[U-Boot] [PATCH 3/3] ARM: configs: cm_fx6: add mtd support

[Christopher Spinrath <christopher.spinrath@rwth-aachen.de>]

Hi Igor,

On 06/22/2016 06:15 PM, Igor Grinberg wrote:
> On 06/19/2016 06:44 PM, Christopher Spinrath wrote:
>> The cm-fx6 module has an on-board spi flash chip. Enable mtd support
>> and the mtdparts command. Also define a default partitioning, add
>> it to the default environment, and enable support to overwrite the
>> partitioning defined in a device tree by it.
>>
>> These changes move the effective default partitioning from the device
>> tree shipped with the vendor kernels to u-boot which becomes the single
>> point of definition for the partitioning for all device tree based
>> kernels (in particular, for the upstream linux kernel which does not
>> have a default partitioning defined in its device tree).
>>
>> Signed-off-by: Christopher Spinrath <christopher.spinrath@rwth-aachen.de>
>> ---
>>  include/configs/cm_fx6.h | 19 ++++++++++++++++++-
>>  1 file changed, 18 insertions(+), 1 deletion(-)
>>
>> diff --git a/include/configs/cm_fx6.h b/include/configs/cm_fx6.h
>> index f054ca8..c839b03 100644
>> --- a/include/configs/cm_fx6.h
>> +++ b/include/configs/cm_fx6.h
> 
> [...]
> 
>> @@ -157,7 +174,7 @@
>>  	"run setupnandboot;" \
>>  	"run nandboot;"
>>  
>> -#define CONFIG_PREBOOT		"usb start"
>> +#define CONFIG_PREBOOT		"usb start;sf probe"
> 
> Probably, this is really needed.
> Care to explain?
>
The sf probe command probes for the spi flash and registers (on success)
the device as nor0. This device is used by mtdparts (cf. the mtdids
variable; it maps the U-Boot name nor0 to the kernel name spi0.0) and
the mtd fixup code in patch 2 (cf. the nodes array; it specifies the
compatible of the flash chip of type NOR #0, i.e. nor0).

Without this all mtdparts commands will fail and the fixup code won't
work because there is nor0 device.

Cheers,
Christopher

>>  
>>  /* SPI */
>>  #define CONFIG_SPI
>>
>