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How (in linux) to flash regions of SPI connected flash on the 1808?

Chris Gray
Intellectual 365 points

I have an 1808 with SPI connected flash - I do not need a full filesystem but would like to be able to write a small region of flash (by address).  basically I need a few kilobytes for an application configuration blob

I've been very successful using uBoot,  I'm hoping for a similar setup (read/write) but in linux

is there a 1808 linux driver for SPI connected flash?  whats the device name (is it a standard driver?)

  • 0
    Intellectual 365 points

    here is a similar question - cross linking for the next guy,  in hopes someone knows the answer :)

    http://e2e.ti.com/support/embedded/linux/f/354/p/163569/801167.aspx#801167

  • 0
    Intellectual 365 points

    I think I have a working solution - I'm hoping to get feedback if this is correct/etc

    a) from the kernel add MTD support (Drivers->Memory Technology Devices (MTD)->MTD partitioning and Command line partition table parsing

    b) from uBoot add partition table info to CONFIG_BOOTARGS (mtdparts=m25p80:192K(u-boot)ro,64K(u-boot-args)ro,7936K(Linux))

    c) from linux create the devnodes
           1) mknod /dev/mtd0 c 90 0

           2) mknod /dev/mtd1 c 90 2   <-- note this is 2

           3) mknod /dev/mtd2 c 90 4   <-- note this is 4

    the end result ends up being three partitions that show up by cat'ing /proc/mtd -  further they can be erased/written to using the flash_xxx applets busybox