[U-Boot] the weirdness with cmd_df.c

[Robert P. J. Day]

   i mentioned this this weekend as well, can someone clarify this?
the source file cmd_df.c looks weird:

U_BOOT_CMD(
         sf,     2,      1,      do_serial_flash,
         "Serial flash sub-system",
         "probe [bus:]cs         - init flash device on given SPI bus and CS")

so the source file "cmd_df.c" allegedly defines a command called "sf",  
which invokes "do_serial_flash", which isn't even defined in that  
source file -- what's defined in that file is "do_df".  i don't see  
"do_serial_flash" defined anywhere in the u-boot source tree.  am i  
just being blind?  i see no reference to that source file in Makefile,  
so i'm guessing it's historical cruft that could be deleted?

rday