[U-Boot] [PATCH 2/2] mpc5200, digsy_mtc: add support for rev5 board version

[Stefan Roese]

Hi Wolfgang & Heiko,

On Wednesday 12 January 2011 08:59:20 Wolfgang Denk wrote:
> > diff --git a/doc/README.cfi b/doc/README.cfi
> > new file mode 100644
> > index 0000000..fa35108
> > --- /dev/null
> > +++ b/doc/README.cfi
> > @@ -0,0 +1,15 @@
> > +known issues:
> > +
> > +using M29W128GH from Numonyx:
> > +
> > +You need to add a board specific flash_cmd_reset() function
> > +for this chip to work correctly. Something like this should
> > +work (tested on the digsy_mtc board):
> > +
> > +void flash_cmd_reset(flash_info_t *info)
> > +{
> > +        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
> > +}
> 
> Stefan, can you please send an explicit ACK for this part?

If we put something like this into this new README, we should make the 
description a bit better. Something like:

--- <snip> ---
The common CFI driver provides this weak default implementation for 
flash_cmd_reset():

void __flash_cmd_reset(flash_info_t *info)
{
        /*
         * We do not yet know what kind of commandset to use, so we issue
         * the reset command in both Intel and AMD variants, in the hope
         * that AMD flash roms ignore the Intel command.
         */
        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
        flash_write_cmd(info, 0, 0, FLASH_CMD_RESET);
}
void flash_cmd_reset(flash_info_t *info)
        __attribute__((weak,alias("__flash_cmd_reset")));


Some flash chips seems to have trouble with this reset sequence. In this case 
the board specific code can override this weak default version with a board 
specific function. For example the digsy_mtc board equipped with the M29W128GH 
from Numonyx needs this version to function properly:

void flash_cmd_reset(flash_info_t *info)
{
        flash_write_cmd(info, 0, 0, AMD_CMD_RESET);
}
--- <snip> ---


Heiko, if nobody objects then please include this version into your next patch 
version. Here my:

Signed-off-by: Stefan Roese <sr at denx.de>

Thanks.

Cheers,
Stefan

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