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.goldschm...@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
--
2.17.1
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