CFI with 4 x8/x16 devices on a 32-bit bus

[David Woodhouse]

BrettC at nulec.com.au said:
> My take on the datasheet is that when in byte mode, A-1 becomes the
> LSB of the address.

OK,... looking at the (AM29LV320D) datasheet again, I see that. 

> The unlock 2 address in word mode is 0x2AA (8 bits set to 1) and byte mode
> is 0x555 (9 bits set to 1).

Ah, yes - I see that too. I find it very concerning that the datasheet is 
clearer to me at 2:30 in the morning than at any other time. 

OK.... how about fixing it up in the probe code to appear as an 8-bit 
device, and setting the unlock[12] addresses accordingly?

If we detect it's a 16-bit device in 8-bit mode, do...

 cfi->device_type = 1;
 cfi->addr_unlock1 = 0xaaa;
 cfi->addr_unlock2 = 0x555;

Does that work?

--
dwmw2




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