Hi Ian,
On 01/17/2015 11:44 PM, 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...
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"
...
I've finally brushed of these patches and I'm working on cleaning them
up now.
Unfortunately a lot of the CONFIG_xxx variables with dram base
address derived values get exported through cpp -E -dM which does
not do macro expansion, and then used in Makefiles to pass to the
linker and such. So I've been unable to get big of the
#ifdef ... #else ... #endif block setting various defines for this.
I've been able to make the environment block use the trick you
suggested, so this does give a nice cleanup.
Regards,
Hans
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