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;

This will not work, as default value for CR1(N)V is 0 and that is the value
one gets with incorrect addr_width as well.

-- 
Best regards,
Alexander Sverdlin.
______________________________________________________
Linux MTD discussion mailing list
http://lists.infradead.org/mailman/listinfo/linux-mtd/