This introduces a new Kconfig option SPL_CLEAR_BSS_F. If enabled, it clears the bss before calling board_init_f() instead of clearing it before calling board_init_r().
This also ensures that variables placed in BSS can be shared between board_init_f() and board_init_r() in SPL.
Such global variables are used, for example, when loading things from FAT before SDRAM is available: the full heap required for FAT uses global variables and clearing BSS after board_init_f() would reset the heap state. An example for such a usage is socfpa_arria10 where an FPGA configuration is required before SDRAM can be used.
Make the new option depend on ARM for now until more implementations follow.
Signed-off-by: Simon Goldschmidt simon.k.r.goldschmidt@gmail.com ---
Changes in v3: - improve commit message to show why CONFIG_CLEAR_BSS_F is needed
Changes in v2: - make CONFIG_SPL_CLEAR_BSS_F depend on ARM for now
common/spl/Kconfig | 12 ++++++++++++ 1 file changed, 12 insertions(+)
diff --git a/common/spl/Kconfig b/common/spl/Kconfig index 206c24076d..6a4270516a 100644 --- a/common/spl/Kconfig +++ b/common/spl/Kconfig @@ -156,6 +156,18 @@ config SPL_STACK_R_MALLOC_SIMPLE_LEN to give board_init_r() a larger heap then the initial heap in SRAM which is limited to SYS_MALLOC_F_LEN bytes.
+config SPL_CLEAR_BSS_F + bool "Clear BSS section before calling board_init_f" + depends on ARM + help + The BSS section is initialized to zero. In SPL, this is normally done + before calling board_init_r(). + For platforms using BSS in board_init_f() already, enable this to + clear the BSS section before calling board_init_f() instead of + clearing it before calling board_init_r(). This also ensures that + variables placed in BSS can be shared between board_init_f() and + board_init_r(). + config SPL_SEPARATE_BSS bool "BSS section is in a different memory region from text" help