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| author | Simon Glass <sjg@chromium.org> | 2015-03-03 08:03:00 -0700 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2015-03-04 14:55:04 -0500 |
| commit | db910353a126d84fe8dff7a694ea792f50fcfb6a (patch) | |
| tree | 0cca558754e992284820fbc240690c13d0a00cb0 /Kconfig | |
| parent | bdfb34167f73afc7e04d52499fc14bc1cd33fec0 (diff) | |
| download | u-boot-imx-db910353a126d84fe8dff7a694ea792f50fcfb6a.zip u-boot-imx-db910353a126d84fe8dff7a694ea792f50fcfb6a.tar.gz u-boot-imx-db910353a126d84fe8dff7a694ea792f50fcfb6a.tar.bz2 | |
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 <sjg@chromium.org>
For version 1:
Acked-by: Albert ARIBAUD <albert.u.boot@aribaud.net>
Reviewed-by: Stefan Roese <sr@denx.de>
Tested-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Bo Shen <voice.shen@atmel.com>
Acked-by: Heiko Schocher <hs@denx.de>
Tested-by: Heiko Schocher <hs@denx.de>
Signed-off-by: Tom Rini <trini@konsulko.com>
Diffstat (limited to 'Kconfig')
| -rw-r--r-- | Kconfig | 18 |
1 files changed, 18 insertions, 0 deletions
@@ -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 |