Messages in this thread | | | Date | Wed, 7 Jan 2015 11:36:07 -0800 | From | Brian Norris <> | Subject | Re: [V7 PATCH 1/1] driver:mtd:spi-nor: Add quad I/O support for Micron spi nor |
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On Wed, Dec 17, 2014 at 07:35:45AM +0000, Bean Huo 霍斌斌 (beanhuo) wrote: > This patch adds code which enables Quad I/O mode on Micron SPI NOR flashes. > > For Micron SPI NOR flash, enabling or disabling quad I/O protocol can be done > By two methods, which are to use EVCR(Enhanced Volatile Configuration Register) > and the ENTER QUAD I/O MODE command. There is no difference between these two > methods. Unfortunately, for some Micron spi nor flashes, there no ENTER Quad I/O > command(35h),such as n25q064.But for all current Micron spi nor, if it support > quad I/O mode, using EVCR definitely be supported. It is a recommended method to > enable Quad I/O mode by EVCR, Quad I/O protocol bit 7.When EVCR bit 7 is reset > to 0,the SPI NOR flash will operate in quad I/O mode. > > This patch has been tested on N25Q512A and MT25TL256BAA1ESF.Micron spi nor of > spi_nor_ids[] table all support this method. > > Signed-off-by: bean huo <beanhuo@micron.com> > Acked-by: Marek Vasut <marex@denx.de>
Pushed to l2-mtd.git. Thanks.
Brian
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