Re: [imx27 - mcp251x] MCP251x does not work in static ?

[Marc Kleine-Budde <mkl@pengutronix.de>]

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On 04/10/2013 03:07 PM, Mylene Josserand wrote:
> When I compile the driver in static, the kernel stopped booting. With 
> some printk, the driver is blocked at the function "spi_write" of the 
> function "mcp251x_hw_reset". The dmesg with my outputs :
> 
> "
> spi_imx imx27-cspi.0: master is unqueued, this is deprecated
> spi_imx imx27-cspi.0: probed
> CAN device driver interface
> mcp251x_can_init
> mcp251x_clean
> mcp251x_can_probe
> mcp251x_hw_probe
> mcp251x_hw_reset
> mcp251x_hw_reset : spi_write : start
> "

Does it hang here?

http://lxr.linux.no/linux+v3.8.6/drivers/net/can/mcp251x.c#L624

Is this the first spi transfer that occurs in the driver?

> I thought that it was a spi problem because of the warning "master is 
> unqueued, this is deprecated" but in fact the spi works.
> One surprising thing (for me) is that the MCP251x compiled in module is 
> probed ! (I did not test it yet)

If it's the first spi transfer in the driver that hangs and if the
mcp251x works if loaded as a module, there is probably some
initialisation missing. Look for stuff that gets initialized after the
mcp251x would have been loaded if compiled into the kernel. Make a
"diff" between the bootload with mcp251x compiled into the kernel and
without. Other usual suspects are: clocks, pinmux (spi _and_ the mcp251x
dedicated IRQ line), gpio setup.

Marc

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