[U-Boot-Users] Question about smc911x driver (16/32 Bit support)

[Jens Gehrlein]

Hi Ben,

Ben Warren schrieb:
> Hi Jens,
> 
> On Tue, Apr 22, 2008 at 5:18 AM, Jens Gehrlein <sew_s at tqs.de> wrote:
>> Hi,
>>
>>  in the source code there is a preprocessor directive
>>  #error "SMC911X: Only 32-bit bus is supported".
>>
>>  We use a LAN9215i, which has a 16 Bit data interface only, connected to
>>  an i.MX31.
>>
>>  The LAN9215 is in the driver's ID list.
>>
>>  According to the data sheet accesses have to be 2x16 Bit to build the
>>  device's internal 32 Bit format.
>>
>>  What does this non-32-Bit exclusion exactly mean?
>>  Will the driver work on our HW configuration?
>>
> This #error message was included, because if you look at the code
> you'll see that the read/write accessors are 32-bit operations *(u32 *
> ).  These may or may not work on your configuration.  It should be
> trivial to write accessors for a 16-bit bus, but nobody had hardware
> to try it out on.  Please do so and submit a patch.

Yes, it seems, that we just need two additional functions which split a 
32 Bit access into two 16 Bit accesses. That should be easy. I'm going 
to create a patch as soon as I get the HW. But first I want to test 
whether the processor splits itself automatically.

Thank you very much.

Best Regards,
Jens