.

And I try this:
./mesaflash --device 7c81 --addr /dev/spidev0.0 --spi --readhmid

And throws this:
unable to set bpw32, fallback to bpw8
Configuration Name: HOSTMOT2

General configuration information:

BoardName : MESA7C81
FPGA Size: 9 KGates
FPGA Pins: 144
Number of IO Ports: 3
Width of one I/O port: 19
Clock Low frequency: 100.0000 MHz
Clock High frequency: 200.0000 MHz
IDROM Type: 3
Instance Stride 0: 4
Instance Stride 1: 64
Register Stride 0: 256
Register Stride 1: 256

Modules in configuration:

Module: DPLL
There are 1 of DPLL in configuration
Version: 0
Registers: 7
BaseAddress: 7000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: WatchDog
There are 1 of WatchDog in configuration
Version: 0
Registers: 3
BaseAddress: 0C00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: IOPort
There are 3 of IOPort in configuration
Version: 0
Registers: 5
BaseAddress: 1000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: QCount
There are 1 of QCount in configuration
Version: 2
Registers: 5
BaseAddress: 3000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: SSerial
There are 1 of SSerial in configuration
Version: 0
Registers: 6
BaseAddress: 5B00
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 64 bytes

Module: StepGen
There are 10 of StepGen in configuration
Version: 2
Registers: 10
BaseAddress: 2000
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: PWM
There are 3 of PWM in configuration
Version: 0
Registers: 5
BaseAddress: 4100
ClockFrequency: 200.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Module: LED
There are 1 of LED in configuration
Version: 0
Registers: 1
BaseAddress: 0200
ClockFrequency: 100.000 MHz
Register Stride: 256 bytes
Instance Stride: 4 bytes

Configuration pin-out:

IO Connections for P1+Serial
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

0 0 IOPort PWM 0 PWM (Out)
0 1 IOPort None
0 2 IOPort StepGen 0 Step/Table1 (Out)
0 3 IOPort None
0 4 IOPort StepGen 0 Dir/Table2 (Out)
0 5 IOPort None
0 6 IOPort StepGen 1 Step/Table1 (Out)
0 7 IOPort None
0 8 IOPort StepGen 1 Dir/Table2 (Out)
0 9 IOPort StepGen 2 Step/Table1 (Out)
0 10 IOPort StepGen 2 Dir/Table2 (Out)
0 11 IOPort StepGen 3 Step/Table1 (Out)
0 12 IOPort StepGen 3 Dir/Table2 (Out)
0 13 IOPort None
0 14 IOPort QCount 0 Quad-A (In)
0 15 IOPort QCount 0 Quad-B (In)
0 16 IOPort QCount 0 Quad-IDX (In)
0 17 IOPort SSerial 0 TXData0 (Out)
0 18 IOPort SSerial 0 TXData1 (Out)

IO Connections for P2+Serial
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

0 19 IOPort PWM 1 PWM (Out)
0 20 IOPort None
0 21 IOPort StepGen 4 Step/Table1 (Out)
0 22 IOPort None
0 23 IOPort StepGen 4 Dir/Table2 (Out)
0 24 IOPort None
0 25 IOPort StepGen 5 Step/Table1 (Out)
0 26 IOPort None
0 27 IOPort StepGen 5 Dir/Table2 (Out)
0 28 IOPort StepGen 6 Step/Table1 (Out)
0 29 IOPort StepGen 6 Dir/Table2 (Out)
0 30 IOPort None
0 31 IOPort None
0 32 IOPort None
0 33 IOPort None
0 34 IOPort None
0 35 IOPort None
0 36 IOPort SSerial 0 TXEn0 (Out)
0 37 IOPort SSerial 0 TXEn1 (Out)

IO Connections for P7+Serial
Pin# I/O Pri. func Sec. func Chan Pin func Pin Dir

0 38 IOPort PWM 2 PWM (Out)
0 39 IOPort None
0 40 IOPort StepGen 7 Step/Table1 (Out)
0 41 IOPort None
0 42 IOPort StepGen 7 Dir/Table2 (Out)
0 43 IOPort None
0 44 IOPort StepGen 8 Step/Table1 (Out)
0 45 IOPort None
0 46 IOPort StepGen 8 Dir/Table2 (Out)
0 47 IOPort StepGen 9 Step/Table1 (Out)
0 48 IOPort StepGen 9 Dir/Table2 (Out)
0 49 IOPort None
0 50 IOPort None
0 51 IOPort None
0 52 IOPort None
0 53 IOPort None
0 54 IOPort None
0 55 IOPort SSerial 0 RXData0 (In)
0 56 IOPort SSerial 0 RXData1 (In)

So I think the connectivity is ok. But I don't understand this part:
unable to set bpw32, fallback to bpw8 (maybe something wrong)

Anyway, I don't know what's next to get all the pieces together.

unable to set bpw32, fallback to bpw8 (maybe something wrong)

Just means the device driver or RPI hardware does not support 32 bits per word mode,
only byte mode. This does not affect operation (other than perhaps being a bit slower).

To write to the flash EEPROM on a 7C81, you use the --write command

unable to set bpw32, fallback to bpw8

Ok, thanks for the explanation!

I did it, but it didn't work:

./mesaflash --device 7c81 --addr /dev/spidev0.0 --write 7c81_5abobx2d.bit

The command fails, it throws:
ERROR: you must select transport layer for board
No 7C81 board found

Do I have to install a driver?
I mean something like:

sudo apt−get install hostmot2−firmware−7c81

Because I tried, but no package found.