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| author | Uwe Kleine-König <u.kleine-koenig@pengutronix.de> | 2010-03-18 09:07:08 -0500 |
|---|---|---|
| committer | Alejandro Gonzalez <alex.gonzalez@digi.com> | 2010-05-25 11:20:14 +0200 |
| commit | 8513c72819be22b22d044424eff0fd4183ea8ca2 (patch) | |
| tree | 61ec023cba96fabbb23e1bf6d4ff9c68d54c6ac3 /arch/arm/Kconfig | |
| parent | 73f8a055cfa54399eb612964301b2e06f5aa3e16 (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>
Signed-off-by: Alejandro Gonzalez <alex.gonzalez@digi.com>
Diffstat (limited to 'arch/arm/Kconfig')
| -rw-r--r-- | arch/arm/Kconfig | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/arch/arm/Kconfig b/arch/arm/Kconfig index 62ec97f5928c..fa492c2e051a 100644 --- a/arch/arm/Kconfig +++ b/arch/arm/Kconfig @@ -1166,6 +1166,9 @@ config UACCESS_WITH_MEMCPY However, if the CPU data cache is using a write-allocate mode, this option is unlikely to provide any performance gain. +config RUNTIME_PHYS_OFFSET + bool + endmenu menu "Boot options" |