MCUmall EPROM BIOS Chip Burner Forum
MCUmall EPROM BIOS Chip Burner Forum
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10 Posts

Posted - 02/19/2015 :  16:28:14  Show Profile  Reply with Quote

I am trying to reuse 4 NAND chips (Samsung K9F4G08U0D).

2 were well erased and after blank check they were blank and I then reprogrammed them.

Instead, 2 of them get an error when I perform blank check:

"Flash is not blank at address 1C476000 ,target 00"

What does it mean, please?

Can these chips be reprogrammed, or are they bad?


Reply #1


104 Posts

Posted - 02/19/2015 :  21:13:16  Show Profile  Reply with Quote
Nand flashes often have bad sectors. So those sectors cannot be reprogrammed.
In OS they will mark them as bad sector and continue to use it. However as programmer it will not know the algorithm to bypass it
To proper way to use it is program the boot (u-boot) and then let the target to program itself. A pure clone will not work if the target has bad sectors.

GQ-5x can be used for backup or data recover purpose. If you want to use programmer to produce clone, then make sure the target has no bad sectors.
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Reply #2


10 Posts

Posted - 02/20/2015 :  11:51:49  Show Profile  Reply with Quote
Thanks for your reply!
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Reply #3


152 Posts

Posted - 06/25/2015 :  19:18:19  Show Profile  Reply with Quote
Hello you can explain the u-boot program. I have nand that are in good, but has sectors with zeros, and erase command that puts non ff
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