From mboxrd@z Thu Jan  1 00:00:00 1970
From: Ferry Toth <fntoth@gmail.com>
Date: Fri, 13 Nov 2020 23:53:26 +0100
Subject: CONFIG: btrfs requires sha256
Message-ID: <ron2p6$13a5$1@ciao.gmane.io>
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In v2021.01-rc2 enabling CONFIG_FS_BTRFS=y produces:

x86_64-poky-linux-ld.bfd: fs/built-in.o: in function `hash_sha256':
     u-boot/1_2021.01-rc2-r0/git/fs/btrfs/crypto/hash.c:25: undefined 
reference to `sha256_starts'
x86_64-poky-linux-ld.bfd: 
u-boot/1_2021.01-rc2-r0/git/fs/btrfs/crypto/hash.c:26: undefined 
reference to `sha256_update'
x86_64-poky-linux-ld.bfd: 
u-boot/1_2021.01-rc2-r0/git/fs/btrfs/crypto/hash.c:27: undefined 
reference to `sha256_finish'

Enabling CONFIG_SHA256=y resolves this, however it is not a dependency.