[U-Boot] why so little use of ft_system_setup()?

[Robert P. J. Day]

  still crawling through the code related to FDTs, and while i see a
pile of boards that define CONFIG_OF_SYSTEM_SETUP, i see very few that
define the corresponding(?) ft_system_setup() routine.

$ grep -r CONFIG_OF_SYSTEM_SETUP *
cmd/fdt.c:#ifdef CONFIG_OF_SYSTEM_SETUP
cmd/fdt.c:#ifdef CONFIG_OF_SYSTEM_SETUP
configs/apalis_t30_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/paz00_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/plutux_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/venice2_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/p2571_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/beaver_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/ventana_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/p2371-0000_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/tec-ng_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/seaboard_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/dalmore_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/harmony_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/cardhu_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/p2371-2180_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/trimslice_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/colibri_t30_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/colibri_t20_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/whistler_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/tec_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/jetson-tk1_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/e2220-1170_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/medcom-wide_defconfig:CONFIG_OF_SYSTEM_SETUP=y
configs/nyan-big_defconfig:CONFIG_OF_SYSTEM_SETUP=y
include/image.h:#ifdef CONFIG_OF_SYSTEM_SETUP
include/fdt_support.h: * This function is called if CONFIG_OF_SYSTEM_SETUP is defined
README:		CONFIG_OF_SYSTEM_SETUP
$

  and yet ...

$ grep -rw ft_system_setup *
arch/arm/mach-tegra/board2.c:int ft_system_setup(void *blob, bd_t *bd)
cmd/fdt.c:		int err = ft_system_setup(working_fdt, gd->bd);
common/image-fdt.c:		fdt_ret = ft_system_setup(blob, gd->bd);
include/fdt_support.h:int ft_system_setup(void *blob, bd_t *bd);
Kconfig:	  This causes U-Boot to call ft_system_setup() before booting into
README:		This causes ft_system_setup() to be called before booting
$

  am i missing something? what is the point of a board defining that
setting but not defining the associated(?) ft_system_setup() function?
what else is that CONFIG setting being used for? thanks.

rday

-- 

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Robert P. J. Day                                 Ottawa, Ontario, CANADA
                        http://crashcourse.ca

Twitter:                                       http://twitter.com/rpjday
LinkedIn:                               http://ca.linkedin.com/in/rpjday
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