[PATCH v2 1/2] ARM: dts: Add Facebook BMC flash layout

[Tao Ren <taoren@fb.com>]

On 11/7/18 4:02 PM, Andrew Jeffery wrote:
>> +partitions {
>> +	compatible = "fixed-partitions";
>> +	#address-cells = <1>;
>> +	#size-cells = <1>;
>> +
>> +	u-boot at 0 {
>> +		reg = <0x0 0x60000>;
>> +		label = "u-boot";
>> +	};
>> +
>> +	u-boot-env at 60000 {
>> +		reg = <0x60000 0x20000>;
>> +		label = "env";
>> +	};
>> +
>> +	fit at 80000 {
>> +		reg = <0x80000 0x1b80000>;
>> +		label = "fit";
>> +	};
>> +
>> +	data0 at 1c00000 {
>> +		reg = <0x1c00000 0x400000>;
>> +		label = "data0";
>> +	};
>> +
>> +	flash0 at 0 {
>> +		reg = <0x0 0x2000000>;
>> +		label = "flash0";
>> +	};
> 
> Is this necessary? Isn't the same thing achieved with the /dev/mtd0 device?

Hi Andrew,

Thank you for the review! The new layout file is needed mainly because of "data0" partition: several facebook platforms use the partition as "persistent" storage.

As for "flash0", technically it's not needed (as you pointed out, /dev/mtd0 covers the entire flash if master_partition is enabled). It's still here to avoid breaking some legacy applications.


Thanks,
Tao Ren