I do not have a datasheet, but, if I'm not wrong, using r2 on vendor bios of d945gclf (supported board), it seems making a test before writing :
MEMORY[0xFED14F08] |= 0x6000u;
MEMORY[0xFED14F0A] |= 0x6000u;
MEMORY[0xFED14F0C] |= 0x6000u;

Patch set 1:Code-Review -1

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