[U-Boot-Users] [PATCH/review] Blackfin: setup a sane default EBIU_SDBCTL for SDRAM controllers

[Mike Frysinger <vapier@gentoo.org>]

On Sunday 01 June 2008, Wolfgang Denk wrote:
> In message <1212298724-15152-8-git-send-email-vapier@gentoo.org> you wrote:
> > If the board config does not specify an explicit EBIU_SDBCTL value, set
> > it up with sane values based on other configuration options.
>
> ...
>
> > +#ifndef EBIU_RSTCTL
> > +/* Blackfin with SDRAM */
> > +#ifndef CONFIG_EBIU_SDBCTL_VAL
> > +# if CONFIG_MEM_SIZE == 16
> > +#  define CONFIG_EBSZ_VAL EBSZ_16
> > +# elif CONFIG_MEM_SIZE == 32
> > +#  define CONFIG_EBSZ_VAL EBSZ_32
> > +# elif CONFIG_MEM_SIZE == 64
> > +#  define CONFIG_EBSZ_VAL EBSZ_64
> > +# elif CONFIG_MEM_SIZE == 128
> > +#  define CONFIG_EBSZ_VAL EBSZ_128
> > +# elif CONFIG_MEM_SIZE == 256
> > +#  define CONFIG_EBSZ_VAL EBSZ_256
> > +# elif CONFIG_MEM_SIZE == 512
> > +#  define CONFIG_EBSZ_VAL EBSZ_512
> > +# else
> > +#  error You need to define CONFIG_EBIU_SDBCTL_VAL or CONFIG_MEM_SIZE
> > +# endif
> > +# if CONFIG_MEM_ADD_WDTH == 8
> > +#  define CONFIG_EBCAW_VAL EBCAW_8
> > +# elif CONFIG_MEM_ADD_WDTH == 9
> > +#  define CONFIG_EBCAW_VAL EBCAW_9
> > +# elif CONFIG_MEM_ADD_WDTH == 10
> > +#  define CONFIG_EBCAW_VAL EBCAW_10
> > +# elif CONFIG_MEM_ADD_WDTH == 11
> > +#  define CONFIG_EBCAW_VAL EBCAW_11
>
> This is pretty ugly code.

little cruft on the backend makes the lives of board porters a lot easier.

> Why do you need the numeric values for CONFIG_MEM_SIZE

because it gets used in many other places as a real value to create a large 
number of sane defaults.  the bitmask EBSZ_# would not be usable.

> and 
> CONFIG_MEM_ADD_WDTH at all? If you change for example
>
> 	#define CONFIG_MEM_ADD_WDTH       9
>
> in your board config file into
>
> 	#define CONFIG_MEM_ADD_WDTH       EBCAW_9
>
> this is barely less readable, but allow for much simpler code.

historically EBCAW_# did not exist.  i could make this transition, but then 
it'd be a little odd wrt CONFIG_MEM_SIZE being a straight number.  doesnt 
matter terribly much to me.
-mike
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