Re: [PATCH v3 2/3] mtd: spi-nor: add 4bit block protection support

[Michael Walle <michael@xxxxxxxx>]

Am 19. Februar 2020 12:23:24 MEZ schrieb Jungseung Lee <js07.lee@xxxxxxxxxxx>:
>Hi,
>
>2020-02-19 (Wed), 12:08 +0100, Michael Walle:
>> Am 2020-02-19 11:50, schrieb Jungseung Lee:
>> > Hi, Tudor and all
>> > 
>> > 2020-02-10 (Mon), 11:26 +0000, Tudor.Ambarus@xxxxxxxxxxxxx:
>> > We could also find a few flashes that does not following the
>> > overall
>> > logic. For example, "en25qh256" and "en25qh16" which was
>> > manufactured
>> > by EON. They are always following way (2) no matter what the number
>> > of
>> > slot is. It seems that it could be handled like below with custom
>> > hook
>> > later.
>> 
>> For these two flashes, BP3 is just the TB bit. So it should already
>> work 
>> with the current logic.
>> 
>
>Refer to what I mentioned before in the mail I talked with you.
>
>>>It is mixed. Let's compare "en25qh128" from EON with "w25q128jv" from
>>>Winbond. They have the same capacity(128MBit) and also supporting
>>>3bit
>>>block protection. (Note that the named BP3 bit of "en25qh128" is
>>>working exactly same with T/B bit.)
>
>>>"en25qh128" is following (2) and "w25q128jv" is following (1). It
>>>seems
>>>impossible to distinguish them by the flash size or the number of
>>>protection bits. 

Oh, correct. but why should it then be a problem? Its like all, the other flashes.

-michael 

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