[U-Boot] FAT filesystem support on SPI flash

[Tom Rini]

On Sun, Feb 23, 2014 at 01:37:53PM +0000, Vasili Galka wrote:
> Hi,
> 	
> On our system, we are interested in keeping all files, including the
> OS image and U-Boot second stage on FAT filesystem residing on a SPI
> flash.
> 
> I have not found existing U-Boot support for such functionality. Have
> I missed it?
> 
> In any case, I'm willing to implement this, do you see it reasonable
> incorporating such code into U-Boot? (if it passes review of course)
> 
> I note about design: As our chip (TI's AM335x) does not support direct
> boot from FAT stored on SPI, I plan reserving section at the beginning
> of SPI flash for the first stage boot loader and having the filesystem
> after it.

The high level suggestion is to review your design decision as this
seems rather questionable.  Today our FAT code doesn't work directly on
flash, but I imagine a day or two of hacking might allow it to work.
But FAT isn't designed to be on flash directly and you really want a
good reason to not be using a flash filesystem on SPI.

-- 
Tom
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