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Full Chip erased failed

What could be the problem that I'm not able to erase my chip by clicking Flash > erase?

If I select Erase Full Chip within the Flash Download Setup menue (options for target -> utilities) -> I'm not able to erase the chip or program the chip...

If I select Erase Sectors -> I'm able to erase and programm the chip...

I've an external Flash IC with 4MB.

Programming Algorithm
AT49xV32x Flash Ext. Flash 16Bit 4M 0x10000000 size 0x00400000

I use the AT91Rm9200 controller from Atmel.

Bernd

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