some time ago, i wrote some simple shell scripts that scanned the kernel source tree and identified oddities in configuration files -- things like Kconfig variables that were defined but never used, macros that were being tested but were never set, etc. i just tweaked one of those scripts to scan the u-boot tree to locate CONFIG_CMD_* variables that were being tested, but weren't "#defined" anywhere. nothing wrong with that, most of them are still documented and i've added at the bottom the fairly short output of those u-boot variables as well as their occurrence in the tree.

they fall into three categories, with examples. here's one where there's no #define, but the variable is at least documented so no problem:

===== CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST README: CONFIG_CMD_DS4510_RST * ds4510 I2C rst command

here's one where there's no #define, and apparently no documentation anywhere:

===== CONFIG_CMD_NAND_YAFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_YAFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_YAFFS drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_YAFFS drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_YAFFS include/configs/M54418TWR.h:#undef CONFIG_CMD_NAND_YAFFS

finally, here's a case that looks like a reference to a command that was never added and thus represents pointless code:

===== CONFIG_CMD_FUSE arch/powerpc/cpu/mpc512x/iim.c:#ifdef CONFIG_CMD_FUSE arch/powerpc/cpu/mpc512x/iim.c:#endif /* CONFIG_CMD_FUSE */ board/esd/mecp5123/mecp5123.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/pdm360ng/pdm360ng.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/davedenx/aria/aria.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/freescale/mpc5121ads/mpc5121ads.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) include/configs/mecp5123.h:#undef CONFIG_CMD_FUSE include/configs/aria.h:#undef CONFIG_CMD_FUSE include/configs/mpc5121ads.h:#undef CONFIG_CMD_FUSE

here's the full list -- not all that long:

===== CONFIG_CMD_DS4510_MEM drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_MEM drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_MEM drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_MEM drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_MEM drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_MEM README: CONFIG_CMD_DS4510_MEM * ds4510 I2C eeprom/sram commansd ===== CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST drivers/misc/ds4510.c:#ifdef CONFIG_CMD_DS4510_RST README: CONFIG_CMD_DS4510_RST * ds4510 I2C rst command ===== CONFIG_CMD_ENV_CALLBACK common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_CALLBACK) common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_CALLBACK) common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_CALLBACK) README: CONFIG_CMD_ENV_CALLBACK * display details about env callbacks ===== CONFIG_CMD_ENV_FLAGS common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_FLAGS) common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_FLAGS) common/cmd_nvedit.c:#if defined(CONFIG_CMD_ENV_FLAGS) common/env_flags.c:#ifdef CONFIG_CMD_ENV_FLAGS common/env_flags.c:#endif /* CONFIG_CMD_ENV_FLAGS */ include/env_flags.h:#ifdef CONFIG_CMD_ENV_FLAGS README: CONFIG_CMD_ENV_FLAGS * display details about env flags ===== CONFIG_CMD_FUSE arch/powerpc/cpu/mpc512x/iim.c:#ifdef CONFIG_CMD_FUSE arch/powerpc/cpu/mpc512x/iim.c:#endif /* CONFIG_CMD_FUSE */ board/esd/mecp5123/mecp5123.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/pdm360ng/pdm360ng.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/davedenx/aria/aria.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) board/freescale/mpc5121ads/mpc5121ads.c:#if defined(CONFIG_IIM) || defined(CONFIG_CMD_FUSE) include/configs/mecp5123.h:#undef CONFIG_CMD_FUSE include/configs/aria.h:#undef CONFIG_CMD_FUSE include/configs/mpc5121ads.h:#undef CONFIG_CMD_FUSE ===== CONFIG_CMD_LINK_LOCAL common/cmd_net.c:#if defined(CONFIG_CMD_LINK_LOCAL) common/cmd_net.c:#endif /* CONFIG_CMD_LINK_LOCAL */ doc/README.link-local:When CONFIG_CMD_LINK_LOCAL is defined in the board config file, doc/README.link-local:by env variables. It depends on CONFIG_CMD_LINK_LOCAL, CONFIG_CMD_DHCP, include/config_uncmd_spl.h:#undef CONFIG_CMD_LINK_LOCAL include/common.h: defined(CONFIG_CMD_LINK_LOCAL) lib/Makefile:COBJS-$(CONFIG_CMD_LINK_LOCAL) += rand.o net/arp.c:#ifdef CONFIG_CMD_LINK_LOCAL net/net.c:#if defined(CONFIG_CMD_LINK_LOCAL) net/link_local.h:#if defined(CONFIG_CMD_LINK_LOCAL) net/Makefile:COBJS-$(CONFIG_CMD_LINK_LOCAL) += link_local.o README: CONFIG_CMD_LINK_LOCAL * link-local IP address auto-configuration ===== CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) common/cmd_mtdparts.c:#else /* !defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) */ common/cmd_mtdparts.c:#endif /* defined(CONFIG_CMD_MTDPARTS_SHOW_NET_SIZES) */ ===== CONFIG_CMD_MTDPARTS_SPREAD common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#endif /* CONFIG_CMD_MTDPARTS_SPREAD */ common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#endif /* CONFIG_CMD_MTDPARTS_SPREAD */ common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) common/cmd_mtdparts.c:#endif /* CONFIG_CMD_MTDPARTS_SPREAD */ drivers/mtd/mtdcore.c:#if defined(CONFIG_CMD_MTDPARTS_SPREAD) drivers/mtd/mtdcore.c:#endif /* defined(CONFIG_CMD_MTDPARTS_SPREAD) */ ===== CONFIG_CMD_NAND_TORTURE common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_TORTURE common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_TORTURE doc/README.nand: CONFIG_CMD_NAND_TORTURE doc/README.nand: Enabled by the CONFIG_CMD_NAND_TORTURE configuration option. drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_TORTURE ===== CONFIG_CMD_NAND_TRIMFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_TRIMFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_TRIMFFS doc/README.nand: Enabled by the CONFIG_CMD_NAND_TRIMFFS macro. This command will write to drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_TRIMFFS drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_TRIMFFS ===== CONFIG_CMD_NAND_YAFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_YAFFS common/cmd_nand.c:#ifdef CONFIG_CMD_NAND_YAFFS drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_YAFFS drivers/mtd/nand/nand_util.c:#ifdef CONFIG_CMD_NAND_YAFFS include/configs/M54418TWR.h:#undef CONFIG_CMD_NAND_YAFFS ===== CONFIG_CMD_SF_TEST common/cmd_sf.c:#ifdef CONFIG_CMD_SF_TEST common/cmd_sf.c:#endif /* CONFIG_CMD_SF_TEST */ common/cmd_sf.c:#ifdef CONFIG_CMD_SF_TEST common/cmd_sf.c:#ifdef CONFIG_CMD_SF_TEST README: CONFIG_CMD_SF_TEST ===== CONFIG_CMD_TFTPSRV common/cmd_net.c:#ifdef CONFIG_CMD_TFTPSRV include/config_uncmd_spl.h:#undef CONFIG_CMD_TFTPSRV net/tftp.c:#ifdef CONFIG_CMD_TFTPSRV net/tftp.c:#ifdef CONFIG_CMD_TFTPSRV net/tftp.c:#endif /* CONFIG_CMD_TFTPSRV */ net/net.c:#ifdef CONFIG_CMD_TFTPSRV net/tftp.h:#ifdef CONFIG_CMD_TFTPSRV README: CONFIG_CMD_TFTPSRV * TFTP transfer in server mode ===== CONFIG_CMD_TIMER common/cmd_misc.c:#ifdef CONFIG_CMD_TIMER README: CONFIG_CMD_TIMER * access to the system tick timer

rday