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!