RE: [V5 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for Micron spi nor

bpqw
2014-11-14T02:06:55Z

>> This maybe your spi controller is still extended mode, Once EVCR bit 7
>> is set to 0, the spi nor device will operate in quad I/O.Command-address-data line is 4-x-4.
>> So after send WRITE EVCR command , spi controller also must transfer
>> to quad I/O Mode,and set its Command-address-data line also Should be 4-x-4 .

>Thanks, this helped. I added some code to snoop the command stream for WRITE EVCR with quad mode,
>and then set up the quad mode in the controller. Seems kinda ugly, but working now.

>-Graham

Yes ,if enable spi nor Quad I/O, firstly, must check spi controller if support Quad I/O protocol,
and after enable spi nor Quad I/O mode ,spi controller also must be transferred to Quad I/O protocol.
Their two side must be matched together.
Maybe spi controller can do this changes.

Hi,Brian

Can you give me some tips about this patch? Thanks!

-Bean Huo