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"yaffs tragedy" after applying write protect pin

Hello.

After I set WP ON in my DM368 NAND based board (which worked perfect previously), I received a lot of messages like:

yaffs tragedy: no more eraased blocks
!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
yaffs tragedy: no more eraased blocks
!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
yaffs tragedy: no more eraased blocks
!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
yaffs tragedy: no more eraased blocks
!!!!!!!!! Allocator out !!!!!!!!!!!!!!!!!
...........
---
I also noted one message like this:

FATAL: Could not open /lib/modules/2.6.18_pro500-davinci_evm-arm_v5t_le/modules.dep.temp for writing: Cannot allocate memory

HAs somebody encountered something similar?
What can be done i this case?

Many thanks ahead.