On Wed, Sep 16, 2009 at 11:55:12PM +0800, Bin Meng wrote:
On Wed, Sep 16, 2009 at 5:40 AM, duckycool duckycool@gmail.com wrote:
Correction, the nand flash is K9F8G08U0M.
K9F8G08U0M is a 4KB page size NAND flash. Freescale eLBC NAND flash controller does not support 4KB page size.
MPC8544 doesn't have eLBC, so its LBC can't speak NAND directly, only via UPM (user-programmable machine). And with UPM we can support any NAND flashes.
As for the original problem, it could be anything: schematics (I assume it's custom 8544 board), timings setup (OR/BR), or UPM array problem.
Unfortunately it's hard to debug these sort of things without logic analyzer, so if you don't have one, I'd suggest to play 'trial & error' game.
Cc'ing Wolfgang Grandegger though, maybe he has better ideas.