|author||Simon Glass <firstname.lastname@example.org>||2015-03-03 08:03:00 -0700|
|committer||Tom Rini <email@example.com>||2015-03-04 14:55:04 -0500|
arm: spl: Allow board_init_r() to run with a larger stack
At present SPL uses a single stack, either CONFIG_SPL_STACK or CONFIG_SYS_INIT_SP_ADDR. Since some SPL features (such as MMC and environment) require a lot of stack, some boards set CONFIG_SPL_STACK to point into SDRAM. They then set up SDRAM very early, before board_init_f(), so that the larger stack can be used. This is an abuse of lowlevel_init(). That function should only be used for essential start-up code which cannot be delayed. An example of a valid use is when only part of the SPL code is visible/executable, and the SoC must be set up so that board_init_f() can be reached. It should not be used for SDRAM init, console init, etc. Add a CONFIG_SPL_STACK_R option, which allows the stack to be moved to a new address before board_init_r() is called in SPL. The expected SPL flow (for CONFIG_SPL_FRAMEWORK) is documented in the README. Signed-off-by: Simon Glass <firstname.lastname@example.org> For version 1: Acked-by: Albert ARIBAUD <email@example.com> Reviewed-by: Stefan Roese <firstname.lastname@example.org> Tested-by: Bo Shen <email@example.com> Acked-by: Bo Shen <firstname.lastname@example.org> Acked-by: Heiko Schocher <email@example.com> Tested-by: Heiko Schocher <firstname.lastname@example.org> Signed-off-by: Tom Rini <email@example.com>
Diffstat (limited to 'Kconfig')
1 files changed, 18 insertions, 0 deletions
@@ -96,6 +96,24 @@ config SPL
If you want to build SPL as well as the normal image, say Y.
+ depends on SPL
+ bool "Enable SDRAM location for SPL stack"
+ SPL starts off execution in SRAM and thus typically has only a small
+ stack available. Since SPL sets up DRAM while in its board_init_f()
+ function, it is possible for the stack to move there before
+ board_init_r() is reached. This option enables a special SDRAM
+ location for the SPL stack. U-Boot SPL switches to this after
+ board_init_f() completes, and before board_init_r() starts.
+ depends on SPL_STACK_R
+ hex "SDRAM location for SPL stack"
+ Specify the address in SDRAM for the SPL stack. This will be set up
+ before board_init_r() is called.
depends on SPL && SUPPORT_TPL