[U-Boot] JFFS2-Summary support for u-boot

[Joakim Tjernlund]

On Mon, 2008-09-29 at 11:34 +0000, Michael Lawnick wrote:
> Joakim Tjernlund <joakim.tjernlund <at> transmode.se> writes:
> 
> > 
> > On Mon, 2008-09-29 at 08:45 +0000, Michael Lawnick wrote:
> > > Hi *,
> > > 
> > > please feel free to correct me if I tell sh**:
> > > As far as I was told, bad JFFS2 boot performance of u-boot is result of not
> > > supporting summary. (Because there is no JFFS2 but only JFFS support?)
> > 
> > It is not missing SUMMARY, it is excessive scanning of empty flash
> > blocks. Look at jffs2/scan.c, it only scan the first 4KB or before
> > declaring the block empty.
> 
> Ok, did I get you correct:
> The performance difference between u-boot and linux is based on skipping
> senseless scans of empty blocks?
> I've taken a little look into scan.c
> The comment "The code lacks more or less any comment, and is still arcane and
> difficult to read in places." doesn't make me happy.
> 
> Has anybody tried to (and succeeded in) speed up u-boot?

Yes, there was an attempt some time ago(months or a year, dunno) where
someone had improved scanning dramatically, patch was posted to the
u-boot list. Can't remember who though.

 Jocke