Robert points out that we have code selecting CRC32 but nothing that actually defines this config option. Similarly image.h #defines CONFIG_CRC32 but nothing tests for it.
lib/Makefile has had obj-y += crc32.o for some time. I can't find any evidence that u-boot ever had CONFIG_CRC32.
I suspect some of this may have come in when code has been imported from Linux (particularly the UBI/UBIFS code).
Chris Packham (4): cmd: ubifs: Remove select for non-existent option mtd: ubi: Remove select for non existent option Remove #define CONFIG_CRC32 Remove whitelist entry for CONFIG_CRC32
cmd/Kconfig | 2 -- drivers/mtd/ubi/Kconfig | 1 - include/image.h | 1 - scripts/config_whitelist.txt | 1 - 4 files changed, 5 deletions(-)