Hi!

FreeWRT is working on support for Mikrotik's RouterBoard532, which
has a large page NAND flash chip. To improve bootup time, Mikrotik
developers decided to partition the flash into two parts, the first one
just holding the kernel, and therefore only being 4MB of size.
Unfortunately, this makes problems with checkpointing, as the default of
10 Blocks already covers half of the free space in the filesystem. 

To solve this in a clean way, I exported the reserved blocks count into
the kernel configuration. But see yourself, patch is appended.

I would be very happy if this patch makes it into upstream. I could also
imagine having another option to totally disable checkpoints. If there
is anything I can do to satisfy your expectations on the configuration
possibilities for checkpointing, just tell me and I will send you an
adjusted version of the patch.

Thanks in advance, Phil