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i386-Can't boot NetBSD with large MEMORY_DISK_ROOT_SIZE

I have built kernel with following options
options         MEMORY_DISK_HOOKS
options         MEMORY_DISK_IS_ROOT     
options         MEMORY_DISK_SERVER=1   
# 4M memory disk, in blocks
options         MEMORY_DISK_ROOT_SIZE=16384      # 8M memory disk, in blocks
options         MEMORY_RBFLAGS=0 

The boot process stops after some address display and PC reboots. If I change
options     MEMORY_DISK_ROOT_SIZE=8192 4M
ram disk kernel boots OK. Secondary boot is filing on pread() system call.
This problem don't exist on PPC. Is there any work aroud  this problem for
i385. Any hint!!!  

Regards Josip 

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