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

[Igor Grinberg]

On 06/22/2016 10:27 PM, Christopher Spinrath wrote:
> 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 at 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.

Thanks for the explanation!
That sounds to me like this should go away once we have the DM in place
for spi flash and MTD (added Simon to Cc).
Meanwhile, may be a short notice in the commit message?

-- 
Regards,
Igor.