diff options
| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2010-03-18 09:07:08 -0500 |
|---|---|---|
| committer | Justin Waters <justin.waters@timesys.com> | 2010-12-13 16:09:20 -0500 |
| commit | 80f75b69316dc1e1df18b321708e7912681660cc (patch) | |
| tree | 13b15f67b197e710c94d9b9acea22e817eaa6d53 /arch/arm/include/asm | |
| parent | c4190676011b49ca8610fd8c4ab5398c4b33faa6 (diff) | |
Allow PHYS_OFFSET to be runtime determined
This bases on work done earlier by Lennert Buytenhek and Mark A. Greer.
Compared to their approach zreladdr isn't guessed based on the pc
register but the bootloader is expected to pass PHYS_OFFSET in r3. If
that value doesn't look right (e.g. isn't aligned) it is guessed based
on the value of sp. This should work for CONFIG_ZBOOT_ROM, too.
To use it for your machine removing the definition of PHYS_OFFSET from
<mach/memory.h> and selecting CONFIG_RUNTIME_PHYS_OFFSET should be
enough.
Cc: Lennert Buytenhek <buytenh@wantstofly.org>
Cc: Steve Chen <schen@mvista.com>
Cc: Mark A. Greer <mgreer@mvista.com>
Cc: Kevin Hilman <khilman@deeprootsystems.com>
Signed-off-by: Uwe Kleine-König <u.kleine-koenig@pengutronix.de>
Diffstat (limited to 'arch/arm/include/asm')
| -rw-r--r-- | arch/arm/include/asm/memory.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h index 4312ee5e3d0b..05a7a3f22f26 100644 --- a/arch/arm/include/asm/memory.h +++ b/arch/arm/include/asm/memory.h @@ -24,6 +24,11 @@ */ #define UL(x) _AC(x, UL) +#if defined(CONFIG_RUNTIME_PHYS_OFFSET) && !defined(__ASSEMBLY__) +extern unsigned long phys_offset; +#define PHYS_OFFSET phys_offset +#endif + #ifdef CONFIG_MMU /* |