Messages in this thread | | | From | bpqw <> | Subject | RE: [V5 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for Micron spi nor | Date | Fri, 14 Nov 2014 02:06:04 +0000 |
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>> 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
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