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spl: Allow performing BSS init early before board_init_f()

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On some platform we have sufficient memory available early on to allow
setting up and using a basic BSS prior to entering board_init_f(). Doing
so can for example be used to carry state over to board_init_r() without
having to resort to extending U-Boot's global data structure.

To support such scenarios add a Kconfig option called CONFIG_SPL_EARLY_BSS
to allow moving the initialization of BSS prior to entering board_init_f(),
if enabled. Note that using this option usually should go along with using
CONFIG_SPL_SEPARATE_BSS and configuring BSS to be located in memory
actually available prior to board_init_f().

Signed-off-by: Andreas Dannenberg <dannenberg@ti.com>
This commit is contained in:
Andreas Dannenberg
2019-06-04 17:55:45 -05:00
committed by Tom Rini
parent 70942db4dd
commit a5a5d997b4
2 changed files with 46 additions and 17 deletions
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10
common/spl/Kconfig
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@@ -248,6 +248,16 @@ config TPL_BANNER_PRINT
info. Disabling this option could be useful to reduce SPL boot time
(e.g. approx. 6 ms faster, when output on i.MX6 with 115200 baud).
config SPL_EARLY_BSS
depends on ARM && !ARM64
bool "Allows initializing BSS early before entering board_init_f"
help
On some platform we have sufficient memory available early on to
allow setting up and using a basic BSS prior to entering
board_init_f. Activating this option will also de-activate the
clearing of BSS during the SPL relocation process, thus allowing
to carry state from board_init_f to board_init_r by way of BSS.
config SPL_DISPLAY_PRINT
bool "Display a board-specific message in SPL"
help