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write in a flash 4xx processor

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Bondy

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hello. i have a board with a ibm ppc processor 4xx and a flash amd160lv, and i have
acess to read this memory using a simple jtag and de flash programer by Mcgraigor systems
My problem is write in a flash!!
In the datasheet of the ep405pc on table 7.3 i see this


2 R/WGFWP 0 = local FLASH is write protected
1 = local FLASH is not write protected

so if you see the datasheet i need to change the second bit on adress of de bcsr2 register
for write a .s19 on the flash, so i need help.
Anyway a need to find the register in a datasheet who protect de checksun verificacion.

tanks
 

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