[U-Boot] [PATCH 04/12] sunxi: Update sunxi-common.h to deal with different DRAM base addr on sun9i

[Hans de Goede]

Hi,

On 17-01-15 23:44, Ian Campbell wrote:
> On Thu, 2015-01-15 at 15:52 +0100, Hans de Goede wrote:
>> The DRAM Base differs between sun9i and the others and we cannot use
>> math in various places like the environment setting and linker scripts,
>> so "simply" define everything which contains the SDRAM_BASE twice.
>
> Is it really not possible to use maths in linker scripts? How have I
> never noticed that...

I'm not 100% sure on that, I'm sure that it is not possible in the
environment stuff, so I thought lets play it safe and just write it
out fully for everything. I will drop the unconfirmed linker script
reference from the commit message for v2

>
> Anyway, given that things only differ in the most significant nibble of
> the RAM base address I think something like this might work:
>
> /* NB: find out if one of these is already available somewhere */
> #define __stringify(x) #x
> #define stringify(x) __stringify(x)
>
> #define SDRAM_OFFSET(x) 0x2##x /* or 0x4 */
> #define CONFIG_SYS_SDRAM_BASE SDRAM_OFFSET(0000000)
>
> #define MEM_LAYOUT_ENV_SETTINGS \
> 	"kernel_addr_r=" stringify(SDRAM_OFFSET(200000)) "\0"
>          ...

Yeah I think that will work. I'll do that for v2 (it may take a few
days before I get around to doing / posting a v2).

Regards,

Hans