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

[Christopher Spinrath]

Hi Igor,

On 06/23/2016 11:03 AM, Igor Grinberg wrote:
> 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?
>

Sure, I will add it.

Thanks,
Christopher