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board_f: Add new function to allow runtime DTB selection

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Runtime U-boot dtb selection is generally a two step process. First step
is to simply use an initial generic dtb. The second step is to select
the dtb and perhaps execute additional code ones U-boot knows what board
it is running on. Embedded_dtb_select handles the second step by allowing
board specific code to run and perform what ever necessary configuration
that is needed.

Signed-off-by: Franklin S Cooper Jr <fcooper@ti.com>
Reviewed-by: Tom Rini <trini@konsulko.com>
This commit is contained in:
Cooper Jr., Franklin 2017-06-16 17:25:12 -05:00 committed by Tom Rini
parent 80364a42c1
commit af9e6ad4ab
3 changed files with 16 additions and 0 deletions
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9
common/Kconfig
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@ -437,6 +437,15 @@ config SYS_STDIO_DEREGISTER
endmenu
config DTB_RESELECT
bool "Support swapping dtbs at a later point in boot"
depends on FIT_EMBED
help
It is possible during initial boot you may need to use a generic
dtb until you can fully determine the board your running on. This
config allows boards to implement a function at a later point
during boot to switch to the "correct" dtb.
config FIT_EMBED
bool "Support a FIT image embedded in the U-boot image"
help

3
common/board_f.c
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@ -809,6 +809,9 @@ static const init_fnc_t init_sequence_f[] = {
#if defined(CONFIG_DISPLAY_CPUINFO)
print_cpuinfo, /* display cpu info (and speed) */
#endif
#if defined(CONFIG_DTB_RESELECT)
embedded_dtb_select,
#endif
#if defined(CONFIG_DISPLAY_BOARDINFO)
show_board_info,
#endif

4
include/common.h
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@ -359,6 +359,10 @@ int get_env_id (void);
void pci_init (void);
void pci_init_board(void);
#if defined(CONFIG_DTB_RESELECT)
int embedded_dtb_select(void);
#endif
int misc_init_f (void);
int misc_init_r (void);