Banana BPI M2 Zero

[manbehindthemadness]

Has anyone managed to get this to work on a Banana BPI M2 Zero?

When I connect the module the I2C bus stops responding and reports that it’s locked :-/ Any ideas?

i2c i2c-0: mv64xxx_i2c_fsm: Ctlr Error — state: 0x2, status: 0x0,

[manbehindthemadness]

I was able to locate the related portion of the driver code, but have found no solution as of yet.

line 320:

default:
dev_err(&drv_data->adapter.dev,
“mv64xxx_i2c_fsm: Ctlr Error — state: 0x%x, ”
“status: 0x%x, addr: 0x%x, flags: 0x%x\n”,
drv_data->state, status, drv_data->msg->addr,
drv_data->msg->flags);
drv_data->action = MV64XXX_I2C_ACTION_SEND_STOP;
mv64xxx_i2c_hw_init(drv_data);
drv_data->rc = -EIO;
}

https://elixir.bootlin.com/linux/latest/source/drivers/i2c/busses/i2c-mv64xxx.c

[manbehindthemadness]

So I did a full header trace with a DVM and discovered that one of the 3.3v pin-sockets on the header was misshaped, I replaced the header with an extra I had on the bench and I am in business! I will report back once I actually use the module in practice to confirm general compatibility.

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