Re: [PATCH] mtd: spi-nor: Provide default address width and latency for map selection

["Sverdlin, Alexander (Nokia - DE/Ulm)" <alexander.sverdlin@xxxxxxxxx>]

Hi!

On 03/12/2018 09:23, Boris Brezillon wrote:
>> This is the same instruction 65h which is used to read regs and which
>> appears in SMPT headers, it is a chicken-egg problem.
> Oh, right, I remember now. Not a smart decision from Spansion :-/.
> 
>> Therefore, I don't know if it's possible to provide smarter heuristics
>> here.
> Maybe:
> 
> ref_cr1 = read_CR1_using_RDCR()
> 
> for_each_possible_dummy_and_addr_width
> 	cr1 = read_CR1_using_RDAR()
> 	if (cr1 == ref_cr1)
> 		break;
> 
> 
>> But without it Spansion S25FS-S Family is now broken by SFDP.
> Do you have [1] in your tree? IIRC, this fixed Yogesh issue.
> 
> [1]https://patchwork.ozlabs.org/patch/994765/

This is definitely unrelated, in my case SMPT is happily processed leading
to completely wrong mapping because command 65h with addr_width == 0 always
returns 0.

-- 
Best regards,
Alexander Sverdlin.
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