[U-Boot] Can not erase first 2 sectors on flash

[Chen Wen]

Dear Sir:
Version:U-Boot 2010.06-rc2-00006-g28ccd77-dirty (Jun 24 2010 - 20:35:40)
(from git)
Flash:Flash Type: MXIC Flash MX29GL128E, per bank 128Mbits.

and...I do some test..

After u-boot enter main_loop, I can not write data to flash via trace32.

But I load my simple trace32 script, I can write data to flash via trace 32.
simple initial of trace32:
=========================================
 D.S DCR:0xF9 %LONG %BE 000000019       ; CPC0_PCI, PerWE, PAE
 D.S DCR:0xF6 %LONG %BE 0
 gosub IEBC "EBC0_B0AP"         0x10    007869200
 gosub IEBC "EBC0_B0CR"         0x00    0FF09A000   ; 16MB @FE000000
=========================================
When I verify the value of "EBC and CPC0_PCI" register.
u-boot and simple script fill the same value on "EBC and CPC0_PCI"

I am trying to find out what registers protect flash from writing.

And thank you that give much hints to me.


On Tue, Jun 15, 2010 at 3:54 PM, Detlev Zundel <dzu at denx.de> wrote:

> Hello Chen,
>
> > Thanks for your advice!!
> > When I try to erase across flash bank, I get error message before.
> > "Error: cannot span across banks when they are mapped in reverse order"
> >
> > Now I fix the order of banks.
> > And I can erase sector across flash bank now.
>
> Excellent.
>
> > But I still found that I can not erase first two sector.
>
> Ok, now I have to ask the ever-repeating questions - can you tell us
> more about the version of U-Boot you are using and the actual Flash chip
> that you use?  Maybe the flash chip has some kind of write protection
> feature which needs to be taken car of?
>
> Cheers
>  Detlev
>
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