From a5a5d997b41a1b63eed67e78fac1d015e3e070e2 Mon Sep 17 00:00:00 2001 From: Andreas Dannenberg Date: Tue, 4 Jun 2019 17:55:45 -0500 Subject: spl: Allow performing BSS init early before board_init_f() 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 --- common/spl/Kconfig | 10 ++++++++++ 1 file changed, 10 insertions(+) (limited to 'common/spl/Kconfig') diff --git a/common/spl/Kconfig b/common/spl/Kconfig index 7122c069b2..5978fb2934 100644 --- a/common/spl/Kconfig +++ b/common/spl/Kconfig @@ -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 -- cgit v1.2.1