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

[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. 

> -michael
> 
> 

Thanks,


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