On 01/12/2017 19:36, David Hendricks wrote: > > > On Fri, Dec 1, 2017 at 12:11 AM, Andriy Gapon <[email protected] > <mailto:[email protected]>> wrote: > > > Hello. > > I wonder if anyone here encountered an SPI flash controller (master) that > has a > three register interface where the first register is used for control and > status > bits, the second register is used for setting a flash address (if one is > needed) > and the third is used for reading or writing the flash data. A specific > operation is requested by writing an SPI opcode into the control register. > The interface seems to be rather simple, but I couldn't find any driver > that > implements access to anything like that or any documentation that would > describe > a similar interface. > > Does it sound familiar to anyone? > Could anyone give me some hints / pointers? > > > Is this an interface that you've actually used before? It sounds too > simplistic > since at the very least you'd also need to set the number of bytes to > transfer, > the direction, and have some control over chip select.
Likely, those things are set in the control register, but I don't know the exact meaning of the bits. Also, some status bits are checked in the same register to make sure that the operation is completed. I can make some guesses, but I'd rather find documentation if possible. Meanwhile, I also looked at Linux drivers and this one seems to be somewhat similar but still different: http://elixir.free-electrons.com/linux/latest/source/drivers/spi/spi-falcon.c See SFCMD / SFADDR / SFDATA. -- Andriy Gapon _______________________________________________ flashrom mailing list [email protected] https://mail.coreboot.org/mailman/listinfo/flashrom
