[meta-xilinx] u-boot/UBIFS

[Edward Wingate]

On Wed, Sep 23, 2015 at 8:31 AM, Edward Wingate <edwingate8 at gmail.com> wrote:
> On Wed, Sep 23, 2015 at 7:56 AM, Joe Hershberger
> <joe.hershberger at gmail.com> wrote:
>> I'm surprised that you are using "nor0". I wouldn't be surprised if
>> you are getting a null pointer or garbage dereference since you don't
>> have a driver that is using the nor subsystem, right?
>
> I thought that was the point of that experimental MTD translation
> layer driver.
> By enabling it and specifying "nor0=spiXXX.Y", it "does the right thing".
>
>> Chances are you need to add a spi flash type to mtdparts, reference
>> that, then hook it to the serial flash subsystem.

After a little more digging, I think you're right, Joe.
>From the u-boot README:

+               CONFIG_SPI_FLASH_MTD            spi-flash MTD layer
+
+               Define this option to use mtd support for spi flash layer, this
+               adapter is for translating mtd_read/mtd_write commands into
+               spi_flash_read/spi_flash_write commands. It is not intended to
+               use it within sf_cmd or the SPI flash subsystem. Such an adapter
+               is needed for subsystems like UBI which can only operate on top
+               of the MTD layer.

The experimental driver only translates low-level mtd_read/mtd_write
commands.  Doesn't look like it covers UBI yet.