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HyperFlash devices are compliant with CFI AMD/Fujitsu Extended Command Set (0x0002) for flash operations, therefore drivers/mtd/chips/cfi_cmdset_0002.c can be used as is. But these devices do not support DQ polling method of determining chip ready/good status. These flashes provide Status Register whose bits can be polled to know status of flash operation. Cypress HyperFlash datasheet here[1], talks about CFI Amd/Fujitsu Extended Query version 1.5. Bit 0 of "Software Features supported" field of CFI Primary Vendor-Specific Extended Query table indicates presence/absence of status register and Bit 1 indicates whether or not DQ polling is supported. Using these bits, its possible to determine whether flash supports DQ polling or need to use Status Register. Add support for polling Status Register to know device ready/status of erase/write operations when DQ polling is not supported. Print error messages on erase/program failure by looking at related Status Register bits. [1] https://www.cypress.com/file/213346/download Signed-off-by: Vignesh Raghavendra <vigneshr@ti.com> Reviewed-by: Tokunori Ikegami <ikegami.t@gmail.com> Signed-off-by: Miquel Raynal <miquel.raynal@bootlin.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.