[U-Boot] [PATCH 2/3] ARM: board: cm_fx6: fixup mtd partitions in the fdt

Christopher Spinrath
2016-07-07T13:30:25Z

Hi Nikita,

On 07/07/2016 10:53 AM, Nikita Kiryanov wrote:
> On Wed, Jun 22, 2016 at 07:17:53PM +0300, Igor Grinberg wrote:
>> On 06/19/2016 06:44 PM, Christopher Spinrath wrote:
>>> The cm-fx6 module has an on-board st,m25p compatible spi flash chip
>>> used for u-boot (binary & environment). Overwrite the partitions in
>>> the device tree by the partition table provided in the mtdparts
>>> environment variable, if it is set.
>>>
>>> This allows to specify a kernel independent partitioning in the
>>> environment and provides a convient way for the user to adapt the
>>> partition table.
>>>
>>> Signed-off-by: Christopher Spinrath <christopher.spinrath@rwth-aachen.de>
>>> ---
>>> board/compulab/cm_fx6/cm_fx6.c | 16 +++++++++++++++-
>>> 1 file changed, 15 insertions(+), 1 deletion(-)
>>>
>>> diff --git a/board/compulab/cm_fx6/cm_fx6.c b/board/compulab/cm_fx6/cm_fx6.c
>>> index 712057a..81a7ae2 100644
>>> --- a/board/compulab/cm_fx6/cm_fx6.c
>>> +++ b/board/compulab/cm_fx6/cm_fx6.c
>>
>> [...]
>>
>>> +#ifdef CONFIG_FDT_FIXUP_PARTITIONS
>>> +struct node_info nodes[] = {
>>> + { "st,m25p", MTD_DEV_TYPE_NOR, },
>>
>> Nikita, is this enough for all flashes we assemble on cm-fx6?
>
> Yes, CM-FX6 is using M25PX16 and SST25VF016B, both of which are
> supported by the m25p80.c driver. However, on the mainline branch
> I don't see "m25p" in the list of device ids, and IIRC the request
> is to favor "jedec,spi-nor" as compatible string over device specific
> ones.

Linux is going to use "st,m25p", "jedec,spi-nor" as compatible list
(currently queued for inclusion in v4.8:
https://git.kernel.org/cgit/linux/kernel/git/arm/arm-soc.git/tree/arch/arm/boot/dts/imx6q-cm-fx6.dts?h=next/dt#n123
).

I have chosen "st,m25p" here to cover both the mainline and CompuLab's
device trees (I have seen some where "jedec,spi-nor" is not in the
list). However, if you prefer I will switch to "jedec,spi-nor"
(excluding some device trees) in v2.

Thanks,
Christopher

>
>>
>>> +};
>>> +#endif
>>> +
>>
>> [...]
>>
>> --
>> Regards,
>> Igor.
>>