Hello Richard,
Am 02.02.2016 um 12:40 schrieb Richard Weinberger:
Am 02.02.2016 um 11:54 schrieb Heiko Schocher:
Set free_count to zero before walking through ai->erase list
in wl_init().
As U-Boot has no workqueue/threads, it immediately calls
erase_worker(), which increase for each erased block
free_count. Without this patch, free_count gets after
this initialized to zero in wl_init(), so the free_count
variable always has the maybe wrong value 0.
Detected this behaviour on the dxr2 board, where the
UBI fastmap gets not written when attaching/dettaching
on an empty NAND. It drops instead the error message:
could not find any anchor PEB
With this patch, fastmap gets written on dettach.
Signed-off-by: Heiko Schocher <h...@denx.de>
---
added Richard to this EMail, as maybe this could be a problem
in linux too ... ?
ubi_wl_init() is called by ubi_attach().
Yes, exactly, same for U-Boot.
So, as soon your UBI image is attached the WL subsystem
is fully initialized and ready to use.
If you try to use it before you're in undefined state.
u-boot must not run the erase_worker() before the attach
phase is done.
ubi_attach() in drivers/mtd/ubi/attach.c calls
ubi_wl_init() in drivers/mtd/ubi/wl.c. There schedule_erase() is
called, which calls schedule_ubi_work(). same for linux
and U-Boot ...
Now the U-Boot special:
In U-Boot we have no threads, so in U-Boot this "work" is done
immediately...
Which means in this case, that erase_worker() is executed immediately,
so before ubi_attach() finished ... but couldn;t it be that
with schedule_work(), the erase_work() couldn;t be exeucted before
ubi_attach() is finished?
Do you have more details what exactly happened?
This needs a deeper investigation.
I came into this errorcase if the nand flash is empty. Hmm... why
is there erase work? I try to find out more.
bye,
Heiko
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