[U-Boot] problem with read only nanad

[alex889]

Hi,
I'm working on a system having 2 NAND chips,
the first one has the U-Boot and a basic firmware, and is read only,
and the second has a new firmware.
when the second chip is empty, the system should boot from the first chip.
but it gives me many errors, probably related to the fact that it's
readonly, 
does the u-boot tries to write something to the nand during startup?
how can i solve this issue?

thanks in advance
Alex
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