[U-Boot] Non standard CFI detection tweaks

[Rogan Dawes <rogan@dawes.za.net>]

On 2010/07/19 12:49 PM, Stefan Roese wrote:
> Hi Rogan,
>
> On Monday 19 July 2010 12:18:45 Rogan Dawes wrote:
>>> How is your FLASH chip connected to your CPU? In 16bit wide mode (which
>>> is more common)?
>>
>> I have no idea. Do you have any suggestions how I can find out?
>
> I don't suppose you have the schematics for this board?

No, I'm afraid not.

>> If I do a normal md over the rest of the flash, I do see expected
>> strings from the U-Boot "partition", and the kernel and ramdisk
>> partitions. i.e. not duplicated or anything like that. Not sure if that
>> answers your question at all?
>
> No, it doesn't. But the unlocking addresses should give us the result (8bit
> vs. 16bit wide connection). What does work for you? The byte addresses or the
> word addresses (read manufacturer ID)?
>
> Byte addresses:
>
> =>  mw.b base + aaa aa
> =>  mw.b base + 555 55
> =>  mw.b base + aaa 90
> =>  md.b base

DNS323B1> mw.b 0xff800aaa aa
DNS323B1> mw.b 0xff800555 55
DNS323B1> mw.b 0xff800aaa 90
DNS323B1> md.b 0xff800000
ff800000: 7f 7f cb cb 00 00 08 08 7f 7f cb cb 00 00 08 08 
................
ff800010: 7f 7f cb cb 00 00 08 08 7f 7f cb cb 00 00 08 08 
................
ff800020: 7f 7f cb cb 00 00 08 08 7f 7f cb cb 00 00 08 08 
................
ff800030: 7f 7f cb cb 00 00 08 08 7f 7f cb cb 00 00 08 08 
................
DNS323B1> mw.b ff800000 f0
DNS323B1> mw.b ff800000 ff
DNS323B1> md.b 0xff800000
ff800000: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
ff800010: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
ff800020: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................
ff800030: 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 
................

> Word addresses:
>
> =>  mw.w base + 555 00aa
> =>  mw.w base + 2aa 0055
> =>  mw.w base + 555 0090
> =>  md.w base

This is quite odd, though.

DNS323B1> mw.w 0xff800555 00aa

... never returns. It seems to hang up the board for some reason.

> What's the output of those commands?
>
> Cheers,
> Stefan

Thanks for your help!