[U-Boot] Query: Does Uboot support CFI flash driver forM29W128GH

[prakash bedge]

Hi Stefan,

Thanks for information.

Can you please send me the patch details to fixup the CFI query related bug
for M29W128GH?

In the code for each header file there is a macro named
CONFIG_FLASH_CFI_DRIVER defined in each board specific header file in folder
/include/configs. But I am not seeing any #ifdef for this macro in code.
Where this macro is being checked in the code?

Is there any documentation giving details on how the CFI flash
driver executes in U-Boot?
Please share the document if you have.


Thanks & Regards,
Prakash

On Wed, Oct 28, 2009 at 1:38 PM, Stefan Roese <sr at denx.de> wrote:

> Hi Prakash,
>
> On Wednesday 28 October 2009 07:23:31 prakash bedge wrote:
> > Thanks. I have seen that patch work and I will try it and hope it will
> work
> > for M29W128GH (ST make).
> >
> > But why I am not seeing the chip name and any instance of M29W128GH in
> >  Uboot source code?
> > Is it because the chip is CFI compliant?
>
> Yes. For CFI compliant chips features like sector count, sector sizes etc
> are
> autodetected. No need to define the chip with it's ID anywhere.
>
> > How I can crosscheck that present Uboot V2009.08 works for M29W128GH?
> Which
> > folder I should check for that?
> > I believe the Patch sent by you will work in this version.
>
> You should test it with the latest version of mainline U-Boot:
>
> http://git.denx.de/?p=u-boot.git;a=summary
>
> Please note that you need to add a board specific flash_cmd_reset()
> function
> for this chip to work correctly. Something like this should work
> (untested):
>
> void flash_cmd_reset(flash_info_t *info)
> {
>        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
>  }
>
> Cheers,
> Stefan
>
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