From db910353a126d84fe8dff7a694ea792f50fcfb6a Mon Sep 17 00:00:00 2001 From: Simon Glass Date: Tue, 3 Mar 2015 08:03:00 -0700 Subject: 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 For version 1: Acked-by: Albert ARIBAUD Reviewed-by: Stefan Roese Tested-by: Bo Shen Acked-by: Bo Shen Acked-by: Heiko Schocher Tested-by: Heiko Schocher Signed-off-by: Tom Rini --- Kconfig | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) (limited to 'Kconfig') diff --git a/Kconfig b/Kconfig index 91a0618..b879461 100644 --- a/Kconfig +++ b/Kconfig @@ -96,6 +96,24 @@ config SPL help If you want to build SPL as well as the normal image, say Y. +config SPL_STACK_R + depends on SPL + bool "Enable SDRAM location for SPL stack" + help + 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. + +config SPL_STACK_R_ADDR + depends on SPL_STACK_R + hex "SDRAM location for SPL stack" + help + Specify the address in SDRAM for the SPL stack. This will be set up + before board_init_r() is called. + config TPL bool depends on SPL && SUPPORT_TPL -- cgit v1.1